diff --git a/packages/@jsii/spec/lib/assembly.ts b/packages/@jsii/spec/lib/assembly.ts
index d3c21db5fc..779fff7d16 100644
--- a/packages/@jsii/spec/lib/assembly.ts
+++ b/packages/@jsii/spec/lib/assembly.ts
@@ -3,7 +3,7 @@ export const SPEC_FILE_NAME = '.jsii';
 /**
  * A JSII assembly specification.
  */
-export interface Assembly extends Documentable {
+export interface Assembly extends AssemblyConfiguration, Documentable {
   /**
    * The version of the spec schema
    */
@@ -88,14 +88,6 @@ export interface Assembly extends Documentable {
    */
   license: string;
 
-  /**
-   * A map of target name to configuration, which is used when generating
-   * packages for various languages.
-   *
-   * @default none
-   */
-  targets?: AssemblyTargets;
-
   /**
    * Arbitrary key-value pairs of metadata, which the maintainer chose to
    * document with the assembly. These entries do not carry normative
@@ -115,18 +107,20 @@ export interface Assembly extends Documentable {
 
   /**
    * Direct dependencies on other assemblies (with semver), the key is the JSII
-   * assembly name.
+   * assembly name, and the value is a SemVer expression..
    *
    * @default none
    */
-  dependencies?: { [assembly: string]: PackageVersion };
+  dependencies?: { [assembly: string]: string };
 
   /**
-   * Closure of all dependency assemblies, direct and transitive.
+   * Target configuration for all the assemblies that are direct or transitive
+   * dependencies of this assembly. This is needed to generate correct native
+   * type names for any transitively inherited member, in certain languages.
    *
    * @default none
    */
-  dependencyClosure?: { [assembly: string]: PackageVersion };
+  dependencyClosure?: { [assembly: string]: AssemblyConfiguration };
 
   /**
    * List if bundled dependencies (these are not expected to be jsii
@@ -151,6 +145,19 @@ export interface Assembly extends Documentable {
   readme?: { markdown: string };
 }
 
+/**
+ * Shareable configuration of a jsii Assembly.
+ */
+export interface AssemblyConfiguration {
+  /**
+   * A map of target name to configuration, which is used when generating
+   * packages for various languages.
+   *
+   * @default none
+   */
+  targets?: AssemblyTargets;
+}
+
 /**
  * Versions of the JSII Assembly Specification.
  */
@@ -214,25 +221,6 @@ export interface AssemblyTargets {
   [language: string]: { [key: string]: any } | undefined;
 }
 
-/**
- * The version of a package.
- */
-export interface PackageVersion {
-  /**
-   * Version of the package.
-   *
-   * @minLength 1
-   */
-  version: string;
-
-  /**
-   * Targets for a given assembly.
-   *
-   * @default none
-   */
-  targets?: AssemblyTargets;
-}
-
 /**
  * Where in the module source the definition for this API item was found
  */
diff --git a/packages/@jsii/spec/lib/index.ts b/packages/@jsii/spec/lib/index.ts
index 27644b56f8..4b318ab612 100644
--- a/packages/@jsii/spec/lib/index.ts
+++ b/packages/@jsii/spec/lib/index.ts
@@ -1,4 +1,4 @@
 export * from './assembly';
+export * from './configuration';
 export * from './name-tree';
 export * from './validate-assembly';
-export * from './configuration';
diff --git a/packages/@scope/jsii-calc-base/package.json b/packages/@scope/jsii-calc-base/package.json
index 9f2c1dc38b..5ed761195a 100644
--- a/packages/@scope/jsii-calc-base/package.json
+++ b/packages/@scope/jsii-calc-base/package.json
@@ -29,10 +29,10 @@
     "test:update": "npm run build && UPDATE_DIFF=1 npm run test"
   },
   "dependencies": {
-    "@scope/jsii-calc-base-of-base": "^0.20.11"
+    "@scope/jsii-calc-base-of-base": "0.20.11"
   },
   "peerDependencies": {
-    "@scope/jsii-calc-base-of-base": "^0.20.11"
+    "@scope/jsii-calc-base-of-base": "0.20.11"
   },
   "devDependencies": {
     "@types/node": "^10.17.13",
diff --git a/packages/@scope/jsii-calc-base/test/assembly.jsii b/packages/@scope/jsii-calc-base/test/assembly.jsii
index f947cca587..201ae10995 100644
--- a/packages/@scope/jsii-calc-base/test/assembly.jsii
+++ b/packages/@scope/jsii-calc-base/test/assembly.jsii
@@ -8,29 +8,7 @@
     "url": "https://aws.amazon.com"
   },
   "dependencies": {
-    "@scope/jsii-calc-base-of-base": {
-      "targets": {
-        "dotnet": {
-          "namespace": "Amazon.JSII.Tests.CalculatorNamespace.BaseOfBaseNamespace",
-          "packageId": "Amazon.JSII.Tests.CalculatorPackageId.BaseOfBasePackageId"
-        },
-        "java": {
-          "maven": {
-            "artifactId": "calculator-base-of-base",
-            "groupId": "software.amazon.jsii.tests"
-          },
-          "package": "software.amazon.jsii.tests.calculator.baseofbase"
-        },
-        "js": {
-          "npm": "@scope/jsii-calc-base-of-base"
-        },
-        "python": {
-          "distName": "scope.jsii-calc-base-of-base",
-          "module": "scope.jsii_calc_base_of_base"
-        }
-      },
-      "version": "0.20.11"
-    }
+    "@scope/jsii-calc-base-of-base": "0.20.11"
   },
   "dependencyClosure": {
     "@scope/jsii-calc-base-of-base": {
@@ -53,8 +31,7 @@
           "distName": "scope.jsii-calc-base-of-base",
           "module": "scope.jsii_calc_base_of_base"
         }
-      },
-      "version": "0.20.11"
+      }
     }
   },
   "description": "An example direct dependency for jsii-calc.",
@@ -174,5 +151,5 @@
     }
   },
   "version": "0.20.11",
-  "fingerprint": "lSQlk5mMPd7fxaZoCdCekSFY4rDOAu3VnLuIcFUXA6o="
+  "fingerprint": "vaUHiWCfpSsCfXz18WPVQ3HhCBTPj23pDky4IqmEWxw="
 }
diff --git a/packages/@scope/jsii-calc-lib/test/assembly.jsii b/packages/@scope/jsii-calc-lib/test/assembly.jsii
index aee0bcedeb..2aa69c9263 100644
--- a/packages/@scope/jsii-calc-lib/test/assembly.jsii
+++ b/packages/@scope/jsii-calc-lib/test/assembly.jsii
@@ -8,29 +8,7 @@
     "url": "https://aws.amazon.com"
   },
   "dependencies": {
-    "@scope/jsii-calc-base": {
-      "targets": {
-        "dotnet": {
-          "namespace": "Amazon.JSII.Tests.CalculatorNamespace.BaseNamespace",
-          "packageId": "Amazon.JSII.Tests.CalculatorPackageId.BasePackageId"
-        },
-        "java": {
-          "maven": {
-            "artifactId": "calculator-base",
-            "groupId": "software.amazon.jsii.tests"
-          },
-          "package": "software.amazon.jsii.tests.calculator.base"
-        },
-        "js": {
-          "npm": "@scope/jsii-calc-base"
-        },
-        "python": {
-          "distName": "scope.jsii-calc-base",
-          "module": "scope.jsii_calc_base"
-        }
-      },
-      "version": "0.20.11"
-    }
+    "@scope/jsii-calc-base": "^0.20.11"
   },
   "dependencyClosure": {
     "@scope/jsii-calc-base": {
@@ -53,8 +31,7 @@
           "distName": "scope.jsii-calc-base",
           "module": "scope.jsii_calc_base"
         }
-      },
-      "version": "0.20.11"
+      }
     },
     "@scope/jsii-calc-base-of-base": {
       "targets": {
@@ -76,8 +53,7 @@
           "distName": "scope.jsii-calc-base-of-base",
           "module": "scope.jsii_calc_base_of_base"
         }
-      },
-      "version": "0.20.11"
+      }
     }
   },
   "description": "A simple calcuator library built on JSII.",
@@ -540,5 +516,5 @@
     }
   },
   "version": "0.20.11",
-  "fingerprint": "WSHD7tywHgFC9jmImvDuy7NGYCDWAAb49jk0ZPzCoFM="
+  "fingerprint": "tdRWsMWbPQxej79pQ39gbrrViv/Wl6vfTLY59IJPi4w="
 }
diff --git a/packages/jsii-calc/test/assembly.jsii b/packages/jsii-calc/test/assembly.jsii
index 841f093220..14afe903a7 100644
--- a/packages/jsii-calc/test/assembly.jsii
+++ b/packages/jsii-calc/test/assembly.jsii
@@ -34,77 +34,9 @@
     }
   ],
   "dependencies": {
-    "@scope/jsii-calc-base": {
-      "targets": {
-        "dotnet": {
-          "namespace": "Amazon.JSII.Tests.CalculatorNamespace.BaseNamespace",
-          "packageId": "Amazon.JSII.Tests.CalculatorPackageId.BasePackageId"
-        },
-        "java": {
-          "maven": {
-            "artifactId": "calculator-base",
-            "groupId": "software.amazon.jsii.tests"
-          },
-          "package": "software.amazon.jsii.tests.calculator.base"
-        },
-        "js": {
-          "npm": "@scope/jsii-calc-base"
-        },
-        "python": {
-          "distName": "scope.jsii-calc-base",
-          "module": "scope.jsii_calc_base"
-        }
-      },
-      "version": "0.20.11"
-    },
-    "@scope/jsii-calc-base-of-base": {
-      "targets": {
-        "dotnet": {
-          "namespace": "Amazon.JSII.Tests.CalculatorNamespace.BaseOfBaseNamespace",
-          "packageId": "Amazon.JSII.Tests.CalculatorPackageId.BaseOfBasePackageId"
-        },
-        "java": {
-          "maven": {
-            "artifactId": "calculator-base-of-base",
-            "groupId": "software.amazon.jsii.tests"
-          },
-          "package": "software.amazon.jsii.tests.calculator.baseofbase"
-        },
-        "js": {
-          "npm": "@scope/jsii-calc-base-of-base"
-        },
-        "python": {
-          "distName": "scope.jsii-calc-base-of-base",
-          "module": "scope.jsii_calc_base_of_base"
-        }
-      },
-      "version": "0.20.11"
-    },
-    "@scope/jsii-calc-lib": {
-      "targets": {
-        "dotnet": {
-          "namespace": "Amazon.JSII.Tests.CalculatorNamespace.LibNamespace",
-          "packageId": "Amazon.JSII.Tests.CalculatorPackageId.LibPackageId",
-          "versionSuffix": "-devpreview"
-        },
-        "java": {
-          "maven": {
-            "artifactId": "calculator-lib",
-            "groupId": "software.amazon.jsii.tests",
-            "versionSuffix": ".DEVPREVIEW"
-          },
-          "package": "software.amazon.jsii.tests.calculator.lib"
-        },
-        "js": {
-          "npm": "@scope/jsii-calc-lib"
-        },
-        "python": {
-          "distName": "scope.jsii-calc-lib",
-          "module": "scope.jsii_calc_lib"
-        }
-      },
-      "version": "0.20.11"
-    }
+    "@scope/jsii-calc-base": "^0.20.11",
+    "@scope/jsii-calc-base-of-base": "^0.20.11",
+    "@scope/jsii-calc-lib": "^0.20.11"
   },
   "dependencyClosure": {
     "@scope/jsii-calc-base": {
@@ -127,8 +59,7 @@
           "distName": "scope.jsii-calc-base",
           "module": "scope.jsii_calc_base"
         }
-      },
-      "version": "0.20.11"
+      }
     },
     "@scope/jsii-calc-base-of-base": {
       "targets": {
@@ -150,8 +81,7 @@
           "distName": "scope.jsii-calc-base-of-base",
           "module": "scope.jsii_calc_base_of_base"
         }
-      },
-      "version": "0.20.11"
+      }
     },
     "@scope/jsii-calc-lib": {
       "targets": {
@@ -175,8 +105,7 @@
           "distName": "scope.jsii-calc-lib",
           "module": "scope.jsii_calc_lib"
         }
-      },
-      "version": "0.20.11"
+      }
     }
   },
   "description": "A simple calcuator built on JSII.",
@@ -12093,5 +12022,5 @@
     }
   },
   "version": "0.20.11",
-  "fingerprint": "5M7u8+bWxu4amY/gs4Z/K4IpYqJCMGtnQiVoerS4uac="
+  "fingerprint": "j7Hsf1Hd/mih3Gr3UR7vYcXeLrbixxffBTzvSokikjM="
 }
diff --git a/packages/jsii-pacmak/lib/generator.ts b/packages/jsii-pacmak/lib/generator.ts
index 14166318e5..bc9aa592b8 100644
--- a/packages/jsii-pacmak/lib/generator.ts
+++ b/packages/jsii-pacmak/lib/generator.ts
@@ -502,7 +502,7 @@ export abstract class Generator implements IGenerator {
      * Looks up a jsii module in the dependency tree.
      * @param name The name of the jsii module to look up
      */
-  protected findModule(name: string): spec.PackageVersion {
+  protected findModule(name: string): spec.AssemblyConfiguration {
 
