diff --git a/babel.config.js b/babel.config.cjs
similarity index 100%
rename from babel.config.js
rename to babel.config.cjs
diff --git a/jest.config.js b/jest.config.cjs
similarity index 92%
rename from jest.config.js
rename to jest.config.cjs
index c3711ef9d9..2c7f89b15e 100644
--- a/jest.config.js
+++ b/jest.config.cjs
@@ -26,5 +26,5 @@ module.exports = Object.assign({}, config, {
     '<rootDir>/packages/types/build',
     '<rootDir>/packages/types-known/build'
   ],
-  resolver: '@polkadot/dev/config/jest-resolver.cjs'
+  transformIgnorePatterns: ['/node_modules/(?!@polkadot|@babel/runtime/helpers/esm/|rxjs/_esm5)']
 });
diff --git a/package.json b/package.json
index 32a28349aa..61ef3fb412 100644
--- a/package.json
+++ b/package.json
@@ -28,11 +28,11 @@
     "@babel/core": "^7.13.8",
     "@babel/register": "^7.13.8",
     "@babel/runtime": "^7.13.8",
-    "@polkadot/dev": "^0.61.31",
+    "@polkadot/dev": "^0.62.2",
     "@polkadot/ts": "^0.3.60",
     "@polkadot/typegen": "workspace:packages/typegen",
     "@types/jest": "^26.0.20",
     "copyfiles": "^2.4.1"
   },
-  "version": "3.11.2-4"
+  "version": "4.0.1-2"
 }
diff --git a/packages/api-contract/package.json b/packages/api-contract/package.json
index 6d5d20eac0..78edc896be 100644
--- a/packages/api-contract/package.json
+++ b/packages/api-contract/package.json
@@ -1,11 +1,12 @@
 {
   "name": "@polkadot/api-contract",
-  "version": "3.11.2-4",
+  "version": "4.0.1-2",
+  "type": "module",
   "description": "Interfaces for interacting with contracts and contract ABIs",
   "main": "index.js",
   "sideEffects": [
     "./detectPackage.js",
-    "./detectPackage.mjs"
+    "./detectPackage.cjs"
   ],
   "author": "Jaco Greeff <jacogr@gmail.com>",
   "maintainers": [],
@@ -16,10 +17,10 @@
   "homepage": "https://github.com/polkadot-js/api/tree/master/packages/api-contract#readme",
   "dependencies": {
     "@babel/runtime": "^7.13.8",
-    "@polkadot/api": "3.11.2-4",
-    "@polkadot/types": "3.11.2-4",
-    "@polkadot/util": "^5.9.2",
-    "@polkadot/x-rxjs": "^5.9.2",
+    "@polkadot/api": "4.0.1-2",
+    "@polkadot/types": "4.0.1-2",
+    "@polkadot/util": "^6.0.1-4",
+    "@polkadot/x-rxjs": "^6.0.1-4",
     "bn.js": "^4.11.9"
   }
 }
diff --git a/packages/api-contract/src/packageInfo.ts b/packages/api-contract/src/packageInfo.ts
index 2ca86e0d41..23e9d36484 100644
--- a/packages/api-contract/src/packageInfo.ts
+++ b/packages/api-contract/src/packageInfo.ts
@@ -1,6 +1,6 @@
-// Copyright 2017-2021 @polkadot/dev authors & contributors
+// Copyright 2017-2021 @polkadot/api-contract authors & contributors
 // SPDX-License-Identifier: Apache-2.0
 
