diff --git a/packages/amino/jasmine-testrunner.js b/packages/amino/jasmine-testrunner.cjs
similarity index 100%
rename from packages/amino/jasmine-testrunner.js
rename to packages/amino/jasmine-testrunner.cjs
diff --git a/packages/amino/package.json b/packages/amino/package.json
index 2f40d369fb..2b44c2818e 100644
--- a/packages/amino/package.json
+++ b/packages/amino/package.json
@@ -23,19 +23,19 @@
     "registry": "https://registry.npmjs.org"
   },
   "scripts": {
-    "docs": "typedoc --options typedoc.js",
+    "docs": "typedoc --options typedoc.cjs",
     "lint": "eslint --max-warnings 0 \"./**/*.ts\" \"./*.js\"",
     "lint-fix": "eslint --fix --max-warnings 0 \"./**/*.ts\" \"./*.js\"",
     "format": "prettier --write --log-level warn \"./src/**/*.ts\"",
     "format-text": "prettier --write \"./*.md\"",
-    "test-node": "yarn node jasmine-testrunner.js",
+    "test-node": "yarn node jasmine-testrunner.cjs",
     "test-firefox": "yarn pack-web && karma start --single-run --browsers Firefox karma.conf.cjs",
     "test-chrome": "yarn pack-web && karma start --single-run --browsers ChromeHeadless karma.conf.cjs",
     "test": "yarn build-or-skip && yarn test-node",
     "coverage": "nyc --reporter=text --reporter=lcov yarn test --quiet",
     "build": "rm -rf ./build && tsc",
     "build-or-skip": "[ -n \"$SKIP_BUILD\" ] || yarn build",
-    "pack-web": "yarn build-or-skip && webpack --mode development --config webpack.web.config.js"
+    "pack-web": "yarn build-or-skip && webpack --mode development --config webpack.web.config.cjs"
   },
   "dependencies": {
     "@cosmjs/crypto": "workspace:^",
diff --git a/packages/amino/typedoc.js b/packages/amino/typedoc.cjs
similarity index 100%
rename from packages/amino/typedoc.js
rename to packages/amino/typedoc.cjs
diff --git a/packages/amino/webpack.web.config.js b/packages/amino/webpack.web.config.cjs
similarity index 100%
rename from packages/amino/webpack.web.config.js
rename to packages/amino/webpack.web.config.cjs
diff --git a/packages/cosmwasm-stargate/jasmine-testrunner.js b/packages/cosmwasm-stargate/jasmine-testrunner.cjs
similarity index 100%
rename from packages/cosmwasm-stargate/jasmine-testrunner.js
rename to packages/cosmwasm-stargate/jasmine-testrunner.cjs
diff --git a/packages/cosmwasm-stargate/package.json b/packages/cosmwasm-stargate/package.json
index fa82c3ddf3..c47ccb9b40 100644
--- a/packages/cosmwasm-stargate/package.json
+++ b/packages/cosmwasm-stargate/package.json
@@ -23,19 +23,19 @@
     "registry": "https://registry.npmjs.org"
   },
   "scripts": {
-    "docs": "typedoc --options typedoc.js",
+    "docs": "typedoc --options typedoc.cjs",
     "format": "prettier --write --log-level warn \"./src/**/*.ts\"",
     "format-text": "prettier --write \"./*.md\"",
     "lint": "eslint --max-warnings 0 \"./**/*.ts\" \"./*.js\"",
     "lint-fix": "eslint --fix --max-warnings 0 \"./**/*.ts\" \"./*.js\"",
     "build": "rm -rf ./build && tsc",
     "build-or-skip": "[ -n \"$SKIP_BUILD\" ] || yarn build",
-    "test-node": "yarn node jasmine-testrunner.js",
+    "test-node": "yarn node jasmine-testrunner.cjs",
     "test-firefox": "yarn pack-web && karma start --single-run --browsers Firefox karma.conf.cjs",
     "test-chrome": "yarn pack-web && karma start --single-run --browsers ChromeHeadless karma.conf.cjs",
     "test": "yarn build-or-skip && yarn test-node",
     "coverage": "nyc --reporter=text --reporter=lcov yarn test --quiet",
-    "pack-web": "yarn build-or-skip && webpack --mode development --config webpack.web.config.js"
+    "pack-web": "yarn build-or-skip && webpack --mode development --config webpack.web.config.cjs"
   },
   "dependencies": {
     "@cosmjs/amino": "workspace:^",
diff --git a/packages/cosmwasm-stargate/typedoc.js b/packages/cosmwasm-stargate/typedoc.cjs
similarity index 100%
rename from packages/cosmwasm-stargate/typedoc.js
rename to packages/cosmwasm-stargate/typedoc.cjs
diff --git a/packages/cosmwasm-stargate/webpack.web.config.js b/packages/cosmwasm-stargate/webpack.web.config.cjs