     // if this is the current module, return it
     if (this.assembly.name === name) {
@@ -515,7 +515,7 @@ export abstract class Generator implements IGenerator {
       return found;
     }
 
-    throw new Error(`Unable to find module ${name} as a direct or indirect dependency of ${this.assembly.name}`);
+    throw new Error(`Unable to find module ${name} as a dependency of ${this.assembly.name}`);
   }
 
   protected findType(fqn: string): spec.Type {
diff --git a/packages/jsii-pacmak/lib/targets/dotnet/dotnetgenerator.ts b/packages/jsii-pacmak/lib/targets/dotnet/dotnetgenerator.ts
index 9c1a1d111a..346e1157bc 100644
--- a/packages/jsii-pacmak/lib/targets/dotnet/dotnetgenerator.ts
+++ b/packages/jsii-pacmak/lib/targets/dotnet/dotnetgenerator.ts
@@ -79,6 +79,9 @@ export class DotNetGenerator extends Generator {
     await fs.mkdirp(path.join(outdir, packageId));
     await fs.copyFile(tarball, path.join(outdir, packageId, tarballFileName));
 
+    // Create an anchor file for the current model
+    this.generateDependencyAnchorFile();
+
     // Copying the .jsii file
     await fs.copyFile(this.jsiiFilePath, path.join(outdir, packageId, spec.SPEC_FILE_NAME));
 
@@ -86,6 +89,20 @@ export class DotNetGenerator extends Generator {
     return this.code.save(outdir);
   }
 
+  /**
+   * Generates the anchor file
+   */
+  protected generateDependencyAnchorFile() {
+    const namespace = `${this.assembly.targets!.dotnet!.namespace}.Internal.DependencyResolution`;
+    this.openFileIfNeeded('Anchor', namespace, false, false);
+    this.code.openBlock('public sealed class Anchor');
+    this.code.openBlock('public Anchor()');
+    this.typeresolver.namespaceDependencies.forEach(value => this.code.line(`new ${value.namespace}.Internal.DependencyResolution.Anchor();`));
+    this.code.closeBlock();
+    this.code.closeBlock();
+    this.closeFileIfNeeded('Anchor', namespace, false);
+  }
+
   /**
    * Not used as we override the save() method
    */
diff --git a/packages/jsii-pacmak/lib/targets/dotnet/dotnettyperesolver.ts b/packages/jsii-pacmak/lib/targets/dotnet/dotnettyperesolver.ts
index 66f3efb26b..f809520466 100644
--- a/packages/jsii-pacmak/lib/targets/dotnet/dotnettyperesolver.ts
+++ b/packages/jsii-pacmak/lib/targets/dotnet/dotnettyperesolver.ts
@@ -2,7 +2,7 @@ import * as spec from '@jsii/spec';
 import { DotNetDependency } from './filegenerator';
 import { DotNetNameUtils } from './nameutils';
 
-type FindModuleCallback = (fqn: string) => spec.Assembly | spec.PackageVersion;
+type FindModuleCallback = (fqn: string) => spec.AssemblyConfiguration;
 type FindTypeCallback = (fqn: string) => spec.Type;
 
 export class DotNetTypeResolver {
@@ -72,23 +72,21 @@ export class DotNetTypeResolver {
      */
   public resolveNamespacesDependencies(): void {
     const assmDependencies = this.assembly.dependencies ?? {};
-    for (const depName of Object.keys(assmDependencies)) {
-      const depInfo = assmDependencies[depName];
+    const assmConfigurations = this.assembly.dependencyClosure ?? {};
+    for (const [depName, version] of Object.entries(assmDependencies)) {
+      const depInfo = assmConfigurations[depName];
       if (!this.namespaceDependencies.has(depName)) {
-        const dotnetInfo = depInfo.targets!.dotnet;
-        const namespace = dotnetInfo!.namespace;
-        const packageId = dotnetInfo!.packageId;
-        let version = depInfo.version;
+        const dotnetInfo = depInfo.targets!.dotnet!;
+        const namespace = dotnetInfo.namespace;
+        const packageId = dotnetInfo.packageId;
         const suffix = depInfo.targets!.dotnet!.versionSuffix;
-        if (suffix) {
-          // suffix is guaranteed to start with a leading `-`
-          version = `${depInfo.version}${suffix}`;
-        }
+
         this.namespaceDependencies.set(depName, new DotNetDependency(
           namespace,
           packageId,
           depName,
-          version,
+          // suffix, when present, is guaranteed to start with a leading `-`
+          suffix ? `${version}${suffix}` : version,
           this.assembliesCurrentlyBeingCompiled.includes(depName)));
       }
     }
diff --git a/packages/jsii-pacmak/lib/targets/dotnet/filegenerator.ts b/packages/jsii-pacmak/lib/targets/dotnet/filegenerator.ts
index ace5d6cb3b..e372267753 100644
--- a/packages/jsii-pacmak/lib/targets/dotnet/filegenerator.ts
+++ b/packages/jsii-pacmak/lib/targets/dotnet/filegenerator.ts
@@ -6,15 +6,20 @@ import { DotNetNameUtils } from './nameutils';
 import * as logging from '../../logging';
 import { nextMajorVersion } from '../../util';
 import { TARGET_FRAMEWORK } from '../dotnet';
+import { toNuGetVersionRange } from '../version-utils';
 
 // Represents a dependency in the dependency tree.
 export class DotNetDependency {
+  public readonly version: string;
+
   public constructor(
     public readonly namespace: string,
     public readonly packageId: string,
     public readonly fqn: string,
-    public readonly version: string,
-    public readonly partOfCompilation: boolean) {
+    version: string,
+    public readonly partOfCompilation: boolean
+  ) {
+    this.version = toNuGetVersionRange(version);
   }
 }
 
diff --git a/packages/jsii-pacmak/lib/targets/java.ts b/packages/jsii-pacmak/lib/targets/java.ts
index 64d76d0a5c..3f24d39b5e 100644
--- a/packages/jsii-pacmak/lib/targets/java.ts
+++ b/packages/jsii-pacmak/lib/targets/java.ts
@@ -2,6 +2,7 @@ import * as clone from 'clone';
 import { toPascalCase } from 'codemaker/lib/case-utils';
 import * as fs from 'fs-extra';
 import * as reflect from 'jsii-reflect';
+import { Rosetta, typeScriptSnippetFromSource, Translation, markDownToJavaDoc } from 'jsii-rosetta';
 import * as spec from '@jsii/spec';
 import * as path from 'path';
 import * as xmlbuilder from 'xmlbuilder';
@@ -9,10 +10,10 @@ import { Generator } from '../generator';
 import { PackageInfo, Target, findLocalBuildDirs, TargetOptions } from '../target';
 import * as logging from '../logging';
 import { shell, Scratch, slugify, setExtend } from '../util';
-import { VERSION, VERSION_DESC } from '../version';
 import { TargetBuilder, BuildOptions } from '../builder';
 import { JsiiModule } from '../packaging';
-import { Rosetta, typeScriptSnippetFromSource, Translation, markDownToJavaDoc } from 'jsii-rosetta';
+import { VERSION, VERSION_DESC } from '../version';
+import { toMavenVersionRange } from './version-utils';
 import { INCOMPLETE_DISCLAIMER_COMPILING, INCOMPLETE_DISCLAIMER_NONCOMPILING } from '.';
 