 // Auto-generated by @polkadot/dev, do not edit
 
-export const packageInfo = { name: '@polkadot/api-contract', version: '3.11.2-4' };
+export const packageInfo = { name: '@polkadot/api-contract', version: '4.0.0-1' };
diff --git a/packages/api-derive/package.json b/packages/api-derive/package.json
index 8dfd8d7bed..1b050a1d7a 100644
--- a/packages/api-derive/package.json
+++ b/packages/api-derive/package.json
@@ -1,11 +1,12 @@
 {
   "name": "@polkadot/api-derive",
-  "version": "3.11.2-4",
+  "version": "4.0.1-2",
+  "type": "module",
   "description": "Common functions used across Polkadot, derived from RPC calls and storage queries.",
   "main": "index.js",
   "sideEffects": [
     "./detectPackage.js",
-    "./detectPackage.mjs"
+    "./detectPackage.cjs"
   ],
   "author": "Jaco Greeff <jacogr@gmail.com>",
   "maintainers": [],
@@ -16,16 +17,16 @@
   "homepage": "https://github.com/polkadot-js/api/tree/master/packages/api-derive#readme",
   "dependencies": {
     "@babel/runtime": "^7.13.8",
-    "@polkadot/api": "3.11.2-4",
-    "@polkadot/rpc-core": "3.11.2-4",
-    "@polkadot/types": "3.11.2-4",
-    "@polkadot/util": "^5.9.2",
-    "@polkadot/util-crypto": "^5.9.2",
-    "@polkadot/x-rxjs": "^5.9.2",
+    "@polkadot/api": "4.0.1-2",
+    "@polkadot/rpc-core": "4.0.1-2",
+    "@polkadot/types": "4.0.1-2",
+    "@polkadot/util": "^6.0.1-4",
+    "@polkadot/util-crypto": "^6.0.1-4",
+    "@polkadot/x-rxjs": "^6.0.1-4",
     "bn.js": "^4.11.9"
   },
   "devDependencies": {
-    "@polkadot/keyring": "^5.9.2",
-    "@polkadot/rpc-provider": "3.11.2-4"
+    "@polkadot/keyring": "^6.0.1-4",
+    "@polkadot/rpc-provider": "4.0.1-2"
   }
 }
diff --git a/packages/api-derive/src/packageInfo.ts b/packages/api-derive/src/packageInfo.ts
index 9fe359b027..e402489c86 100644
--- a/packages/api-derive/src/packageInfo.ts
+++ b/packages/api-derive/src/packageInfo.ts
@@ -1,6 +1,6 @@
-// Copyright 2017-2021 @polkadot/dev authors & contributors
+// Copyright 2017-2021 @polkadot/api-derive authors & contributors
 // SPDX-License-Identifier: Apache-2.0
 
 // Auto-generated by @polkadot/dev, do not edit
 
-export const packageInfo = { name: '@polkadot/api-derive', version: '3.11.2-4' };
+export const packageInfo = { name: '@polkadot/api-derive', version: '4.0.0-1' };
diff --git a/packages/api/package.json b/packages/api/package.json
index a9b2ee842c..fed0186316 100644
--- a/packages/api/package.json
+++ b/packages/api/package.json
@@ -1,11 +1,12 @@
 {
   "name": "@polkadot/api",
-  "version": "3.11.2-4",
+  "version": "4.0.1-2",
+  "type": "module",
   "description": "Promise and RxJS wrappers around the Polkadot JS RPC",
   "main": "index.js",
   "sideEffects": [
     "./detectPackage.js",
-    "./detectPackage.mjs"
+    "./detectPackage.cjs"
   ],
   "author": "Jaco Greeff <jacogr@gmail.com>",
   "maintainers": [],
@@ -16,16 +17,16 @@
   "homepage": "https://github.com/polkadot-js/api/tree/master/packages/api#readme",
   "dependencies": {
     "@babel/runtime": "^7.13.8",
-    "@polkadot/api-derive": "3.11.2-4",
-    "@polkadot/keyring": "^5.9.2",
-    "@polkadot/metadata": "3.11.2-4",
-    "@polkadot/rpc-core": "3.11.2-4",
-    "@polkadot/rpc-provider": "3.11.2-4",
-    "@polkadot/types": "3.11.2-4",
-    "@polkadot/types-known": "3.11.2-4",
-    "@polkadot/util": "^5.9.2",
-    "@polkadot/util-crypto": "^5.9.2",
-    "@polkadot/x-rxjs": "^5.9.2",
+    "@polkadot/api-derive": "4.0.1-2",
+    "@polkadot/keyring": "^6.0.1-4",
+    "@polkadot/metadata": "4.0.1-2",
+    "@polkadot/rpc-core": "4.0.1-2",
+    "@polkadot/rpc-provider": "4.0.1-2",
+    "@polkadot/types": "4.0.1-2",
+    "@polkadot/types-known": "4.0.1-2",
+    "@polkadot/util": "^6.0.1-4",
+    "@polkadot/util-crypto": "^6.0.1-4",
+    "@polkadot/x-rxjs": "^6.0.1-4",
     "bn.js": "^4.11.9",
     "eventemitter3": "^4.0.7"
   }
diff --git a/packages/api/src/packageInfo.ts b/packages/api/src/packageInfo.ts
index aa6620cf9f..e97a965ed0 100644
--- a/packages/api/src/packageInfo.ts
+++ b/packages/api/src/packageInfo.ts
@@ -1,6 +1,6 @@
-// Copyright 2017-2021 @polkadot/dev authors & contributors
+// Copyright 2017-2021 @polkadot/api authors & contributors
 // SPDX-License-Identifier: Apache-2.0
 