similarity index 100%
rename from packages/cosmwasm-stargate/webpack.web.config.js
rename to packages/cosmwasm-stargate/webpack.web.config.cjs
diff --git a/packages/crypto/jasmine-testrunner.js b/packages/crypto/jasmine-testrunner.cjs
similarity index 100%
rename from packages/crypto/jasmine-testrunner.js
rename to packages/crypto/jasmine-testrunner.cjs
diff --git a/packages/crypto/package.json b/packages/crypto/package.json
index e8514306f6..c96653fdcc 100644
--- a/packages/crypto/package.json
+++ b/packages/crypto/package.json
@@ -24,19 +24,19 @@
     "registry": "https://registry.npmjs.org"
   },
   "scripts": {
-    "docs": "typedoc --options typedoc.js",
+    "docs": "typedoc --options typedoc.cjs",
     "lint": "eslint --max-warnings 0 \"./**/*.ts\" \"./*.js\"",
     "lint-fix": "eslint --fix --max-warnings 0 \"./**/*.ts\" \"./*.js\"",
     "format": "prettier --write --log-level warn \"./src/**/*.ts\"",
     "format-text": "prettier --write \"./*.md\"",
-    "test-node": "yarn node jasmine-testrunner.js",
+    "test-node": "yarn node jasmine-testrunner.cjs",
     "test-firefox": "yarn pack-web && karma start --single-run --browsers Firefox karma.conf.cjs",
     "test-chrome": "yarn pack-web && karma start --single-run --browsers ChromeHeadless karma.conf.cjs",
     "test": "yarn build-or-skip && yarn test-node",
     "coverage": "nyc --reporter=text --reporter=lcov yarn test --quiet",
     "build": "rm -rf ./build && tsc",
     "build-or-skip": "[ -n \"$SKIP_BUILD\" ] || yarn build",
-    "pack-web": "yarn build-or-skip && webpack --mode development --config webpack.web.config.js"
+    "pack-web": "yarn build-or-skip && webpack --mode development --config webpack.web.config.cjs"
   },
   "dependencies": {
     "@cosmjs/encoding": "workspace:^",
diff --git a/packages/crypto/typedoc.js b/packages/crypto/typedoc.cjs
similarity index 100%
rename from packages/crypto/typedoc.js
rename to packages/crypto/typedoc.cjs
diff --git a/packages/crypto/webpack.web.config.js b/packages/crypto/webpack.web.config.cjs
similarity index 100%
rename from packages/crypto/webpack.web.config.js
rename to packages/crypto/webpack.web.config.cjs
diff --git a/packages/encoding/jasmine-testrunner.js b/packages/encoding/jasmine-testrunner.cjs
similarity index 100%
rename from packages/encoding/jasmine-testrunner.js
rename to packages/encoding/jasmine-testrunner.cjs
diff --git a/packages/encoding/package.json b/packages/encoding/package.json
index abd43f70bd..8e444f01fb 100644
--- a/packages/encoding/package.json
+++ b/packages/encoding/package.json
@@ -23,19 +23,19 @@
     "registry": "https://registry.npmjs.org"
   },
   "scripts": {
-    "docs": "typedoc --options typedoc.js",
+    "docs": "typedoc --options typedoc.cjs",
     "lint": "eslint --max-warnings 0 \"./**/*.ts\" \"./*.js\"",
     "lint-fix": "eslint --fix --max-warnings 0 \"./**/*.ts\" \"./*.js\"",
     "format": "prettier --write --log-level warn \"./src/**/*.ts\"",
     "format-text": "prettier --write \"./*.md\"",
-    "test-node": "yarn node jasmine-testrunner.js",
+    "test-node": "yarn node jasmine-testrunner.cjs",
     "test-firefox": "yarn pack-web && karma start --single-run --browsers Firefox karma.conf.cjs",
     "test-chrome": "yarn pack-web && karma start --single-run --browsers ChromeHeadless karma.conf.cjs",
     "test": "yarn build-or-skip && yarn test-node",
     "coverage": "nyc --reporter=text --reporter=lcov yarn test --quiet",
     "build": "rm -rf ./build && tsc",
     "build-or-skip": "[ -n \"$SKIP_BUILD\" ] || yarn build",
-    "pack-web": "yarn build-or-skip && webpack --mode development --config webpack.web.config.js"
+    "pack-web": "yarn build-or-skip && webpack --mode development --config webpack.web.config.cjs"
   },
   "dependencies": {
     "base64-js": "^1.3.0",
diff --git a/packages/encoding/typedoc.js b/packages/encoding/typedoc.cjs
similarity index 100%
rename from packages/encoding/typedoc.js
rename to packages/encoding/typedoc.cjs
diff --git a/packages/encoding/webpack.web.config.js b/packages/encoding/webpack.web.config.cjs