 // eslint-disable-next-line @typescript-eslint/no-var-requires,@typescript-eslint/no-require-imports
@@ -429,7 +430,7 @@ class JavaGenerator extends Generator {
      * for example, we need to refer to their types when flatting the class hierarchy for
      * interface proxies.
      */
-  private readonly referencedModules: { [name: string]: spec.PackageVersion } = { };
+  private readonly referencedModules: { [name: string]: spec.AssemblyConfiguration } = { };
 
   public constructor(private readonly rosetta: Rosetta) {
     super({ generateOverloadsForMethodWithOptionals: true });
@@ -777,13 +778,12 @@ class JavaGenerator extends Generator {
     this.code.closeFile('pom.xml');
 
     /**
-         * Combines a version number with an optional suffix. If the suffix starts with '-' or '.', it will be
-         * concatenated as-is to the semantic version number. Otherwise, it'll be appended to the version number with an
-         * intercalar '-'.
-         *
-         * @param version the semantic version number
-         * @param suffix  the suffix, if any.
-         */
+     * Combines a version number with an optional suffix. The suffix, when present, must begin with
+     * '-' or '.', and will be concatenated as-is to the version number..
+     *
+     * @param version the semantic version number
+     * @param suffix  the suffix, if any.
+     */
     function makeVersion(version: string, suffix?: string): string {
       if (!suffix) { return version; }
       if (!suffix.startsWith('-') && !suffix.startsWith('.')) {
@@ -794,23 +794,22 @@ class JavaGenerator extends Generator {
 
     function mavenDependencies(this: JavaGenerator) {
       const dependencies = new Array<MavenDependency>();
-      const allDeps = { ...assm.dependencies ?? {}, ...this.referencedModules };
-      for (const depName of Object.keys(allDeps)) {
-        const dep = allDeps[depName];
-        if (!dep.targets?.java) {
+      for (const [depName, version] of Object.entries(this.assembly.dependencies ?? {})) {
+        const dep = this.assembly.dependencyClosure?.[depName];
+        if (!dep?.targets?.java) {
           throw new Error(`Assembly ${assm.name} depends on ${depName}, which does not declare a java target`);
         }
         dependencies.push({
           groupId: dep.targets.java.maven.groupId,
           artifactId: dep.targets.java.maven.artifactId,
-          version: makeVersion(dep.version, dep.targets.java.maven.versionSuffix),
+          version: toMavenVersionRange(version, dep.targets.java.maven.versionSuffix),
         });
       }
       // The JSII java runtime base classes
       dependencies.push({
         groupId: 'software.amazon.jsii',
         artifactId: 'jsii-runtime',
-        version: VERSION
+        version: toMavenVersionRange(`^${VERSION}`)
       });
 
       // Provides @javax.annotation.*
@@ -1833,10 +1832,12 @@ class JavaGenerator extends Generator {
   }
 
   private getNativeName(assm: spec.Assembly, name: string | undefined): string;
-  private getNativeName(assm: spec.PackageVersion, name: string | undefined, assmName: string): string;
-  private getNativeName(assm: spec.Assembly | spec.PackageVersion,
+  private getNativeName(assm: spec.AssemblyConfiguration, name: string | undefined, assmName: string): string;
+  private getNativeName(
+    assm: spec.AssemblyConfiguration,
     name: string | undefined,
-    assmName: string = (assm as spec.Assembly).name): string {
+    assmName: string = (assm as spec.Assembly).name
+  ): string {
     const javaPackage = assm.targets?.java?.package;
     if (!javaPackage) { throw new Error(`The module ${assmName} does not have a java.package setting`); }
     return `${javaPackage}${name ? `.${name}` : ''}`;
diff --git a/packages/jsii-pacmak/lib/targets/python.ts b/packages/jsii-pacmak/lib/targets/python.ts
index a9b4047c1e..198c4cdacf 100644
--- a/packages/jsii-pacmak/lib/targets/python.ts
+++ b/packages/jsii-pacmak/lib/targets/python.ts
@@ -1,8 +1,7 @@
-import * as path from 'path';
-
 import { CodeMaker, toSnakeCase } from 'codemaker';
 import * as escapeStringRegexp from 'escape-string-regexp';
 import * as reflect from 'jsii-reflect';
+import * as path from 'path';
 import * as spec from '@jsii/spec';
 import { Stability } from '@jsii/spec';
 import { Generator, GeneratorOptions } from '../generator';
@@ -11,6 +10,7 @@ import { md2rst } from '../markdown';
 import { Target, TargetOptions } from '../target';
 import { shell } from '../util';
 import { Translation, Rosetta, typeScriptSnippetFromSource } from 'jsii-rosetta';
+import { toPythonVersionRange } from './version-utils';
 import { INCOMPLETE_DISCLAIMER_COMPILING, INCOMPLETE_DISCLAIMER_NONCOMPILING } from '.';
 
 
@@ -1093,8 +1093,8 @@ class Module implements PythonType {
   private emitDependencyImports(code: CodeMaker, _resolver: TypeResolver) {
     const deps = Array.from(
       new Set([
-        ...Object.values(this.assembly.dependencies ?? {}).map(d => {
-          return d.targets!.python!.module;
+        ...Object.keys(this.assembly.dependencies ?? {}).map(d => {
+          return this.assembly.dependencyClosure![d]!.targets!.python!.module;
         }),
       ])
     );
@@ -1182,21 +1182,9 @@ class Package {
 
     // Compute our list of dependencies
     const dependencies: string[] = [];
-    const expectedDeps = this.metadata.dependencies ?? {};
-    for (const depName of Object.keys(expectedDeps)) {
-      const depInfo = expectedDeps[depName];
-      // We need to figure out what our version range is.
-      // Basically, if it starts with Zero we want to restrict things to
-      // ~=X.Y.Z. If it does not start with zero, then we want to do ~=X.Y,>=X.Y.Z.
-      const versionParts = depInfo.version.split('.');
-      let versionSpecifier: string;
-      if (versionParts[0] === '0') {
-        versionSpecifier = `~=${versionParts.slice(0, 3).join('.')}`;
-      } else {
-        versionSpecifier = `~=${versionParts.slice(0, 2).join('.')},>=${versionParts.slice(0, 3).join('.')}`;
-      }
-
-      dependencies.push(`${depInfo.targets!.python!.distName}${versionSpecifier}`);
+    for (const [depName, version] of Object.entries(this.metadata.dependencies ?? {})) {
+      const depInfo = this.metadata.dependencyClosure![depName];
+      dependencies.push(`${depInfo.targets!.python!.distName}${toPythonVersionRange(version)}`);
     }
 
     code.openFile('README.md');
@@ -1292,7 +1280,7 @@ class Package {
   }
 }
 
-type FindModuleCallback = (fqn: string) => spec.Assembly | spec.PackageVersion;
+type FindModuleCallback = (fqn: string) => spec.AssemblyConfiguration;
 type FindTypeCallback = (fqn: string) => spec.Type;
 