 // Auto-generated by @polkadot/dev, do not edit
 
-export const packageInfo = { name: '@polkadot/api', version: '3.11.2-4' };
+export const packageInfo = { name: '@polkadot/api', version: '4.0.0-1' };
diff --git a/packages/metadata/package.json b/packages/metadata/package.json
index 0936af5a3e..ae511187ae 100644
--- a/packages/metadata/package.json
+++ b/packages/metadata/package.json
@@ -1,11 +1,12 @@
 {
   "name": "@polkadot/metadata",
-  "version": "3.11.2-4",
+  "version": "4.0.1-2",
+  "type": "module",
   "description": "Helpers to extract information from runtime metadata",
   "main": "index.js",
   "sideEffects": [
     "./detectPackage.js",
-    "./detectPackage.mjs"
+    "./detectPackage.cjs"
   ],
   "repository": "github:polkadot-js/api",
   "author": "Jaco Greeff <jacogr@gmail.com>",
@@ -16,13 +17,13 @@
   "homepage": "https://github.com/polkadot-js/api/tree/master/packages/type-metadata#readme",
   "dependencies": {
     "@babel/runtime": "^7.13.8",
-    "@polkadot/types": "3.11.2-4",
-    "@polkadot/types-known": "3.11.2-4",
-    "@polkadot/util": "^5.9.2",
-    "@polkadot/util-crypto": "^5.9.2",
+    "@polkadot/types": "4.0.1-2",
+    "@polkadot/types-known": "4.0.1-2",
+    "@polkadot/util": "^6.0.1-4",
+    "@polkadot/util-crypto": "^6.0.1-4",
     "bn.js": "^4.11.9"
   },
   "devDependencies": {
-    "@polkadot/keyring": "^5.9.2"
+    "@polkadot/keyring": "^6.0.1-4"
   }
 }
diff --git a/packages/metadata/src/packageInfo.ts b/packages/metadata/src/packageInfo.ts
index 724775a8c4..1c7c5fa873 100644
--- a/packages/metadata/src/packageInfo.ts
+++ b/packages/metadata/src/packageInfo.ts
@@ -1,6 +1,6 @@
-// Copyright 2017-2021 @polkadot/dev authors & contributors
+// Copyright 2017-2021 @polkadot/metadata authors & contributors
 // SPDX-License-Identifier: Apache-2.0
 
