diff --git a/package-lock.json b/package-lock.json
index d1e5e10e..6bb65410 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1933,6 +1933,14 @@
         "semver": "^5.5.0",
         "shebang-command": "^1.2.0",
         "which": "^1.2.9"
+      },
+      "dependencies": {
+        "semver": {
+          "version": "5.7.0",
+          "resolved": "https://registry.npmjs.org/semver/-/semver-5.7.0.tgz",
+          "integrity": "sha512-Ya52jSX2u7QKghxeoFGpLwCtGlt7j0oY9DYb5apt9nPlJ42ID+ulTXESnt/qAQcoSERyZ5sl3LDIOw0nAn/5DA==",
+          "dev": true
+        }
       }
     },
     "currently-unhandled": {
@@ -2333,6 +2341,12 @@
           "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.1.tgz",
           "integrity": "sha512-tgp+dl5cGk28utYktBsrFqA7HKgrhgPsg6Z/EfhWI4gl1Hwq8B/GmY/0oXZ6nF8hDVesS/FpnYaD/kOWhYQvyg==",
           "dev": true
+        },
+        "semver": {
+          "version": "5.7.0",
+          "resolved": "https://registry.npmjs.org/semver/-/semver-5.7.0.tgz",
+          "integrity": "sha512-Ya52jSX2u7QKghxeoFGpLwCtGlt7j0oY9DYb5apt9nPlJ42ID+ulTXESnt/qAQcoSERyZ5sl3LDIOw0nAn/5DA==",
+          "dev": true
         }
       }
     },
@@ -3899,6 +3913,12 @@
             "find-up": "^2.0.0",
             "read-pkg": "^3.0.0"
           }
+        },
+        "semver": {
+          "version": "5.7.0",
+          "resolved": "https://registry.npmjs.org/semver/-/semver-5.7.0.tgz",
+          "integrity": "sha512-Ya52jSX2u7QKghxeoFGpLwCtGlt7j0oY9DYb5apt9nPlJ42ID+ulTXESnt/qAQcoSERyZ5sl3LDIOw0nAn/5DA==",
+          "dev": true
         }
       }
     },
@@ -4141,6 +4161,14 @@
             "resolve": "^1.10.0",
             "semver": "2 || 3 || 4 || 5",
             "validate-npm-package-license": "^3.0.1"
+          },
+          "dependencies": {
+            "semver": {
+              "version": "5.7.0",
+              "resolved": "https://registry.npmjs.org/semver/-/semver-5.7.0.tgz",
+              "integrity": "sha512-Ya52jSX2u7QKghxeoFGpLwCtGlt7j0oY9DYb5apt9nPlJ42ID+ulTXESnt/qAQcoSERyZ5sl3LDIOw0nAn/5DA==",
+              "dev": true
+            }
           }
         },
         "p-limit": {
@@ -5462,6 +5490,13 @@
       "integrity": "sha512-uq1iL79YjfYC0WXoHbC/z28q/9pOl8kSHaXdWmAAc8No+bDwqkZbzIJz55g/MUsPgSGm9LZ7QSUbzTcH5tz47w==",
       "requires": {
         "semver": "^5.3.0"
+      },
+      "dependencies": {
+        "semver": {
+          "version": "5.7.0",
+          "resolved": "https://registry.npmjs.org/semver/-/semver-5.7.0.tgz",
+          "integrity": "sha512-Ya52jSX2u7QKghxeoFGpLwCtGlt7j0oY9DYb5apt9nPlJ42ID+ulTXESnt/qAQcoSERyZ5sl3LDIOw0nAn/5DA=="
+        }
       }
     },
     "normalize-package-data": {
@@ -5473,6 +5508,13 @@
         "is-builtin-module": "^1.0.0",
         "semver": "2 || 3 || 4 || 5",
         "validate-npm-package-license": "^3.0.1"
+      },
+      "dependencies": {
+        "semver": {
+          "version": "5.7.0",
+          "resolved": "https://registry.npmjs.org/semver/-/semver-5.7.0.tgz",
+          "integrity": "sha512-Ya52jSX2u7QKghxeoFGpLwCtGlt7j0oY9DYb5apt9nPlJ42ID+ulTXESnt/qAQcoSERyZ5sl3LDIOw0nAn/5DA=="
+        }
       }
     },
     "normalize-path": {
@@ -6689,9 +6731,10 @@
       "dev": true
     },
     "semver": {
-      "version": "5.6.0",
-      "resolved": "https://registry.npmjs.org/semver/-/semver-5.6.0.tgz",
-      "integrity": "sha512-RS9R6R35NYgQn++fkDWaOmqGoj4Ek9gGs+DPxNUZKuwE183xjJroKvyo1IzVFeXvUrvmALy6FWD5xrdJT25gMg=="
+      "version": "6.1.2",
+      "resolved": "https://registry.npmjs.org/semver/-/semver-6.1.2.tgz",
+      "integrity": "sha512-z4PqiCpomGtWj8633oeAdXm1Kn1W++3T8epkZYnwiVgIYIJ0QHszhInYSJTYxebByQH7KVCEAn8R9duzZW2PhQ==",
+      "dev": true
     },
     "semver-compare": {
       "version": "1.0.0",
diff --git a/package.json b/package.json
index fb9e6346..d139dce8 100644
--- a/package.json
+++ b/package.json
@@ -38,6 +38,7 @@
     "eslint-find-rules": "3.3.1",
     "execa": "1.0.0",
     "prettier": "1.18.2",
+    "semver": "^6.1.2",
     "tape": "4.10.2",
     "typescript": "3.5.2",
     "ybiq": "8.0.0"
diff --git a/test/e2e.test.js b/test/e2e.test.js
index 9143b399..72cd5de2 100644
--- a/test/e2e.test.js
+++ b/test/e2e.test.js
@@ -1,6 +1,7 @@
 const path = require("path");
 const fs = require("fs");
 const { EOL } = require("os");
+const semver = require("semver");
 const test = require("tape");
 const pkg = require("../package.json");
 const { sandbox, $, lintConfigFiles } = require("./helper");
@@ -21,16 +22,22 @@ cache-min=9999
 test("End-to-End", t => {
   const tarball = $("npm", "pack");
   const tarballPath = `file:${path.join(baseDir, tarball)}`;
+  const peerDeps = Object.entries(pkg.peerDependencies).map(([name, verRange]) => {
+    const ver = semver.valid(semver.coerce(verRange));
+    return `${name}@${ver}`;
+  });
 