 interface TypeResolverOpts {
diff --git a/packages/jsii-pacmak/lib/targets/version-utils.ts b/packages/jsii-pacmak/lib/targets/version-utils.ts
new file mode 100644
index 0000000000..41afa1db02
--- /dev/null
+++ b/packages/jsii-pacmak/lib/targets/version-utils.ts
@@ -0,0 +1,93 @@
+import { Comparator, Range } from 'semver';
+
+/**
+ * Converts a SemVer range expression to a Maven version range expression.
+ *
+ * @param semverRange the SemVer range expression to convert.
+ * @param suffix      the suffix to add to versions in the range.
+ *
+ * @see https://cwiki.apache.org/confluence/display/MAVENOLD/Dependency+Mediation+and+Conflict+Resolution
+ */
+export function toMavenVersionRange(semverRange: string, suffix?: string): string {
+  return toBracketNotation(semverRange, suffix);
+}
+
+/**
+ * Converts a SemVer range expression to a NuGet version range expression.
+ *
+ * @param semverRange the SemVer range expression to convert.
+ *
+ * @see https://docs.microsoft.com/en-us/nuget/concepts/package-versioning#version-ranges-and-wildcards
+ */
+export function toNuGetVersionRange(semverRange: string): string {
+  return toBracketNotation(semverRange);
+}
+
+/**
+ * Converts a SemVer range expression to a Python setuptools compatible version
+ * constraint expression.
+ *
+ * @param semverRange the SemVer range expression to convert.
+ */
+export function toPythonVersionRange(semverRange: string): string {
+  const range = new Range(semverRange);
+  return range.set.map(
+    set => set.map(
+      comp => {
+        switch (comp.operator) {
+          case '':
+          case '=':
+            return `==${comp.semver.raw}`;
+          default: // >, >=, <, <= are all valid expressions
+            return `${comp.operator}${comp.semver.raw}`;
+        }
+      }
+    ).join(', ')
+  ).join(', ');
+}
+
+function toBracketNotation(semverRange: string, suffix?: string): string {
+  const range = new Range(semverRange);
+  return range.set.map(set => {
+    if (set.length === 1) {
+      switch (set[0].operator || '=') {
+        // "[version]" => means exactly version
+        case '=': return `[${addSuffix(set[0].semver.raw)}]`;
+        // "(version,]" => means greater than version
+        case '>': return `(${addSuffix(set[0].semver.raw)},]`;
+        // "[version,]" => means greater than or equal to that version
+        case '>=': return `[${addSuffix(set[0].semver.raw)},]`;
+        // "[,version)" => means less than version
+        case '<': return `[,${addSuffix(set[0].semver.raw)})`;
+        // "[,version]" => means less than or equal to version
+        case '<=': return `[,${addSuffix(set[0].semver.raw)}]`;
+      }
+    } else if (set.length === 2) {
+      const nugetRange = toBracketRange(set[0], set[1]);
+      if (nugetRange) {
+        return nugetRange;
+      }
+    }
+    throw new Error(`Unsupported SemVer range set: ${set.map(comp => comp.value).join(', ')}`);
+  }).join(', ');
+
+  function toBracketRange(left: Comparator, right: Comparator): string | undefined {
+    if (left.operator.startsWith('<') && right.operator.startsWith('>')) {
+      // Order isn't ideal, swap around..
+      [left, right] = [right, left];
+    }
+
+    if (!left.operator.startsWith('>') || !right.operator.startsWith('<')) {
+      // We only support ranges defined like "> (or >=) left, < (or <=) right"
+      return undefined;
+    }
+
+    const leftBrace = left.operator.endsWith('=') ? '[' : '(';
+    const rightBrace = right.operator.endsWith('=') ? ']' : ')';
+    return `${leftBrace}${addSuffix(left.semver.raw)},${addSuffix(right.semver.raw)}${rightBrace}`;
+  }
+
+  function addSuffix(str: string) {
+    return suffix ? `${str}${suffix}` : str;
+  }
+}
diff --git a/packages/jsii-pacmak/test/expected.jsii-calc-base-of-base/dotnet/Amazon.JSII.Tests.CalculatorPackageId.BaseOfBasePackageId/Amazon/JSII/Tests/CalculatorNamespace/BaseOfBaseNamespace/Internal/DependencyResolution/Anchor.cs b/packages/jsii-pacmak/test/expected.jsii-calc-base-of-base/dotnet/Amazon.JSII.Tests.CalculatorPackageId.BaseOfBasePackageId/Amazon/JSII/Tests/CalculatorNamespace/BaseOfBaseNamespace/Internal/DependencyResolution/Anchor.cs
new file mode 100644
index 0000000000..5cd3ec3cb0
--- /dev/null
+++ b/packages/jsii-pacmak/test/expected.jsii-calc-base-of-base/dotnet/Amazon.JSII.Tests.CalculatorPackageId.BaseOfBasePackageId/Amazon/JSII/Tests/CalculatorNamespace/BaseOfBaseNamespace/Internal/DependencyResolution/Anchor.cs
@@ -0,0 +1,9 @@
+namespace Amazon.JSII.Tests.CalculatorNamespace.BaseOfBaseNamespace.Internal.DependencyResolution
+{
+    public sealed class Anchor
+    {
+        public Anchor()
+        {
+        }
+    }
+}
diff --git a/packages/jsii-pacmak/test/expected.jsii-calc-base-of-base/java/pom.xml b/packages/jsii-pacmak/test/expected.jsii-calc-base-of-base/java/pom.xml
index 8ec3c5795a..ae1ff0a024 100644
--- a/packages/jsii-pacmak/test/expected.jsii-calc-base-of-base/java/pom.xml
+++ b/packages/jsii-pacmak/test/expected.jsii-calc-base-of-base/java/pom.xml
@@ -36,7 +36,7 @@
     <dependency>
       <groupId>software.amazon.jsii</groupId>
       <artifactId>jsii-runtime</artifactId>
-      <version>0.20.11</version>
+      <version>[0.20.11,0.21.0)</version>
     </dependency>
     <dependency>
       <groupId>javax.annotation</groupId>
diff --git a/packages/jsii-pacmak/test/expected.jsii-calc-base/dotnet/Amazon.JSII.Tests.CalculatorPackageId.BasePackageId/.jsii b/packages/jsii-pacmak/test/expected.jsii-calc-base/dotnet/Amazon.JSII.Tests.CalculatorPackageId.BasePackageId/.jsii
index f947cca587..201ae10995 100644
--- a/packages/jsii-pacmak/test/expected.jsii-calc-base/dotnet/Amazon.JSII.Tests.CalculatorPackageId.BasePackageId/.jsii
+++ b/packages/jsii-pacmak/test/expected.jsii-calc-base/dotnet/Amazon.JSII.Tests.CalculatorPackageId.BasePackageId/.jsii
@@ -8,29 +8,7 @@
     "url": "https://aws.amazon.com"
   },
   "dependencies": {
-    "@scope/jsii-calc-base-of-base": {
-      "targets": {
-        "dotnet": {
-          "namespace": "Amazon.JSII.Tests.CalculatorNamespace.BaseOfBaseNamespace",
-          "packageId": "Amazon.JSII.Tests.CalculatorPackageId.BaseOfBasePackageId"
-        },
-        "java": {
-          "maven": {
-            "artifactId": "calculator-base-of-base",
-            "groupId": "software.amazon.jsii.tests"
-          },
-          "package": "software.amazon.jsii.tests.calculator.baseofbase"
-        },
-        "js": {
-          "npm": "@scope/jsii-calc-base-of-base"
-        },
-        "python": {
-          "distName": "scope.jsii-calc-base-of-base",
-          "module": "scope.jsii_calc_base_of_base"
-        }
-      },
-      "version": "0.20.11"
-    }
+    "@scope/jsii-calc-base-of-base": "0.20.11"
   },
   "dependencyClosure": {
     "@scope/jsii-calc-base-of-base": {
@@ -53,8 +31,7 @@
           "distName": "scope.jsii-calc-base-of-base",
           "module": "scope.jsii_calc_base_of_base"
         }
-      },
-      "version": "0.20.11"
+      }
     }
   },
   "description": "An example direct dependency for jsii-calc.",
@@ -174,5 +151,5 @@
     }
   },
   "version": "0.20.11",
-  "fingerprint": "lSQlk5mMPd7fxaZoCdCekSFY4rDOAu3VnLuIcFUXA6o="
+  "fingerprint": "vaUHiWCfpSsCfXz18WPVQ3HhCBTPj23pDky4IqmEWxw="
 }
diff --git a/packages/jsii-pacmak/test/expected.jsii-calc-base/dotnet/Amazon.JSII.Tests.CalculatorPackageId.BasePackageId/Amazon.JSII.Tests.CalculatorPackageId.BasePackageId.csproj b/packages/jsii-pacmak/test/expected.jsii-calc-base/dotnet/Amazon.JSII.Tests.CalculatorPackageId.BasePackageId/Amazon.JSII.Tests.CalculatorPackageId.BasePackageId.csproj
index eca51885aa..4e409860ad 100644
--- a/packages/jsii-pacmak/test/expected.jsii-calc-base/dotnet/Amazon.JSII.Tests.CalculatorPackageId.BasePackageId/Amazon.JSII.Tests.CalculatorPackageId.BasePackageId.csproj
+++ b/packages/jsii-pacmak/test/expected.jsii-calc-base/dotnet/Amazon.JSII.Tests.CalculatorPackageId.BasePackageId/Amazon.JSII.Tests.CalculatorPackageId.BasePackageId.csproj
@@ -25,7 +25,7 @@
   </ItemGroup>
   <ItemGroup>
     <PackageReference Include="Amazon.JSII.Runtime" Version="[0.20.11,0.21.0)" />
-    <PackageReference Include="Amazon.JSII.Tests.CalculatorPackageId.BaseOfBasePackageId" Version="0.20.11" />
+    <PackageReference Include="Amazon.JSII.Tests.CalculatorPackageId.BaseOfBasePackageId" Version="[0.20.11]" />
   </ItemGroup>
   <PropertyGroup>
     <NoWarn>0612,0618</NoWarn>
diff --git a/packages/jsii-pacmak/test/expected.jsii-calc-base/dotnet/Amazon.JSII.Tests.CalculatorPackageId.BasePackageId/Amazon/JSII/Tests/CalculatorNamespace/BaseNamespace/Internal/DependencyResolution/Anchor.cs b/packages/jsii-pacmak/test/expected.jsii-calc-base/dotnet/Amazon.JSII.Tests.CalculatorPackageId.BasePackageId/Amazon/JSII/Tests/CalculatorNamespace/BaseNamespace/Internal/DependencyResolution/Anchor.cs
new file mode 100644
index 0000000000..4a5728b15d
--- /dev/null
+++ b/packages/jsii-pacmak/test/expected.jsii-calc-base/dotnet/Amazon.JSII.Tests.CalculatorPackageId.BasePackageId/Amazon/JSII/Tests/CalculatorNamespace/BaseNamespace/Internal/DependencyResolution/Anchor.cs
@@ -0,0 +1,10 @@
+namespace Amazon.JSII.Tests.CalculatorNamespace.BaseNamespace.Internal.DependencyResolution
+{
+    public sealed class Anchor
+    {
+        public Anchor()
+        {
+            new Amazon.JSII.Tests.CalculatorNamespace.BaseOfBaseNamespace.Internal.DependencyResolution.Anchor();
+        }
+    }
+}
diff --git a/packages/jsii-pacmak/test/expected.jsii-calc-base/java/pom.xml b/packages/jsii-pacmak/test/expected.jsii-calc-base/java/pom.xml
index 53f9bfcda7..144d30b73d 100644
--- a/packages/jsii-pacmak/test/expected.jsii-calc-base/java/pom.xml
+++ b/packages/jsii-pacmak/test/expected.jsii-calc-base/java/pom.xml
@@ -36,12 +36,12 @@
     <dependency>
       <groupId>software.amazon.jsii.tests</groupId>
       <artifactId>calculator-base-of-base</artifactId>
-      <version>0.20.11</version>
+      <version>[0.20.11]</version>
     </dependency>
     <dependency>
       <groupId>software.amazon.jsii</groupId>
       <artifactId>jsii-runtime</artifactId>
-      <version>0.20.11</version>
+      <version>[0.20.11,0.21.0)</version>
     </dependency>
     <dependency>
       <groupId>javax.annotation</groupId>
diff --git a/packages/jsii-pacmak/test/expected.jsii-calc-base/python/setup.py b/packages/jsii-pacmak/test/expected.jsii-calc-base/python/setup.py
index 960636132a..d76b93338a 100644
--- a/packages/jsii-pacmak/test/expected.jsii-calc-base/python/setup.py
+++ b/packages/jsii-pacmak/test/expected.jsii-calc-base/python/setup.py
@@ -32,7 +32,7 @@
     "install_requires": [
         "jsii~=0.20.11",
         "publication>=0.0.3",
-        "scope.jsii-calc-base-of-base~=0.20.11"
+        "scope.jsii-calc-base-of-base==0.20.11"
     ],
     "classifiers": [
         "Intended Audience :: Developers",
diff --git a/packages/jsii-pacmak/test/expected.jsii-calc-lib/dotnet/Amazon.JSII.Tests.CalculatorPackageId.LibPackageId/.jsii b/packages/jsii-pacmak/test/expected.jsii-calc-lib/dotnet/Amazon.JSII.Tests.CalculatorPackageId.LibPackageId/.jsii
index aee0bcedeb..2aa69c9263 100644
--- a/packages/jsii-pacmak/test/expected.jsii-calc-lib/dotnet/Amazon.JSII.Tests.CalculatorPackageId.LibPackageId/.jsii
+++ b/packages/jsii-pacmak/test/expected.jsii-calc-lib/dotnet/Amazon.JSII.Tests.CalculatorPackageId.LibPackageId/.jsii
@@ -8,29 +8,7 @@
     "url": "https://aws.amazon.com"
   },
   "dependencies": {
-    "@scope/jsii-calc-base": {
-      "targets": {
-        "dotnet": {
-          "namespace": "Amazon.JSII.Tests.CalculatorNamespace.BaseNamespace",
-          "packageId": "Amazon.JSII.Tests.CalculatorPackageId.BasePackageId"
-        },
-        "java": {
-          "maven": {
-            "artifactId": "calculator-base",
-            "groupId": "software.amazon.jsii.tests"
-          },
-          "package": "software.amazon.jsii.tests.calculator.base"
-        },
-        "js": {
-          "npm": "@scope/jsii-calc-base"
-        },
-        "python": {
-          "distName": "scope.jsii-calc-base",
-          "module": "scope.jsii_calc_base"
-        }
-      },
-      "version": "0.20.11"
-    }
+    "@scope/jsii-calc-base": "^0.20.11"
   },
   "dependencyClosure": {
     "@scope/jsii-calc-base": {
@@ -53,8 +31,7 @@
           "distName": "scope.jsii-calc-base",
           "module": "scope.jsii_calc_base"
         }
-      },
-      "version": "0.20.11"
+      }
     },
     "@scope/jsii-calc-base-of-base": {
       "targets": {
@@ -76,8 +53,7 @@
           "distName": "scope.jsii-calc-base-of-base",
           "module": "scope.jsii_calc_base_of_base"
         }
-      },
-      "version": "0.20.11"
+      }
     }
   },
   "description": "A simple calcuator library built on JSII.",
@@ -540,5 +516,5 @@
     }
   },
   "version": "0.20.11",
-  "fingerprint": "WSHD7tywHgFC9jmImvDuy7NGYCDWAAb49jk0ZPzCoFM="
+  "fingerprint": "tdRWsMWbPQxej79pQ39gbrrViv/Wl6vfTLY59IJPi4w="
 }
diff --git a/packages/jsii-pacmak/test/expected.jsii-calc-lib/dotnet/Amazon.JSII.Tests.CalculatorPackageId.LibPackageId/Amazon.JSII.Tests.CalculatorPackageId.LibPackageId.csproj b/packages/jsii-pacmak/test/expected.jsii-calc-lib/dotnet/Amazon.JSII.Tests.CalculatorPackageId.LibPackageId/Amazon.JSII.Tests.CalculatorPackageId.LibPackageId.csproj
index 39ad0bcf10..2275a0ab28 100644
--- a/packages/jsii-pacmak/test/expected.jsii-calc-lib/dotnet/Amazon.JSII.Tests.CalculatorPackageId.LibPackageId/Amazon.JSII.Tests.CalculatorPackageId.LibPackageId.csproj
+++ b/packages/jsii-pacmak/test/expected.jsii-calc-lib/dotnet/Amazon.JSII.Tests.CalculatorPackageId.LibPackageId/Amazon.JSII.Tests.CalculatorPackageId.LibPackageId.csproj
@@ -25,7 +25,7 @@
   </ItemGroup>
   <ItemGroup>
     <PackageReference Include="Amazon.JSII.Runtime" Version="[0.20.11,0.21.0)" />