similarity index 100%
rename from packages/encoding/webpack.web.config.js
rename to packages/encoding/webpack.web.config.cjs
diff --git a/packages/faucet-client/jasmine-testrunner.js b/packages/faucet-client/jasmine-testrunner.cjs
similarity index 100%
rename from packages/faucet-client/jasmine-testrunner.js
rename to packages/faucet-client/jasmine-testrunner.cjs
diff --git a/packages/faucet-client/package.json b/packages/faucet-client/package.json
index aaed8448bd..d6ddafd4b5 100644
--- a/packages/faucet-client/package.json
+++ b/packages/faucet-client/package.json
@@ -6,6 +6,7 @@
     "Will Clark <willclarktech@users.noreply.github.com>"
   ],
   "license": "Apache-2.0",
+  "type": "module",
   "main": "build/index.js",
   "types": "build/index.d.ts",
   "files": [
@@ -23,19 +24,19 @@
     "registry": "https://registry.npmjs.org"
   },
   "scripts": {
-    "docs": "typedoc --options typedoc.js",
+    "docs": "typedoc --options typedoc.cjs",
     "lint": "eslint --max-warnings 0 \"./**/*.ts\" \"./*.js\"",
     "lint-fix": "eslint --fix --max-warnings 0 \"./**/*.ts\" \"./*.js\"",
     "format": "prettier --write --log-level warn \"./src/**/*.ts\"",
     "format-text": "prettier --write \"./*.md\"",
-    "test-node": "yarn node jasmine-testrunner.js",
+    "test-node": "yarn node jasmine-testrunner.cjs",
     "test-firefox": "yarn pack-web && karma start --single-run --browsers Firefox karma.conf.cjs",
     "test-chrome": "yarn pack-web && karma start --single-run --browsers ChromeHeadless karma.conf.cjs",
     "test": "yarn build-or-skip && yarn test-node",
     "coverage": "nyc --reporter=text --reporter=lcov yarn test --quiet",
     "build": "rm -rf ./build && tsc",
     "build-or-skip": "[ -n \"$SKIP_BUILD\" ] || yarn build",
-    "pack-web": "yarn build-or-skip && webpack --mode development --config webpack.web.config.js"
+    "pack-web": "yarn build-or-skip && webpack --mode development --config webpack.web.config.cjs"
   },
   "dependencies": {
     "cross-fetch": "^4.1.0"
diff --git a/packages/faucet-client/src/faucetclient.spec.ts b/packages/faucet-client/src/faucetclient.spec.ts
index 9928123364..f49e6e13c1 100644
--- a/packages/faucet-client/src/faucetclient.spec.ts
+++ b/packages/faucet-client/src/faucetclient.spec.ts
@@ -1,4 +1,4 @@
-import { FaucetClient } from "./faucetclient";
+import { FaucetClient } from "./faucetclient.js";
 
 function pendingWithoutFaucet(): void {
   if (!process.env.FAUCET_ENABLED) {
@@ -42,7 +42,7 @@ describe("FaucetClient", () => {
     const faucet = new FaucetClient(faucetUrl);
     await faucet.credit(defaultAddress, "ETH").then(
       () => fail("must not resolve"),
-      (error) => expect(error).toMatch(/token is not available/i),
+      (error: any) => expect(error).toMatch(/token is not available/i),
     );
   });
 
@@ -53,7 +53,7 @@ describe("FaucetClient", () => {
     for (const address of ["be5cc2cc05db2cdb4313c18306a5157291cfdcd1", "1234L"]) {
       await faucet.credit(address, primaryToken).then(
         () => fail("must not resolve"),
-        (error) => expect(error).toMatch(/address is not in the expected format for this chain/i),
+        (error: any) => expect(error).toMatch(/address is not in the expected format for this chain/i),
       );
     }
   });
diff --git a/packages/faucet-client/src/index.ts b/packages/faucet-client/src/index.ts
index 7a2633a5ba..35f237dc3b 100644
--- a/packages/faucet-client/src/index.ts
+++ b/packages/faucet-client/src/index.ts
@@ -1 +1 @@
-export { FaucetClient } from "./faucetclient";
+export { FaucetClient } from "./faucetclient.js";
diff --git a/packages/faucet-client/typedoc.js b/packages/faucet-client/typedoc.cjs
similarity index 100%
rename from packages/faucet-client/typedoc.js
rename to packages/faucet-client/typedoc.cjs
diff --git a/packages/faucet-client/webpack.web.config.js b/packages/faucet-client/webpack.web.config.cjs
similarity index 100%
rename from packages/faucet-client/webpack.web.config.js
rename to packages/faucet-client/webpack.web.config.cjs