-  sandbox(() => {
+  sandbox(cwd => {
     fs.writeFileSync(".npmrc", npmrc);
 
     $("npm", "init", "--yes", "--no-init-module");
-    $("npm", "install", ...Object.keys(pkg.peerDependencies), tarballPath);
+    $("npm", "install", ...peerDeps, tarballPath);
+
+    const eslint = path.join(cwd, "node_modules", ".bin", "eslint");
 
     writeESLintConfig({ extends: "ybiquitous" });
     writeLintTargetFile("process.stdout.write(1);");
-    $("eslint", ".");
+    $(eslint, ".");
     t.pass("default configuration");
 
     lintConfigFiles
@@ -39,12 +46,12 @@ test("End-to-End", t => {
         const configName = `ybiquitous/${path.basename(file, ".js")}`;
         writeESLintConfig({ extends: configName });
         writeLintTargetFile("process.stdout.write(1);");
-        $("eslint", ".");
+        $(eslint, ".");
         t.pass(`${configName} configuration`);
       });
 
     lintConfigFiles.forEach(file => {
-      $("eslint", "--print-config", path.join("node_modules", "eslint-config-ybiquitous", file));
+      $(eslint, "--print-config", path.join("node_modules", "eslint-config-ybiquitous", file));
       t.pass(`verify configuration for ${file}`);
     });
   });
diff --git a/test/helper.js b/test/helper.js
index 8908cc2c..cb3322a6 100644
--- a/test/helper.js
+++ b/test/helper.js
@@ -14,8 +14,8 @@ const log = msg => {
 };
 
 const $ = (cmd, ...args) => {
-  log(`> ${[cmd, ...args].join(" ")}`);
-  const { stdout } = execa.sync(cmd, args, { shell: true });
+  log(`> ${cmd} '${args.join("' '")}'`);
+  const { stdout } = execa.sync(cmd, args);
   const maxLines = 20;
   const lines = stdout.split(EOL);
   if (lines.length < maxLines) {