-    <PackageReference Include="Amazon.JSII.Tests.CalculatorPackageId.BasePackageId" Version="0.20.11" />
+    <PackageReference Include="Amazon.JSII.Tests.CalculatorPackageId.BasePackageId" Version="[0.20.11,0.21.0)" />
   </ItemGroup>
   <PropertyGroup>
     <NoWarn>0612,0618</NoWarn>
diff --git a/packages/jsii-pacmak/test/expected.jsii-calc-lib/dotnet/Amazon.JSII.Tests.CalculatorPackageId.LibPackageId/Amazon/JSII/Tests/CalculatorNamespace/LibNamespace/Internal/DependencyResolution/Anchor.cs b/packages/jsii-pacmak/test/expected.jsii-calc-lib/dotnet/Amazon.JSII.Tests.CalculatorPackageId.LibPackageId/Amazon/JSII/Tests/CalculatorNamespace/LibNamespace/Internal/DependencyResolution/Anchor.cs
new file mode 100644
index 0000000000..19be6786f5
--- /dev/null
+++ b/packages/jsii-pacmak/test/expected.jsii-calc-lib/dotnet/Amazon.JSII.Tests.CalculatorPackageId.LibPackageId/Amazon/JSII/Tests/CalculatorNamespace/LibNamespace/Internal/DependencyResolution/Anchor.cs
@@ -0,0 +1,10 @@
+namespace Amazon.JSII.Tests.CalculatorNamespace.LibNamespace.Internal.DependencyResolution
+{
+    public sealed class Anchor
+    {
+        public Anchor()
+        {
+            new Amazon.JSII.Tests.CalculatorNamespace.BaseNamespace.Internal.DependencyResolution.Anchor();
+        }
+    }
+}
diff --git a/packages/jsii-pacmak/test/expected.jsii-calc-lib/java/pom.xml b/packages/jsii-pacmak/test/expected.jsii-calc-lib/java/pom.xml
index 2a7c3608d6..dd403ce6a8 100644
--- a/packages/jsii-pacmak/test/expected.jsii-calc-lib/java/pom.xml
+++ b/packages/jsii-pacmak/test/expected.jsii-calc-lib/java/pom.xml
@@ -36,12 +36,12 @@
     <dependency>
       <groupId>software.amazon.jsii.tests</groupId>
       <artifactId>calculator-base</artifactId>
-      <version>0.20.11</version>
+      <version>[0.20.11,0.21.0)</version>
     </dependency>
     <dependency>
       <groupId>software.amazon.jsii</groupId>
       <artifactId>jsii-runtime</artifactId>
-      <version>0.20.11</version>
+      <version>[0.20.11,0.21.0)</version>
     </dependency>
     <dependency>
       <groupId>javax.annotation</groupId>
diff --git a/packages/jsii-pacmak/test/expected.jsii-calc-lib/python/setup.py b/packages/jsii-pacmak/test/expected.jsii-calc-lib/python/setup.py
index fad4ca0394..3588e20486 100644
--- a/packages/jsii-pacmak/test/expected.jsii-calc-lib/python/setup.py
+++ b/packages/jsii-pacmak/test/expected.jsii-calc-lib/python/setup.py
@@ -32,7 +32,7 @@
     "install_requires": [
         "jsii~=0.20.11",
         "publication>=0.0.3",
-        "scope.jsii-calc-base~=0.20.11"
+        "scope.jsii-calc-base>=0.20.11, <0.21.0"
     ],
     "classifiers": [
         "Intended Audience :: Developers",
diff --git a/packages/jsii-pacmak/test/expected.jsii-calc/dotnet/Amazon.JSII.Tests.CalculatorPackageId/.jsii b/packages/jsii-pacmak/test/expected.jsii-calc/dotnet/Amazon.JSII.Tests.CalculatorPackageId/.jsii
index 841f093220..14afe903a7 100644
--- a/packages/jsii-pacmak/test/expected.jsii-calc/dotnet/Amazon.JSII.Tests.CalculatorPackageId/.jsii
+++ b/packages/jsii-pacmak/test/expected.jsii-calc/dotnet/Amazon.JSII.Tests.CalculatorPackageId/.jsii
@@ -34,77 +34,9 @@
     }
   ],
   "dependencies": {
-    "@scope/jsii-calc-base": {
-      "targets": {
-        "dotnet": {
-          "namespace": "Amazon.JSII.Tests.CalculatorNamespace.BaseNamespace",
-          "packageId": "Amazon.JSII.Tests.CalculatorPackageId.BasePackageId"
-        },
-        "java": {
-          "maven": {
-            "artifactId": "calculator-base",
-            "groupId": "software.amazon.jsii.tests"
-          },
-          "package": "software.amazon.jsii.tests.calculator.base"
-        },
-        "js": {
-          "npm": "@scope/jsii-calc-base"
-        },
-        "python": {
-          "distName": "scope.jsii-calc-base",
-          "module": "scope.jsii_calc_base"
-        }
-      },
-      "version": "0.20.11"
-    },
-    "@scope/jsii-calc-base-of-base": {
-      "targets": {
-        "dotnet": {
-          "namespace": "Amazon.JSII.Tests.CalculatorNamespace.BaseOfBaseNamespace",
-          "packageId": "Amazon.JSII.Tests.CalculatorPackageId.BaseOfBasePackageId"
-        },
-        "java": {
-          "maven": {
-            "artifactId": "calculator-base-of-base",
-            "groupId": "software.amazon.jsii.tests"
-          },
-          "package": "software.amazon.jsii.tests.calculator.baseofbase"
-        },
-        "js": {
-          "npm": "@scope/jsii-calc-base-of-base"
-        },
-        "python": {
-          "distName": "scope.jsii-calc-base-of-base",
-          "module": "scope.jsii_calc_base_of_base"
-        }
-      },
-      "version": "0.20.11"
-    },
-    "@scope/jsii-calc-lib": {
-      "targets": {
-        "dotnet": {
-          "namespace": "Amazon.JSII.Tests.CalculatorNamespace.LibNamespace",
-          "packageId": "Amazon.JSII.Tests.CalculatorPackageId.LibPackageId",
-          "versionSuffix": "-devpreview"
-        },
-        "java": {
-          "maven": {
-            "artifactId": "calculator-lib",
-            "groupId": "software.amazon.jsii.tests",
-            "versionSuffix": ".DEVPREVIEW"
-          },
-          "package": "software.amazon.jsii.tests.calculator.lib"
-        },
-        "js": {
-          "npm": "@scope/jsii-calc-lib"
-        },
-        "python": {
-          "distName": "scope.jsii-calc-lib",
-          "module": "scope.jsii_calc_lib"
-        }
-      },
-      "version": "0.20.11"
-    }
+    "@scope/jsii-calc-base": "^0.20.11",
+    "@scope/jsii-calc-base-of-base": "^0.20.11",
+    "@scope/jsii-calc-lib": "^0.20.11"
   },
   "dependencyClosure": {
     "@scope/jsii-calc-base": {
@@ -127,8 +59,7 @@
           "distName": "scope.jsii-calc-base",
           "module": "scope.jsii_calc_base"
         }
-      },
-      "version": "0.20.11"
+      }
     },
     "@scope/jsii-calc-base-of-base": {
       "targets": {
@@ -150,8 +81,7 @@
           "distName": "scope.jsii-calc-base-of-base",
           "module": "scope.jsii_calc_base_of_base"
         }
-      },
-      "version": "0.20.11"
+      }
     },
     "@scope/jsii-calc-lib": {
       "targets": {
@@ -175,8 +105,7 @@
           "distName": "scope.jsii-calc-lib",
           "module": "scope.jsii_calc_lib"
         }
-      },
-      "version": "0.20.11"
+      }
     }
   },
   "description": "A simple calcuator built on JSII.",
@@ -12093,5 +12022,5 @@
     }
   },
   "version": "0.20.11",
-  "fingerprint": "5M7u8+bWxu4amY/gs4Z/K4IpYqJCMGtnQiVoerS4uac="
+  "fingerprint": "j7Hsf1Hd/mih3Gr3UR7vYcXeLrbixxffBTzvSokikjM="
 }
diff --git a/packages/jsii-pacmak/test/expected.jsii-calc/dotnet/Amazon.JSII.Tests.CalculatorPackageId/Amazon.JSII.Tests.CalculatorPackageId.csproj b/packages/jsii-pacmak/test/expected.jsii-calc/dotnet/Amazon.JSII.Tests.CalculatorPackageId/Amazon.JSII.Tests.CalculatorPackageId.csproj
index 1a901072ec..50cc042d87 100644
--- a/packages/jsii-pacmak/test/expected.jsii-calc/dotnet/Amazon.JSII.Tests.CalculatorPackageId/Amazon.JSII.Tests.CalculatorPackageId.csproj
+++ b/packages/jsii-pacmak/test/expected.jsii-calc/dotnet/Amazon.JSII.Tests.CalculatorPackageId/Amazon.JSII.Tests.CalculatorPackageId.csproj
@@ -27,9 +27,9 @@
   </ItemGroup>
   <ItemGroup>
     <PackageReference Include="Amazon.JSII.Runtime" Version="[0.20.11,0.21.0)" />
-    <PackageReference Include="Amazon.JSII.Tests.CalculatorPackageId.BasePackageId" Version="0.20.11" />
-    <PackageReference Include="Amazon.JSII.Tests.CalculatorPackageId.BaseOfBasePackageId" Version="0.20.11" />
-    <PackageReference Include="Amazon.JSII.Tests.CalculatorPackageId.LibPackageId" Version="0.20.11-devpreview" />
+    <PackageReference Include="Amazon.JSII.Tests.CalculatorPackageId.BasePackageId" Version="[0.20.11,0.21.0)" />
+    <PackageReference Include="Amazon.JSII.Tests.CalculatorPackageId.BaseOfBasePackageId" Version="[0.20.11,0.21.0)" />
+    <PackageReference Include="Amazon.JSII.Tests.CalculatorPackageId.LibPackageId" Version="[0.20.11-devpreview,0.21.0)" />
   </ItemGroup>
   <PropertyGroup>
     <NoWarn>0612,0618</NoWarn>
diff --git a/packages/jsii-pacmak/test/expected.jsii-calc/dotnet/Amazon.JSII.Tests.CalculatorPackageId/Amazon/JSII/Tests/CalculatorNamespace/Internal/DependencyResolution/Anchor.cs b/packages/jsii-pacmak/test/expected.jsii-calc/dotnet/Amazon.JSII.Tests.CalculatorPackageId/Amazon/JSII/Tests/CalculatorNamespace/Internal/DependencyResolution/Anchor.cs
new file mode 100644
index 0000000000..b446d0e4ed
--- /dev/null
+++ b/packages/jsii-pacmak/test/expected.jsii-calc/dotnet/Amazon.JSII.Tests.CalculatorPackageId/Amazon/JSII/Tests/CalculatorNamespace/Internal/DependencyResolution/Anchor.cs
@@ -0,0 +1,12 @@
+namespace Amazon.JSII.Tests.CalculatorNamespace.Internal.DependencyResolution
+{
+    public sealed class Anchor
+    {
+        public Anchor()
+        {
+            new Amazon.JSII.Tests.CalculatorNamespace.BaseNamespace.Internal.DependencyResolution.Anchor();
+            new Amazon.JSII.Tests.CalculatorNamespace.BaseOfBaseNamespace.Internal.DependencyResolution.Anchor();
+            new Amazon.JSII.Tests.CalculatorNamespace.LibNamespace.Internal.DependencyResolution.Anchor();
+        }
+    }
+}
diff --git a/packages/jsii-pacmak/test/expected.jsii-calc/java/pom.xml b/packages/jsii-pacmak/test/expected.jsii-calc/java/pom.xml
index d91eb3248b..e7c101d5c8 100644
--- a/packages/jsii-pacmak/test/expected.jsii-calc/java/pom.xml
+++ b/packages/jsii-pacmak/test/expected.jsii-calc/java/pom.xml
@@ -57,22 +57,22 @@
     <dependency>
       <groupId>software.amazon.jsii.tests</groupId>
       <artifactId>calculator-base</artifactId>
-      <version>0.20.11</version>
+      <version>[0.20.11,0.21.0)</version>
     </dependency>
     <dependency>
       <groupId>software.amazon.jsii.tests</groupId>
       <artifactId>calculator-base-of-base</artifactId>
-      <version>0.20.11</version>
+      <version>[0.20.11,0.21.0)</version>
     </dependency>
     <dependency>
       <groupId>software.amazon.jsii.tests</groupId>
       <artifactId>calculator-lib</artifactId>
-      <version>0.20.11.DEVPREVIEW</version>
+      <version>[0.20.11.DEVPREVIEW,0.21.0.DEVPREVIEW)</version>
     </dependency>
     <dependency>
       <groupId>software.amazon.jsii</groupId>
       <artifactId>jsii-runtime</artifactId>
-      <version>0.20.11</version>
+      <version>[0.20.11,0.21.0)</version>
     </dependency>
     <dependency>
       <groupId>javax.annotation</groupId>
diff --git a/packages/jsii-pacmak/test/expected.jsii-calc/python/setup.py b/packages/jsii-pacmak/test/expected.jsii-calc/python/setup.py
index 4b0431ce97..eb7056b80a 100644
--- a/packages/jsii-pacmak/test/expected.jsii-calc/python/setup.py
+++ b/packages/jsii-pacmak/test/expected.jsii-calc/python/setup.py
@@ -32,9 +32,9 @@
     "install_requires": [
         "jsii~=0.20.11",
         "publication>=0.0.3",
-        "scope.jsii-calc-base~=0.20.11",
-        "scope.jsii-calc-base-of-base~=0.20.11",
-        "scope.jsii-calc-lib~=0.20.11"
+        "scope.jsii-calc-base>=0.20.11, <0.21.0",
+        "scope.jsii-calc-base-of-base>=0.20.11, <0.21.0",
+        "scope.jsii-calc-lib>=0.20.11, <0.21.0"
     ],
     "classifiers": [
         "Intended Audience :: Developers",
diff --git a/packages/jsii-pacmak/test/targets/version-utils.test.ts b/packages/jsii-pacmak/test/targets/version-utils.test.ts
new file mode 100644
index 0000000000..9b227c7303
--- /dev/null
+++ b/packages/jsii-pacmak/test/targets/version-utils.test.ts
@@ -0,0 +1,77 @@
+import { toMavenVersionRange, toNuGetVersionRange, toPythonVersionRange } from '../../lib/targets/version-utils';
+
+const examples: Record<string, { maven: string, nuget: string, python: string }> = {
+  // Regular versions, "classic" ranges
+  '1.2.3': {
+    maven: '[1.2.3]',
+    nuget: '[1.2.3]',
+    python: '==1.2.3',
+  },
+  '~1.2.3': {
+    maven: '[1.2.3,1.3.0)',
+    nuget: '[1.2.3,1.3.0)',
+    python: '>=1.2.3, <1.3.0',
+  },
+  '^1.2.3': {
+    maven: '[1.2.3,2.0.0)',
+    nuget: '[1.2.3,2.0.0)',
+    python: '>=1.2.3, <2.0.0',
+  },
+
+  // Pre-1.0 versions, "classic" ranges
+  '0.1.2': {
+    maven: '[0.1.2]',
+    nuget: '[0.1.2]',
+    python: '==0.1.2',
+  },
+  '~0.1.2': {
+    maven: '[0.1.2,0.2.0)',
+    nuget: '[0.1.2,0.2.0)',
+    python: '>=0.1.2, <0.2.0',
+  },
+  '^0.1.2': {
+    maven: '[0.1.2,0.2.0)',
+    nuget: '[0.1.2,0.2.0)',
+    python: '>=0.1.2, <0.2.0',
+  },
+
+  // Less usual ranges
+  '>0.1.2': {
+    maven: '(0.1.2,]',
+    nuget: '(0.1.2,]',
+    python: '>0.1.2',
+  },
+  '>=0.1.2': {
+    maven: '[0.1.2,]',
+    nuget: '[0.1.2,]',
+    python: '>=0.1.2',
+  },
+  '<0.1.2': {
+    maven: '[,0.1.2)',
+    nuget: '[,0.1.2)',
+    python: '<0.1.2',
+  },
+  '<=0.1.2': {
+    maven: '[,0.1.2]',
+    nuget: '[,0.1.2]',
+    python: '<=0.1.2',
+  },
+};
+
+describe(toMavenVersionRange, () => {
+  for (const [semver, { maven }] of Object.entries(examples)) {
+    test(`${semver} translates to ${maven}`, () => expect(toMavenVersionRange(semver)).toEqual(maven));
+  }
+});
+
+describe(toNuGetVersionRange, () => {
+  for (const [semver, { nuget }] of Object.entries(examples)) {
+    test(`${semver} translates to ${nuget}`, () => expect(toNuGetVersionRange(semver)).toEqual(nuget));
+  }
+});
+
+describe(toPythonVersionRange, () => {
+  for (const [semver, { python }] of Object.entries(examples)) {
+    test(`${semver} translates to ${python}`, () => expect(toPythonVersionRange(semver)).toEqual(python));
+  }
+});
diff --git a/packages/jsii-reflect/lib/dependency.ts b/packages/jsii-reflect/lib/dependency.ts
index 6a6a5c66a1..769e36fc43 100644
--- a/packages/jsii-reflect/lib/dependency.ts
+++ b/packages/jsii-reflect/lib/dependency.ts
@@ -1,21 +1,13 @@
-import * as jsii from '@jsii/spec';
 import { TypeSystem } from './type-system';
 