 // Auto-generated by @polkadot/dev, do not edit
 
-export const packageInfo = { name: '@polkadot/metadata', version: '3.11.2-4' };
+export const packageInfo = { name: '@polkadot/metadata', version: '4.0.0-1' };
diff --git a/packages/rpc-core/package.json b/packages/rpc-core/package.json
index b14c83fe1f..c76c1b02b4 100644
--- a/packages/rpc-core/package.json
+++ b/packages/rpc-core/package.json
@@ -1,11 +1,12 @@
 {
   "name": "@polkadot/rpc-core",
-  "version": "3.11.2-4",
+  "version": "4.0.1-2",
+  "type": "module",
   "description": "A JavaScript wrapper for the Polkadot JsonRPC interface",
   "main": "index.js",
   "sideEffects": [
     "./detectPackage.js",
-    "./detectPackage.mjs"
+    "./detectPackage.cjs"
   ],
   "author": "Jaco Greeff <jacogr@gmail.com>",
   "maintainers": [],
@@ -16,13 +17,13 @@
   "homepage": "https://github.com/polkadot-js/api/tree/master/packages/rpc-core#readme",
   "dependencies": {
     "@babel/runtime": "^7.13.8",
-    "@polkadot/metadata": "3.11.2-4",
-    "@polkadot/rpc-provider": "3.11.2-4",
-    "@polkadot/types": "3.11.2-4",
-    "@polkadot/util": "^5.9.2",
-    "@polkadot/x-rxjs": "^5.9.2"
+    "@polkadot/metadata": "4.0.1-2",
+    "@polkadot/rpc-provider": "4.0.1-2",
+    "@polkadot/types": "4.0.1-2",
+    "@polkadot/util": "^6.0.1-4",
+    "@polkadot/x-rxjs": "^6.0.1-4"
   },
   "devDependencies": {
-    "@polkadot/keyring": "^5.9.2"
+    "@polkadot/keyring": "^6.0.1-4"
   }
 }
diff --git a/packages/rpc-core/src/packageInfo.ts b/packages/rpc-core/src/packageInfo.ts
index a86ef3a77a..43013c6cc5 100644
--- a/packages/rpc-core/src/packageInfo.ts
+++ b/packages/rpc-core/src/packageInfo.ts
@@ -1,6 +1,6 @@
-// Copyright 2017-2021 @polkadot/dev authors & contributors
+// Copyright 2017-2021 @polkadot/rpc-core authors & contributors
 // SPDX-License-Identifier: Apache-2.0
 
 // Auto-generated by @polkadot/dev, do not edit
 
-export const packageInfo = { name: '@polkadot/rpc-core', version: '3.11.2-4' };
+export const packageInfo = { name: '@polkadot/rpc-core', version: '4.0.0-1' };
diff --git a/packages/rpc-provider/package.json b/packages/rpc-provider/package.json
index 6e2163e879..0307b05993 100644
--- a/packages/rpc-provider/package.json
+++ b/packages/rpc-provider/package.json
@@ -1,11 +1,12 @@
 {
   "name": "@polkadot/rpc-provider",
-  "version": "3.11.2-4",
+  "version": "4.0.1-2",
+  "type": "module",
   "description": "Transport providers for the API",
   "main": "index.js",
   "sideEffects": [
     "./detectPackage.js",
-    "./detectPackage.mjs"
+    "./detectPackage.cjs"
   ],
   "author": "Jaco Greeff <jacogr@gmail.com>",
   "maintainers": [],
@@ -16,18 +17,18 @@
   "homepage": "https://github.com/polkadot-js/api/tree/master/packages/rpc-provider#readme",
   "dependencies": {
     "@babel/runtime": "^7.13.8",
-    "@polkadot/types": "3.11.2-4",
-    "@polkadot/util": "^5.9.2",
-    "@polkadot/util-crypto": "^5.9.2",
-    "@polkadot/x-fetch": "^5.9.2",
-    "@polkadot/x-global": "^5.9.2",
-    "@polkadot/x-ws": "^5.9.2",
+    "@polkadot/types": "4.0.1-2",
+    "@polkadot/util": "^6.0.1-4",
+    "@polkadot/util-crypto": "^6.0.1-4",
+    "@polkadot/x-fetch": "^6.0.1-4",
+    "@polkadot/x-global": "^6.0.1-4",
+    "@polkadot/x-ws": "^6.0.1-4",
     "bn.js": "^4.11.9",
     "eventemitter3": "^4.0.7"
   },
   "devDependencies": {
-    "@polkadot/keyring": "^5.9.2",
-    "@polkadot/metadata": "3.11.2-4",
+    "@polkadot/keyring": "^6.0.1-4",
+    "@polkadot/metadata": "4.0.1-2",
     "mock-socket": "^9.0.3",
     "nock": "^13.0.9"
   }
diff --git a/packages/rpc-provider/src/packageInfo.ts b/packages/rpc-provider/src/packageInfo.ts
index bf948a4f39..d9fa25ee27 100644
--- a/packages/rpc-provider/src/packageInfo.ts
+++ b/packages/rpc-provider/src/packageInfo.ts
@@ -1,6 +1,6 @@
-// Copyright 2017-2021 @polkadot/dev authors & contributors
+// Copyright 2017-2021 @polkadot/rpc-provider authors & contributors
 // SPDX-License-Identifier: Apache-2.0
 