diff --git a/packages/faucet/jasmine-testrunner.js b/packages/faucet/jasmine-testrunner.cjs
similarity index 100%
rename from packages/faucet/jasmine-testrunner.js
rename to packages/faucet/jasmine-testrunner.cjs
diff --git a/packages/faucet/package.json b/packages/faucet/package.json
index 88ab00ddad..a77d99f801 100644
--- a/packages/faucet/package.json
+++ b/packages/faucet/package.json
@@ -33,7 +33,7 @@
     "lint-fix": "eslint --fix --max-warnings 0 \"./**/*.ts\" \"./*.js\"",
     "build": "rm -rf ./build && tsc",
     "build-or-skip": "[ -n \"$SKIP_BUILD\" ] || yarn build",
-    "test-node": "yarn node jasmine-testrunner.js",
+    "test-node": "yarn node jasmine-testrunner.cjs",
     "test": "yarn build-or-skip && yarn test-node",
     "coverage": "nyc --reporter=text --reporter=lcov yarn test --quiet",
     "start-dev": "FAUCET_ADDRESS_PREFIX=wasm FAUCET_CREDIT_AMOUNT_UCOSM=10000000 FAUCET_CREDIT_AMOUNT_USTAKE=100000 FAUCET_CONCURRENCY=3 FAUCET_MNEMONIC=\"economy stock theory fatal elder harbor betray wasp final emotion task crumble siren bottom lizard educate guess current outdoor pair theory focus wife stone\" ./bin/cosmos-faucet start \"http://localhost:26659\"",
diff --git a/packages/faucet/typedoc.js b/packages/faucet/typedoc.cjs
similarity index 100%
rename from packages/faucet/typedoc.js
rename to packages/faucet/typedoc.cjs
diff --git a/packages/faucet/webpack.node.config.js b/packages/faucet/webpack.web.config.cjs
similarity index 100%
rename from packages/faucet/webpack.node.config.js
rename to packages/faucet/webpack.web.config.cjs
diff --git a/packages/json-rpc/jasmine-testrunner.js b/packages/json-rpc/jasmine-testrunner.cjs
similarity index 100%
rename from packages/json-rpc/jasmine-testrunner.js
rename to packages/json-rpc/jasmine-testrunner.cjs
diff --git a/packages/json-rpc/package.json b/packages/json-rpc/package.json
index bf09295bba..a32f62840f 100644
--- a/packages/json-rpc/package.json
+++ b/packages/json-rpc/package.json
@@ -25,19 +25,19 @@
     "registry": "https://registry.npmjs.org"
   },
   "scripts": {
-    "docs": "typedoc --options typedoc.js",
+    "docs": "typedoc --options typedoc.cjs",
     "lint": "eslint --max-warnings 0 \"./**/*.ts\" \"./*.js\"",
     "lint-fix": "eslint --fix --max-warnings 0 \"./**/*.ts\" \"./*.js\"",
     "format": "prettier --write --log-level warn \"./src/**/*.ts\"",
     "format-text": "prettier --write \"./*.md\"",
-    "test-node": "yarn node jasmine-testrunner.js",
+    "test-node": "yarn node jasmine-testrunner.cjs",
     "test-firefox": "yarn pack-web && karma start --single-run --browsers Firefox karma.conf.cjs",
     "test-chrome": "yarn pack-web && karma start --single-run --browsers ChromeHeadless karma.conf.cjs",
     "test": "yarn build-or-skip && yarn test-node",
     "coverage": "nyc --reporter=text --reporter=lcov yarn test --quiet",
     "build": "rm -rf ./build && tsc && tsc -p src/workers/tsconfig.json",
     "build-or-skip": "[ -n \"$SKIP_BUILD\" ] || yarn build",
-    "pack-web": "yarn build-or-skip && webpack --mode development --config webpack.web.config.js"
+    "pack-web": "yarn build-or-skip && webpack --mode development --config webpack.web.config.cjs"
   },
   "dependencies": {
     "@cosmjs/stream": "workspace:^",
diff --git a/packages/json-rpc/typedoc.js b/packages/json-rpc/typedoc.cjs
similarity index 100%
rename from packages/json-rpc/typedoc.js
rename to packages/json-rpc/typedoc.cjs
diff --git a/packages/json-rpc/webpack.web.config.js b/packages/json-rpc/webpack.web.config.cjs
similarity index 100%
rename from packages/json-rpc/webpack.web.config.js
rename to packages/json-rpc/webpack.web.config.cjs
diff --git a/packages/ledger-amino/jasmine-testrunner.js b/packages/ledger-amino/jasmine-testrunner.cjs
similarity index 100%
rename from packages/ledger-amino/jasmine-testrunner.js
rename to packages/ledger-amino/jasmine-testrunner.cjs
diff --git a/packages/ledger-amino/package.json b/packages/ledger-amino/package.json
index 367f0c090d..f0d0782582 100644