 export class Dependency {
   public constructor(
     public readonly system: TypeSystem,
     private readonly name: string,
-    public readonly spec: jsii.PackageVersion
+    public readonly version: string
   ) { }
 
   public get assembly() {
     return this.system.findAssembly(this.name);
   }
-
-  /**
-   * Version of the package.
-   */
-  public get version() {
-    return this.spec.version;
-  }
 }
diff --git a/packages/jsii/lib/assembler.ts b/packages/jsii/lib/assembler.ts
index 67facf3344..eeec9162bd 100644
--- a/packages/jsii/lib/assembler.ts
+++ b/packages/jsii/lib/assembler.ts
@@ -6,7 +6,6 @@ import * as fs from 'fs-extra';
 import * as spec from '@jsii/spec';
 import * as log4js from 'log4js';
 import * as path from 'path';
-import * as semver from 'semver';
 import * as ts from 'typescript';
 import { JSII_DIAGNOSTICS_CODE } from './compiler';
 import { getReferencedDocParams, parseSymbolDocumentation } from './docs';
@@ -115,8 +114,8 @@ export class Assembler implements Emitter {
       author: this.projectInfo.author,
       contributors: this.projectInfo.contributors && [...this.projectInfo.contributors],
       repository: this.projectInfo.repository,
-      dependencies: this._toDependencies(this.projectInfo.dependencies),
-      dependencyClosure: this._buildDependencyClosure(this.projectInfo.dependencies),
+      dependencies: noEmptyDict({ ...this.projectInfo.dependencies, ...this.projectInfo.peerDependencies }),
+      dependencyClosure: noEmptyDict(toDependencyClosure(this.projectInfo.dependencyClosure)),
       bundled: this.projectInfo.bundleDependencies,
       types: this._types,
       targets: this.projectInfo.targets,
@@ -234,14 +233,13 @@ export class Assembler implements Emitter {
     if (assm === this.projectInfo.name) {
       type = this._types[ref];
     } else {
-      const assembly = this.projectInfo.transitiveDependencies.find(dep => dep.name === assm);
+      const assembly = this.projectInfo.dependencyClosure.find(dep => dep.name === assm);
       type = assembly?.types?.[ref];
 