 // Auto-generated by @polkadot/dev, do not edit
 
-export const packageInfo = { name: '@polkadot/rpc-provider', version: '3.11.2-4' };
+export const packageInfo = { name: '@polkadot/rpc-provider', version: '4.0.0-1' };
diff --git a/packages/typegen/package.json b/packages/typegen/package.json
index 20d79d5d3f..9666009424 100644
--- a/packages/typegen/package.json
+++ b/packages/typegen/package.json
@@ -1,18 +1,19 @@
 {
   "name": "@polkadot/typegen",
-  "version": "3.11.2-4",
+  "version": "4.0.1-2",
+  "type": "module",
   "description": "Type generation scripts",
   "main": "index.js",
   "sideEffects": [
     "./detectPackage.js",
-    "./detectPackage.mjs"
+    "./detectPackage.cjs"
   ],
   "bin": {
-    "polkadot-types-chain-info": "./scripts/polkadot-types-chain-info.js",
-    "polkadot-types-from-chain": "./scripts/polkadot-types-from-chain.js",
-    "polkadot-types-from-defs": "./scripts/polkadot-types-from-defs.js",
-    "polkadot-types-internal-interfaces": "./scripts/polkadot-types-internal-interfaces.js",
-    "polkadot-types-internal-metadata": "./scripts/polkadot-types-internal-metadata.js"
+    "polkadot-types-chain-info": "./scripts/polkadot-types-chain-info.cjs",
+    "polkadot-types-from-chain": "./scripts/polkadot-types-from-chain.cjs",
+    "polkadot-types-from-defs": "./scripts/polkadot-types-from-defs.cjs",
+    "polkadot-types-internal-interfaces": "./scripts/polkadot-types-internal-interfaces.cjs",
+    "polkadot-types-internal-metadata": "./scripts/polkadot-types-internal-metadata.cjs"
   },
   "repository": "github:polkadot-js/api",
   "author": "Jaco Greeff <jacogr@gmail.com>",
@@ -25,11 +26,11 @@
     "@babel/core": "^7.13.8",
     "@babel/register": "^7.13.8",
     "@babel/runtime": "^7.13.8",
-    "@polkadot/api": "3.11.2-4",
-    "@polkadot/metadata": "3.11.2-4",
-    "@polkadot/rpc-provider": "3.11.2-4",
-    "@polkadot/types": "3.11.2-4",
-    "@polkadot/util": "^5.9.2",
+    "@polkadot/api": "4.0.1-2",
+    "@polkadot/metadata": "4.0.1-2",
+    "@polkadot/rpc-provider": "4.0.1-2",
+    "@polkadot/types": "4.0.1-2",
+    "@polkadot/util": "^6.0.1-4",
     "handlebars": "^4.7.7",
     "websocket": "^1.0.33",
     "yargs": "^16.2.0"
diff --git a/packages/typegen/scripts/polkadot-types-chain-info.js b/packages/typegen/scripts/polkadot-types-chain-info.cjs
similarity index 91%
rename from packages/typegen/scripts/polkadot-types-chain-info.js
rename to packages/typegen/scripts/polkadot-types-chain-info.cjs
index 1f9d9353a1..4c7460e96a 100755
--- a/packages/typegen/scripts/polkadot-types-chain-info.js
+++ b/packages/typegen/scripts/polkadot-types-chain-info.cjs
@@ -7,8 +7,10 @@
 let main;
 
 try {
-  main = require('../extractChain').main;
+  main = require('../extractChain.cjs').main;
 } catch (error) {
+  process.env.JEST_WORKER_ID = '123';
+
   require('@babel/register')({
     extensions: ['.js', '.ts'],
     plugins: [
diff --git a/packages/typegen/scripts/polkadot-types-from-chain.js b/packages/typegen/scripts/polkadot-types-from-chain.cjs
similarity index 87%
rename from packages/typegen/scripts/polkadot-types-from-chain.js
rename to packages/typegen/scripts/polkadot-types-from-chain.cjs
index a71efb08da..ee3ac76edc 100755
--- a/packages/typegen/scripts/polkadot-types-from-chain.js
+++ b/packages/typegen/scripts/polkadot-types-from-chain.cjs
@@ -7,8 +7,10 @@
 let main;
 