--- a/packages/ledger-amino/package.json
+++ b/packages/ledger-amino/package.json
@@ -23,14 +23,14 @@
     "registry": "https://registry.npmjs.org"
   },
   "scripts": {
-    "docs": "typedoc --options typedoc.js",
+    "docs": "typedoc --options typedoc.cjs",
     "format": "prettier --write --log-level warn \"./src/**/*.ts\"",
     "format-text": "prettier --write \"./*.md\"",
     "lint": "eslint --max-warnings 0 \"./**/*.ts\" \"./{,demo/}*.js\"",
     "lint-fix": "eslint --fix --max-warnings 0 \"./**/*.ts\" \"./{,demo/}*.js\"",
     "build": "rm -rf ./build && tsc",
     "build-or-skip": "[ -n \"$SKIP_BUILD\" ] || yarn build",
-    "test-node": "yarn node jasmine-testrunner.js",
+    "test-node": "yarn node jasmine-testrunner.cjs",
     "test": "yarn build-or-skip && yarn test-node",
     "demo-node": "yarn build-or-skip && node ./demo/node.js",
     "coverage": "nyc --reporter=text --reporter=lcov yarn test --quiet",
diff --git a/packages/ledger-amino/typedoc.js b/packages/ledger-amino/typedoc.cjs
similarity index 100%
rename from packages/ledger-amino/typedoc.js
rename to packages/ledger-amino/typedoc.cjs
diff --git a/packages/ledger-amino/webpack.demo.config.js b/packages/ledger-amino/webpack.web.config.cjs
similarity index 100%
rename from packages/ledger-amino/webpack.demo.config.js
rename to packages/ledger-amino/webpack.web.config.cjs
diff --git a/packages/math/jasmine-testrunner.js b/packages/math/jasmine-testrunner.cjs
similarity index 100%
rename from packages/math/jasmine-testrunner.js
rename to packages/math/jasmine-testrunner.cjs
diff --git a/packages/math/package.json b/packages/math/package.json
index 64ada0bcc8..bf703e3f02 100644
--- a/packages/math/package.json
+++ b/packages/math/package.json
@@ -23,19 +23,19 @@
     "registry": "https://registry.npmjs.org"
   },
   "scripts": {
-    "docs": "typedoc --options typedoc.js",
+    "docs": "typedoc --options typedoc.cjs",
     "lint": "eslint --max-warnings 0 \"./**/*.ts\" \"./*.js\"",
     "lint-fix": "eslint --fix --max-warnings 0 \"./**/*.ts\" \"./*.js\"",
     "format": "prettier --write --log-level warn \"./src/**/*.ts\"",
     "format-text": "prettier --write \"./*.md\"",
-    "test-node": "yarn node jasmine-testrunner.js",
+    "test-node": "yarn node jasmine-testrunner.cjs",
     "test-firefox": "yarn pack-web && karma start --single-run --browsers Firefox karma.conf.cjs",
     "test-chrome": "yarn pack-web && karma start --single-run --browsers ChromeHeadless karma.conf.cjs",
     "test": "yarn build-or-skip && yarn test-node",
     "coverage": "nyc --reporter=text --reporter=lcov yarn test --quiet",
     "build": "rm -rf ./build && tsc",
     "build-or-skip": "[ -n \"$SKIP_BUILD\" ] || yarn build",
-    "pack-web": "yarn build-or-skip && webpack --mode development --config webpack.web.config.js"
+    "pack-web": "yarn build-or-skip && webpack --mode development --config webpack.web.config.cjs"
   },
   "devDependencies": {
     "@istanbuljs/nyc-config-typescript": "^1.0.1",
diff --git a/packages/math/typedoc.js b/packages/math/typedoc.cjs
similarity index 100%
rename from packages/math/typedoc.js
rename to packages/math/typedoc.cjs
diff --git a/packages/math/webpack.web.config.js b/packages/math/webpack.web.config.cjs
similarity index 100%
rename from packages/math/webpack.web.config.js
rename to packages/math/webpack.web.config.cjs
diff --git a/packages/proto-signing/jasmine-testrunner.js b/packages/proto-signing/jasmine-testrunner.cjs
similarity index 100%
rename from packages/proto-signing/jasmine-testrunner.js
rename to packages/proto-signing/jasmine-testrunner.cjs
diff --git a/packages/proto-signing/package.json b/packages/proto-signing/package.json
index 51d5bdaef0..8c08dbe476 100644
--- a/packages/proto-signing/package.json
+++ b/packages/proto-signing/package.json
@@ -24,19 +24,19 @@
     "registry": "https://registry.npmjs.org"
   },
   "scripts": {
-    "docs": "typedoc --options typedoc.js",
+    "docs": "typedoc --options typedoc.cjs",
     "format": "prettier --write --log-level warn \"./src/**/*.ts\"",