       // since we are exposing a type of this assembly in this module's public API,
       // we expect it to appear as a peer dependency instead of a normal dependency.
       if (assembly) {
-        const asPeerDependency = this.projectInfo.peerDependencies.find(d => d.name === assembly.name);
-        if (!asPeerDependency) {
+        if (!(assembly.name in this.projectInfo.peerDependencies)) {
           this._diagnostic(referencingNode, ts.DiagnosticCategory.Warning,
             `The type '${ref}' is exposed in the public API of this module. ` +
             `Therefore, the module '${assembly.name}' must also be defined under "peerDependencies". ` +
@@ -1341,71 +1339,6 @@ export class Assembler implements Emitter {
       }
     }
   }
-
-  private _toDependencies(assemblies: readonly spec.Assembly[]): { [name: string]: spec.PackageVersion } | undefined {
-    const ret: { [name: string]: spec.PackageVersion } = {};
-
-    for (const a of assemblies) {
-      Object.assign(ret, assemblyToPackageVersionMap(a));
-    }
-
-    return noEmptyDict(ret);
-  }
-
-  private _buildDependencyClosure(assemblies: readonly spec.Assembly[]): { [name: string]: spec.PackageVersion } | undefined {
-    // Merge the dependency closures of all dependencies and add the direct dependencies.
-    // There should not be version conflicts between them but we guard against it anyway.
-
-    // Get an array of dependency maps
-    const dependencyBags = flatten(assemblies.map(a => [assemblyToPackageVersionMap(a), a.dependencies ?? {}]));
-
-    const warned = new Set<string>();
-    const result: { [name: string]: spec.PackageVersion } = {};
-    for (const bag of dependencyBags) {
-      for (const [name, packV] of Object.entries(bag)) {
-        maybeRecord.call(this, name, packV);
-      }
-    }
-
-    return noEmptyDict(result);
-
-    function maybeRecord(this: Assembler, name: string, pack: spec.PackageVersion) {
-      let recordThisDependency = true;
-
-      if (name in result) {
-        // Two dependencies on the same package, find the right version to use
-        const highestVersion = mostConstrainedVersion(result[name].version, pack.version);
-
-        if (highestVersion === undefined) {
-          warnAboutVersionConflict.call(this, name, result[name].version, pack.version);
-        }
-
-        recordThisDependency = pack.version === highestVersion;
-      }
-
-      if (recordThisDependency) {
-        result[name] = {
-          version: pack.version,
-          targets: pack.targets,
-        };
-      }
-    }
-
-    function warnAboutVersionConflict(this: Assembler, name: string, v1: string, v2: string) {
-      if (warned.has(name)) { return; }
-      this._diagnostic(null, ts.DiagnosticCategory.Error, `Conflicting dependencies on incompatible versions for package '${name}': ${v1} and ${v2}`);
-      warned.add(name);
-    }
-  }
-}
-
-function assemblyToPackageVersionMap(a: spec.Assembly): {[key: string]: spec.PackageVersion} {
-  return {
-    [a.name]: {
-      version: a.version,
-      targets: a.targets
-    }
-  };
 }
 
 function _fingerprint(assembly: spec.Assembly): spec.Assembly {
@@ -1624,35 +1557,20 @@ function* intersect<T>(xs: Set<T>, ys: Set<T>) {
   }
 }
 
-/**
- * Return the most constrained version given two versions
- *
- * Returns the highest version. Return undefined if the values are not pairwise
- * comparable.
- */
-function mostConstrainedVersion(version1: string, version2: string): string | undefined {
-  if (semver.satisfies(version1, `^${version2}`)) {
-    // If v1 satisifies v2, then either:
-    // - v2 also satisfies v1, in which case it doesn't matter which we return
-    // - v2 does not satisfy v1, in which it must be the case that v1 is higher
-    return version1;
-  }
-
-  // Reverse logic
-  if (semver.satisfies(version2, `^${version1}`)) { return version2; }
-
-  return undefined;
-}
-
-function flatten<T>(xs: T[][]): T[] {
-  return Array.prototype.concat.call([], ...xs);
-}
-
 function noEmptyDict<T>(xs: {[key: string]: T}): {[key: string]: T} | undefined {
   if (Object.keys(xs).length === 0) { return undefined; }
   return xs;
 }
 
+function toDependencyClosure(assemblies: readonly spec.Assembly[]): { [name: string]: spec.AssemblyConfiguration } {
+  const result: { [name: string]: spec.AssemblyTargets } = {};
+  for (const assembly of assemblies) {
+    if (!assembly.targets) { continue; }
+    result[assembly.name] = { targets: assembly.targets };
+  }
+  return result;
+}
+
 /**
  * Check whether this type is the intrinsic TypeScript "error type"
  *
diff --git a/packages/jsii/lib/project-info.ts b/packages/jsii/lib/project-info.ts
index 864457aab6..1fb1b894d6 100644
--- a/packages/jsii/lib/project-info.ts
+++ b/packages/jsii/lib/project-info.ts
@@ -3,6 +3,7 @@ import * as spec from '@jsii/spec';
 import * as log4js from 'log4js';
 import * as path from 'path';
 import * as semver from 'semver';
+import { intersect } from 'semver-intersect';
 import { parsePerson, parseRepository } from './utils';
 
 // eslint-disable-next-line @typescript-eslint/no-var-requires, @typescript-eslint/no-require-imports
@@ -35,9 +36,9 @@ export interface ProjectInfo {
   readonly main: string;
   readonly types: string;
 
-  readonly dependencies: readonly spec.Assembly[];
-  readonly peerDependencies: readonly spec.Assembly[];
-  readonly transitiveDependencies: readonly spec.Assembly[];
+  readonly dependencies: { readonly [name: string]: string };
+  readonly peerDependencies: { readonly [name: string]: string };
+  readonly dependencyClosure: readonly spec.Assembly[];
   readonly bundleDependencies?: { readonly [name: string]: string };
   readonly targets: spec.AssemblyTargets;
   readonly metadata?: { [key: string]: any };
@@ -107,7 +108,7 @@ export async function loadProjectInfo(projectRoot: string, { fixPeerDependencies
   const peerDependencies =
         await _loadDependencies(pkg.peerDependencies, projectRoot, transitiveAssemblies);
 
-  const transitiveDependencies = Object.keys(transitiveAssemblies).map(name => transitiveAssemblies[name]);
+  const transitiveDependencies = Object.values(transitiveAssemblies);
 
   return {
     projectRoot,
@@ -127,7 +128,7 @@ export async function loadProjectInfo(projectRoot: string, { fixPeerDependencies
 
     dependencies,
     peerDependencies,
-    transitiveDependencies,
+    dependencyClosure: transitiveDependencies,
     bundleDependencies,
     targets: {
       ..._required(pkg.jsii, 'The "package.json" file must specify the "jsii" attribute').targets,
@@ -158,12 +159,14 @@ function _guessRepositoryType(url: string): string {
   throw new Error(`The "package.json" file must specify the "repository.type" attribute (could not guess from ${url})`);
 }
 