 try {
-  main = require('../fromChain').main;
+  main = require('../fromChain.cjs').main;
 } catch (error) {
+  process.env.JEST_WORKER_ID = '123';
+
   require('@babel/register')({
     extensions: ['.js', '.ts'],
     plugins: [
diff --git a/packages/typegen/scripts/polkadot-types-from-defs.js b/packages/typegen/scripts/polkadot-types-from-defs.cjs
similarity index 89%
rename from packages/typegen/scripts/polkadot-types-from-defs.js
rename to packages/typegen/scripts/polkadot-types-from-defs.cjs
index 66dcfdc498..af7f9965b2 100755
--- a/packages/typegen/scripts/polkadot-types-from-defs.js
+++ b/packages/typegen/scripts/polkadot-types-from-defs.cjs
@@ -7,8 +7,10 @@
 let main;
 
 try {
-  main = require('../fromDefs').main;
+  main = require('../fromDefs.cjs').main;
 } catch (error) {
+  process.env.JEST_WORKER_ID = '123';
+
   require('@babel/register')({
     extensions: ['.js', '.ts'],
     plugins: [
diff --git a/packages/typegen/scripts/polkadot-types-internal-interfaces.js b/packages/typegen/scripts/polkadot-types-internal-interfaces.cjs
similarity index 87%
rename from packages/typegen/scripts/polkadot-types-internal-interfaces.js
rename to packages/typegen/scripts/polkadot-types-internal-interfaces.cjs
index db0f519c15..0785e14772 100755
--- a/packages/typegen/scripts/polkadot-types-internal-interfaces.js
+++ b/packages/typegen/scripts/polkadot-types-internal-interfaces.cjs
@@ -7,8 +7,10 @@
 let main;
 
 try {
-  main = require('../interfacesTs').main;
+  main = require('../interfacesTs.cjs').main;
 } catch (error) {
+  process.env.JEST_WORKER_ID = '123';
+
   require('@babel/register')({
     extensions: ['.js', '.ts'],
     plugins: [
diff --git a/packages/typegen/scripts/polkadot-types-internal-metadata.js b/packages/typegen/scripts/polkadot-types-internal-metadata.cjs
similarity index 87%
rename from packages/typegen/scripts/polkadot-types-internal-metadata.js
rename to packages/typegen/scripts/polkadot-types-internal-metadata.cjs
index 13b0772445..8991312f07 100755
--- a/packages/typegen/scripts/polkadot-types-internal-metadata.js
+++ b/packages/typegen/scripts/polkadot-types-internal-metadata.cjs
@@ -7,8 +7,10 @@
 let main;
 
 try {
-  main = require('../metadataMd').main;
+  main = require('../metadataMd.cjs').main;
 } catch (error) {
+  process.env.JEST_WORKER_ID = '123';
+
   require('@babel/register')({
     extensions: ['.js', '.ts'],
     plugins: [
diff --git a/packages/typegen/src/packageInfo.ts b/packages/typegen/src/packageInfo.ts
index a8f48bc3dd..80cc2d9b97 100644
--- a/packages/typegen/src/packageInfo.ts
+++ b/packages/typegen/src/packageInfo.ts
@@ -1,6 +1,6 @@
-// Copyright 2017-2021 @polkadot/dev authors & contributors
+// Copyright 2017-2021 @polkadot/typegen authors & contributors
 // SPDX-License-Identifier: Apache-2.0
 