     "format-text": "prettier --write \"./*.md\"",
     "lint": "eslint --max-warnings 0 \"./**/*.ts\" \"./*.js\"",
     "lint-fix": "eslint --fix --max-warnings 0 \"./**/*.ts\" \"./*.js\"",
     "build": "rm -rf ./build && tsc",
     "build-or-skip": "[ -n \"$SKIP_BUILD\" ] || yarn build",
-    "test-node": "yarn node jasmine-testrunner.js",
+    "test-node": "yarn node jasmine-testrunner.cjs",
     "test-firefox": "yarn pack-web && karma start --single-run --browsers Firefox karma.conf.cjs",
     "test-chrome": "yarn pack-web && karma start --single-run --browsers ChromeHeadless karma.conf.cjs",
     "test": "yarn build-or-skip && yarn test-node",
     "coverage": "nyc --reporter=text --reporter=lcov yarn test --quiet",
-    "pack-web": "yarn build-or-skip && webpack --mode development --config webpack.web.config.js"
+    "pack-web": "yarn build-or-skip && webpack --mode development --config webpack.web.config.cjs"
   },
   "dependencies": {
     "@cosmjs/amino": "workspace:^",
diff --git a/packages/proto-signing/typedoc.js b/packages/proto-signing/typedoc.cjs
similarity index 100%
rename from packages/proto-signing/typedoc.js
rename to packages/proto-signing/typedoc.cjs
diff --git a/packages/proto-signing/webpack.web.config.js b/packages/proto-signing/webpack.web.config.cjs
similarity index 100%
rename from packages/proto-signing/webpack.web.config.js
rename to packages/proto-signing/webpack.web.config.cjs
diff --git a/packages/socket/jasmine-testrunner.js b/packages/socket/jasmine-testrunner.cjs
similarity index 100%
rename from packages/socket/jasmine-testrunner.js
rename to packages/socket/jasmine-testrunner.cjs
diff --git a/packages/socket/package.json b/packages/socket/package.json
index ea7310af13..eaa582b5fd 100644
--- a/packages/socket/package.json
+++ b/packages/socket/package.json
@@ -25,19 +25,19 @@
     "registry": "https://registry.npmjs.org"
   },
   "scripts": {
-    "docs": "typedoc --options typedoc.js",
+    "docs": "typedoc --options typedoc.cjs",
     "lint": "eslint --max-warnings 0 \"./**/*.ts\" \"./*.js\"",
     "lint-fix": "eslint --fix --max-warnings 0 \"./**/*.ts\" \"./*.js\"",
     "format": "prettier --write --log-level warn \"./src/**/*.ts\"",
     "format-text": "prettier --write \"./*.md\"",
-    "test-node": "yarn node jasmine-testrunner.js",
+    "test-node": "yarn node jasmine-testrunner.cjs",
     "test-firefox": "yarn pack-web && karma start --single-run --browsers Firefox karma.conf.cjs",
     "test-chrome": "yarn pack-web && karma start --single-run --browsers ChromeHeadless karma.conf.cjs",
     "test": "yarn build-or-skip && yarn test-node",
     "coverage": "nyc --reporter=text --reporter=lcov yarn test --quiet",
     "build": "rm -rf ./build && tsc",
     "build-or-skip": "[ -n \"$SKIP_BUILD\" ] || yarn build",
-    "pack-web": "yarn build-or-skip && webpack --mode development --config webpack.web.config.js"
+    "pack-web": "yarn build-or-skip && webpack --mode development --config webpack.web.config.cjs"
   },
   "dependencies": {
     "@cosmjs/stream": "workspace:^",
diff --git a/packages/socket/typedoc.js b/packages/socket/typedoc.cjs
similarity index 100%
rename from packages/socket/typedoc.js
rename to packages/socket/typedoc.cjs
diff --git a/packages/socket/webpack.web.config.js b/packages/socket/webpack.web.config.cjs
similarity index 100%
rename from packages/socket/webpack.web.config.js
rename to packages/socket/webpack.web.config.cjs
diff --git a/packages/stargate/jasmine-testrunner.js b/packages/stargate/jasmine-testrunner.cjs
similarity index 100%
rename from packages/stargate/jasmine-testrunner.js
rename to packages/stargate/jasmine-testrunner.cjs
diff --git a/packages/stargate/package.json b/packages/stargate/package.json
index aeb276fd27..e6e6da19ec 100644
--- a/packages/stargate/package.json
+++ b/packages/stargate/package.json
@@ -23,19 +23,19 @@
     "registry": "https://registry.npmjs.org"
   },
   "scripts": {
-    "docs": "typedoc --options typedoc.js",
+    "docs": "typedoc --options typedoc.cjs",