-async function _loadDependencies(dependencies: { [name: string]: string | spec.PackageVersion } | undefined,
+async function _loadDependencies(
+  dependencies: { [name: string]: string } | undefined,
   searchPath: string,
   transitiveAssemblies: { [name: string]: spec.Assembly },
-  bundled = new Set<string>()): Promise<spec.Assembly[]> {
-  if (!dependencies) { return []; }
-  const assemblies = new Array<spec.Assembly>();
+  bundled = new Set<string>()
+): Promise<{ [name: string]: string }> {
+  if (!dependencies) { return {}; }
+  const packageVersions: { [name: string]: string } = {};
   for (const name of Object.keys(dependencies)) {
     if (bundled.has(name)) { continue; }
     const { version: versionString, localPackage } = _resolveVersion(dependencies[name], searchPath);
@@ -178,7 +181,9 @@ async function _loadDependencies(dependencies: { [name: string]: string | spec.P
     if (!version.intersects(new semver.Range(assm.version))) {
       throw new Error(`Declared dependency on version ${versionString} of ${name}, but version ${assm.version} was found`);
     }
-    assemblies.push(assm);
+    packageVersions[assm.name] = packageVersions[assm.name] != null
+      ? intersect(versionString!, packageVersions[assm.name])
+      : versionString!;
     transitiveAssemblies[assm.name] = assm;
     const pkgDir = path.dirname(pkg);
     if (assm.dependencies) {
@@ -186,7 +191,7 @@ async function _loadDependencies(dependencies: { [name: string]: string | spec.P
       await _loadDependencies(assm.dependencies, pkgDir, transitiveAssemblies);
     }
   }
-  return assemblies;
+  return packageVersions;
 }
 
 const ASSEMBLY_CACHE = new Map<string, spec.Assembly>();
@@ -278,11 +283,7 @@ function _validateStability(stability: string | undefined, deprecated: string |
   return stability as spec.Stability;
 }
 
-function _resolveVersion(dep: spec.PackageVersion | string | undefined, searchPath: string): { version: string | undefined, localPackage?: string } {
-  if (typeof dep !== 'string') {
-    return { version: dep?.version };
-  }
-
+function _resolveVersion(dep: string, searchPath: string): { version: string | undefined, localPackage?: string } {
   const matches = /^file:(.+)$/.exec(dep);
   if (!matches) {
     return { version: dep };
diff --git a/packages/jsii/lib/validator.ts b/packages/jsii/lib/validator.ts
index 7eb2dc29d8..f29c25b386 100644
--- a/packages/jsii/lib/validator.ts
+++ b/packages/jsii/lib/validator.ts
@@ -130,7 +130,7 @@ function _defaultValidations(): ValidationFunction[] {
         }
         continue;
       }
-      const foreignAssm = validator.projectInfo.transitiveDependencies.find(dep => dep.name === assm);
+      const foreignAssm = validator.projectInfo.dependencyClosure.find(dep => dep.name === assm);
       if (!foreignAssm) {
         diagnostic(ts.DiagnosticCategory.Error,
           `Type reference is rooted in unknown module: ${assm}`);
@@ -362,7 +362,7 @@ function _dereference(typeRef: string | spec.NamedTypeReference, assembly: spec.
   if (assembly.name === assm) {
     return assembly.types?.[typeRef];
   }
-  const foreignAssm = validator.projectInfo.transitiveDependencies.find(dep => dep.name === assm);
+  const foreignAssm = validator.projectInfo.dependencyClosure.find(dep => dep.name === assm);
   return foreignAssm?.types?.[typeRef];
 }
 
diff --git a/packages/jsii/package.json b/packages/jsii/package.json
index eac0430c64..5cd9aaa34d 100644
--- a/packages/jsii/package.json
+++ b/packages/jsii/package.json
@@ -40,6 +40,7 @@
     "fs-extra": "^8.1.0",
     "log4js": "^6.1.0",
     "semver": "^7.1.1",
+    "semver-intersect": "^1.4.0",
     "sort-json": "^2.0.0",
     "spdx-license-list": "^6.1.0",
     "typescript": "~3.7.4",
diff --git a/packages/jsii/test/negatives.test.ts b/packages/jsii/test/negatives.test.ts
index 45b70c46f1..9a33f8bbfe 100644
--- a/packages/jsii/test/negatives.test.ts
+++ b/packages/jsii/test/negatives.test.ts
@@ -74,9 +74,9 @@ function _makeProjectInfo(types: string): ProjectInfo {
     license: 'Apache-2.0',
     author: { name: 'John Doe', roles: ['author'] },
     repository: { type: 'git', url: 'https://github.com/aws/jsii.git' },
-    dependencies: [],
-    peerDependencies: [],
-    transitiveDependencies: [],
+    dependencies: {},
+    peerDependencies: {},
+    dependencyClosure: [],
     bundleDependencies: {},
     targets: {},
     excludeTypescript: [],
diff --git a/packages/jsii/test/project-info.test.ts b/packages/jsii/test/project-info.test.ts
index 45a0787684..44bbe2d8dd 100644
--- a/packages/jsii/test/project-info.test.ts
+++ b/packages/jsii/test/project-info.test.ts
@@ -18,8 +18,8 @@ const BASE_PROJECT = {
   jsii: {
     targets: { foo: { bar: 'baz' } }
   },
-  dependencies: { 'jsii-test-dep': '^1.2.3' },
-  peerDependencies: { 'jsii-test-dep': '^1.2.3' }
+  dependencies: { 'jsii-test-dep': '^1.2.3' } as { [name: string]: string },
+  peerDependencies: { 'jsii-test-dep': '^1.2.3' } as { [name: string]: string }
 };
 
 describe('loadProjectInfo', () => {
@@ -36,8 +36,8 @@ describe('loadProjectInfo', () => {
     expect(info.repository?.type).toBe('git');
     expect(info.repository?.url).toBe(BASE_PROJECT.repository.url);
     expect(info.targets).toEqual({ ...BASE_PROJECT.jsii.targets, js: { npm: BASE_PROJECT.name } });
-    expect(info.dependencies).toEqual([TEST_DEP_ASSEMBLY]);
-    expect(info.transitiveDependencies).toEqual([TEST_DEP_ASSEMBLY, TEST_DEP_DEP_ASSEMBLY]);
+    expect(info.dependencies).toEqual({ [TEST_DEP_ASSEMBLY.name]: BASE_PROJECT.dependencies[TEST_DEP_ASSEMBLY.name] });
+    expect(info.dependencyClosure).toEqual([TEST_DEP_ASSEMBLY, TEST_DEP_DEP_ASSEMBLY]);
   }));
 
   test('loads valid project (UNLICENSED)', () => _withTestProject(async projectRoot => {
@@ -148,9 +148,7 @@ const TEST_DEP_ASSEMBLY: spec.Assembly = {
   author: { name: 'Amazon Web Services', url: 'https://aws.amazon.com', organization: true, roles: ['author'] },
   fingerprint: 'F1NG3RPR1N7',
   dependencies: {
-    'jsii-test-dep-dep': {
-      version: '3.2.1',
-    }
+    'jsii-test-dep-dep': '3.2.1',
   },
   jsiiVersion: VERSION,
 };
diff --git a/packages/jsii/vendor/.gitignore b/packages/jsii/vendor/.gitignore
new file mode 100644
index 0000000000..f955bf36ab
--- /dev/null
+++ b/packages/jsii/vendor/.gitignore
@@ -0,0 +1 @@
+!*.d.ts
diff --git a/packages/jsii/vendor/semver-intersect.d.ts b/packages/jsii/vendor/semver-intersect.d.ts
new file mode 100644
index 0000000000..c7f919bcf7
--- /dev/null
+++ b/packages/jsii/vendor/semver-intersect.d.ts
@@ -0,0 +1,13 @@
+/// Hand-written declaration for the semver-intersect module
+declare module 'semver-intersect' {
+  /**
+   * Computes the intersection between multiple semver ranges.
+   *
+   * @param ranges the ranges for which the intersection is requested.
+   *
+   * @returns the intersection of `ranges`.
+   *
+   * @throws Error if the intersection is empty.
+   */
+  function intersect(...ranges: string[]): string;
+}
diff --git a/yarn.lock b/yarn.lock
index f7157bdedb..6f4ed898d6 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -7140,7 +7140,14 @@ schema-utils@^1.0.0:
     ajv-errors "^1.0.0"
     ajv-keywords "^3.1.0"
 
-"semver@2 || 3 || 4 || 5", "semver@2.x || 3.x || 4 || 5", semver@^5.3.0, semver@^5.4.1, semver@^5.5.0, semver@^5.5.1, semver@^5.6.0, semver@^5.7.0:
+semver-intersect@^1.4.0:
+  version "1.4.0"
+  resolved "https://registry.yarnpkg.com/semver-intersect/-/semver-intersect-1.4.0.tgz#bdd9c06bedcdd2fedb8cd352c3c43ee8c61321f3"
+  integrity sha512-d8fvGg5ycKAq0+I6nfWeCx6ffaWJCsBYU0H2Rq56+/zFePYfT8mXkB3tWBSjR5BerkHNZ5eTPIk1/LBYas35xQ==
+  dependencies:
+    semver "^5.0.0"
+
+"semver@2 || 3 || 4 || 5", "semver@2.x || 3.x || 4 || 5", semver@^5.0.0, semver@^5.3.0, semver@^5.4.1, semver@^5.5.0, semver@^5.5.1, semver@^5.6.0, semver@^5.7.0:
   version "5.7.1"
   resolved "https://registry.yarnpkg.com/semver/-/semver-5.7.1.tgz#a954f931aeba508d307bbf069eff0c01c96116f7"
   integrity sha512-sauaDf/PZdVgrLTNYHRtpXa1iRiKcaebiKQ1BJdpQlWH2lCvexQdX55snPFyK7QzpudqbCI0qXFfOasHdyNDGQ==