     "lint": "eslint --max-warnings 0 \"./**/*.ts\" \"./*.js\"",
     "lint-fix": "eslint --fix --max-warnings 0 \"./**/*.ts\" \"./*.js\"",
     "format": "prettier --write --log-level warn \"./src/**/*.ts\"",
     "format-text": "prettier --write \"./*.md\"",
     "build": "rm -rf ./build && tsc",
     "build-or-skip": "[ -n \"$SKIP_BUILD\" ] || yarn build",
-    "test-node": "yarn node jasmine-testrunner.js",
+    "test-node": "yarn node jasmine-testrunner.cjs",
     "test-firefox": "yarn pack-web && karma start --single-run --browsers Firefox karma.conf.cjs",
     "test-chrome": "yarn pack-web && karma start --single-run --browsers ChromeHeadless karma.conf.cjs",
     "test": "yarn build-or-skip && yarn test-node",
     "coverage": "nyc --reporter=text --reporter=lcov yarn test --quiet",
-    "pack-web": "yarn build-or-skip && webpack --mode development --config webpack.web.config.js"
+    "pack-web": "yarn build-or-skip && webpack --mode development --config webpack.web.config.cjs"
   },
   "dependencies": {
     "@cosmjs/amino": "workspace:^",
diff --git a/packages/stargate/typedoc.js b/packages/stargate/typedoc.cjs
similarity index 100%
rename from packages/stargate/typedoc.js
rename to packages/stargate/typedoc.cjs
diff --git a/packages/stargate/webpack.web.config.js b/packages/stargate/webpack.web.config.cjs
similarity index 100%
rename from packages/stargate/webpack.web.config.js
rename to packages/stargate/webpack.web.config.cjs
diff --git a/packages/stream/jasmine-testrunner.js b/packages/stream/jasmine-testrunner.cjs
similarity index 100%
rename from packages/stream/jasmine-testrunner.js
rename to packages/stream/jasmine-testrunner.cjs
diff --git a/packages/stream/package.json b/packages/stream/package.json
index decbcefcb2..f4cfc60f14 100644
--- a/packages/stream/package.json
+++ b/packages/stream/package.json
@@ -25,19 +25,19 @@
     "registry": "https://registry.npmjs.org"
   },
   "scripts": {
-    "docs": "typedoc --options typedoc.js",
+    "docs": "typedoc --options typedoc.cjs",
     "lint": "eslint --max-warnings 0 \"./**/*.ts\" \"./*.js\"",
     "lint-fix": "eslint --fix --max-warnings 0 \"./**/*.ts\" \"./*.js\"",
     "format": "prettier --write --log-level warn \"./src/**/*.ts\"",
     "format-text": "prettier --write \"./*.md\"",
-    "test-node": "yarn node jasmine-testrunner.js",
+    "test-node": "yarn node jasmine-testrunner.cjs",
     "test-firefox": "yarn pack-web && karma start --single-run --browsers Firefox karma.conf.cjs",
     "test-chrome": "yarn pack-web && karma start --single-run --browsers ChromeHeadless karma.conf.cjs",
     "test": "yarn build-or-skip && yarn test-node",
     "coverage": "nyc --reporter=text --reporter=lcov yarn test --quiet",
     "build": "rm -rf ./build && tsc",
     "build-or-skip": "[ -n \"$SKIP_BUILD\" ] || yarn build",
-    "pack-web": "yarn build-or-skip && webpack --mode development --config webpack.web.config.js"
+    "pack-web": "yarn build-or-skip && webpack --mode development --config webpack.web.config.cjs"
   },
   "dependencies": {
     "xstream": "^11.14.0"
diff --git a/packages/stream/typedoc.js b/packages/stream/typedoc.cjs
similarity index 100%
rename from packages/stream/typedoc.js
rename to packages/stream/typedoc.cjs
diff --git a/packages/stream/webpack.web.config.js b/packages/stream/webpack.web.config.cjs
similarity index 100%
rename from packages/stream/webpack.web.config.js
rename to packages/stream/webpack.web.config.cjs
diff --git a/packages/tendermint-rpc/jasmine-testrunner.js b/packages/tendermint-rpc/jasmine-testrunner.cjs
similarity index 100%
rename from packages/tendermint-rpc/jasmine-testrunner.js
rename to packages/tendermint-rpc/jasmine-testrunner.cjs
diff --git a/packages/tendermint-rpc/package.json b/packages/tendermint-rpc/package.json
index ecf776b42d..028a8d372d 100644
--- a/packages/tendermint-rpc/package.json
+++ b/packages/tendermint-rpc/package.json
@@ -25,19 +25,19 @@
     "registry": "https://registry.npmjs.org"
   },
   "scripts": {
-    "docs": "typedoc --options typedoc.js",
+    "docs": "typedoc --options typedoc.cjs",
     "lint": "eslint --max-warnings 0 \"./**/*.ts\" \"./*.js\"",
     "lint-fix": "eslint --fix --max-warnings 0 \"./**/*.ts\" \"./*.js\"",
     "format": "prettier --write --log-level warn \"./src/**/*.ts\"",
     "format-text": "prettier --write \"./*.md\"",
-    "test-node": "yarn node jasmine-testrunner.js",
+    "test-node": "yarn node jasmine-testrunner.cjs",
     "test-firefox": "yarn pack-web && karma start --single-run --browsers Firefox karma.conf.cjs",
     "test-chrome": "yarn pack-web && karma start --single-run --browsers ChromeHeadless karma.conf.cjs",
     "test": "yarn build-or-skip && yarn test-node",
     "coverage": "nyc --reporter=text --reporter=lcov yarn test --quiet",
     "build": "rm -rf ./build && tsc",
     "build-or-skip": "[ -n \"$SKIP_BUILD\" ] || yarn build",
-    "pack-web": "yarn build-or-skip && webpack --mode development --config webpack.web.config.js"
+    "pack-web": "yarn build-or-skip && webpack --mode development --config webpack.web.config.cjs"
   },
   "dependencies": {
     "@cosmjs/crypto": "workspace:^",
diff --git a/packages/tendermint-rpc/typedoc.js b/packages/tendermint-rpc/typedoc.cjs
similarity index 100%
rename from packages/tendermint-rpc/typedoc.js
rename to packages/tendermint-rpc/typedoc.cjs
diff --git a/packages/tendermint-rpc/webpack.web.config.js b/packages/tendermint-rpc/webpack.web.config.cjs
similarity index 100%
rename from packages/tendermint-rpc/webpack.web.config.js
rename to packages/tendermint-rpc/webpack.web.config.cjs
diff --git a/packages/utils/jasmine-testrunner.js b/packages/utils/jasmine-testrunner.cjs
similarity index 100%
rename from packages/utils/jasmine-testrunner.js
rename to packages/utils/jasmine-testrunner.cjs
diff --git a/packages/utils/package.json b/packages/utils/package.json
index be533f94de..0cdcc3f36e 100644
--- a/packages/utils/package.json
+++ b/packages/utils/package.json
@@ -23,17 +23,17 @@
     "registry": "https://registry.npmjs.org"
   },
   "scripts": {
-    "docs": "typedoc --options typedoc.js",
+    "docs": "typedoc --options typedoc.cjs",
     "lint": "eslint --max-warnings 0 \"./**/*.ts\" \"./*.js\"",
     "lint-fix": "eslint --fix --max-warnings 0 \"./**/*.ts\" \"./*.js\"",
     "format": "prettier --write --log-level warn \"./src/**/*.ts\"",
     "format-text": "prettier --write \"./*.md\"",
     "build": "rm -rf ./build && tsc",
     "build-or-skip": "[ -n \"$SKIP_BUILD\" ] || yarn build",
-    "test-node": "yarn node jasmine-testrunner.js",
+    "test-node": "yarn node jasmine-testrunner.cjs",
     "test": "yarn build-or-skip && yarn test-node",
     "coverage": "nyc --reporter=text --reporter=lcov yarn test --quiet",
-    "pack-web": "yarn build-or-skip && webpack --mode development --config webpack.web.config.js",
+    "pack-web": "yarn build-or-skip && webpack --mode development --config webpack.web.config.cjs",
     "test-firefox": "yarn pack-web && karma start --single-run --browsers Firefox karma.conf.cjs",
     "test-chrome": "yarn pack-web && karma start --single-run --browsers ChromeHeadless karma.conf.cjs"
   },
diff --git a/packages/utils/typedoc.js b/packages/utils/typedoc.cjs
similarity index 100%
rename from packages/utils/typedoc.js
rename to packages/utils/typedoc.cjs
diff --git a/packages/utils/webpack.web.config.js b/packages/utils/webpack.web.config.cjs
similarity index 100%
rename from packages/utils/webpack.web.config.js
rename to packages/utils/webpack.web.config.cjs
diff --git a/tsconfig.json b/tsconfig.json
index c94d2ce2c7..c53e6df5dd 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -4,10 +4,10 @@
     "declaration": true,
     "esModuleInterop": true,
     "forceConsistentCasingInFileNames": true,
-    "lib": ["es2020"],
-    "target": "es2020",
-    "module": "commonjs",
-    "moduleResolution": "node",
+    "lib": ["es2022"],
+    "target": "es2022",
+    "module": "nodenext",
+    "moduleResolution": "nodenext",
     "newLine": "LF",
     "noEmitOnError": true,
     "noFallthroughCasesInSwitch": true,