 // Auto-generated by @polkadot/dev, do not edit
 
-export const packageInfo = { name: '@polkadot/typegen', version: '3.11.2-4' };
+export const packageInfo = { name: '@polkadot/typegen', version: '4.0.0-1' };
diff --git a/packages/types-known/package.json b/packages/types-known/package.json
index 7128f92fe5..f28ae7f527 100644
--- a/packages/types-known/package.json
+++ b/packages/types-known/package.json
@@ -1,11 +1,12 @@
 {
   "name": "@polkadot/types-known",
-  "version": "3.11.2-4",
+  "version": "4.0.1-2",
+  "type": "module",
   "description": "A JavaScript wrapper for the Polkadot JsonRPC interface",
   "main": "index.js",
   "sideEffects": [
     "./detectPackage.js",
-    "./detectPackage.mjs"
+    "./detectPackage.cjs"
   ],
   "author": "Jaco Greeff <jacogr@gmail.com>",
   "maintainers": [],
@@ -16,9 +17,9 @@
   "homepage": "https://github.com/polkadot-js/api/tree/master/packages/types-known#readme",
   "dependencies": {
     "@babel/runtime": "^7.13.8",
-    "@polkadot/networks": "^5.9.2",
-    "@polkadot/types": "3.11.2-4",
-    "@polkadot/util": "^5.9.2",
+    "@polkadot/networks": "^6.0.1-4",
+    "@polkadot/types": "4.0.1-2",
+    "@polkadot/util": "^6.0.1-4",
     "bn.js": "^4.11.9"
   },
   "devDependencies": {
diff --git a/packages/types-known/src/packageInfo.ts b/packages/types-known/src/packageInfo.ts
index 4d04bf3630..8109daac37 100644
--- a/packages/types-known/src/packageInfo.ts
+++ b/packages/types-known/src/packageInfo.ts
@@ -1,6 +1,6 @@
-// Copyright 2017-2021 @polkadot/dev authors & contributors
+// Copyright 2017-2021 @polkadot/types-known authors & contributors
 // SPDX-License-Identifier: Apache-2.0
 
 // Auto-generated by @polkadot/dev, do not edit
 
-export const packageInfo = { name: '@polkadot/types-known', version: '3.11.2-4' };
+export const packageInfo = { name: '@polkadot/types-known', version: '4.0.0-1' };
diff --git a/packages/types/package.json b/packages/types/package.json
index 878de9635a..0335e93255 100644
--- a/packages/types/package.json
+++ b/packages/types/package.json
@@ -1,11 +1,12 @@
 {
   "name": "@polkadot/types",
-  "version": "3.11.2-4",
+  "version": "4.0.1-2",
+  "type": "module",
   "description": "Implementation of the Parity codec",
   "main": "index.js",
   "sideEffects": [
     "./detectPackage.js",
-    "./detectPackage.mjs"
+    "./detectPackage.cjs"
   ],
   "author": "Jaco Greeff <jacogr@gmail.com>",
   "maintainers": [],
@@ -16,14 +17,14 @@
   "homepage": "https://github.com/polkadot-js/api/tree/master/packages/types#readme",
   "dependencies": {
     "@babel/runtime": "^7.13.8",
-    "@polkadot/metadata": "3.11.2-4",
-    "@polkadot/util": "^5.9.2",
-    "@polkadot/util-crypto": "^5.9.2",
-    "@polkadot/x-rxjs": "^5.9.2",
+    "@polkadot/metadata": "4.0.1-2",
+    "@polkadot/util": "^6.0.1-4",
+    "@polkadot/util-crypto": "^6.0.1-4",
+    "@polkadot/x-rxjs": "^6.0.1-4",
     "@types/bn.js": "^4.11.6",
     "bn.js": "^4.11.9"
   },
   "devDependencies": {
-    "@polkadot/keyring": "^5.9.2"
+    "@polkadot/keyring": "^6.0.1-4"
   }
 }
diff --git a/packages/types/src/packageInfo.ts b/packages/types/src/packageInfo.ts
index af6fe9222d..6440473784 100644
--- a/packages/types/src/packageInfo.ts
+++ b/packages/types/src/packageInfo.ts
@@ -1,6 +1,6 @@
-// Copyright 2017-2021 @polkadot/dev authors & contributors
+// Copyright 2017-2021 @polkadot/types authors & contributors
 // SPDX-License-Identifier: Apache-2.0
 
 // Auto-generated by @polkadot/dev, do not edit
 
-export const packageInfo = { name: '@polkadot/types', version: '3.11.2-4' };
+export const packageInfo = { name: '@polkadot/types', version: '4.0.0-1' };
diff --git a/yarn.lock b/yarn.lock
index 2fa87be1ca..0d37034e9a 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1295,12 +1295,12 @@ __metadata:
   languageName: node
   linkType: hard
 
-"@babel/runtime@npm:^7.13.7, @babel/runtime@npm:^7.13.8, @babel/runtime@npm:^7.8.4":
-  version: 7.13.8
-  resolution: "@babel/runtime@npm:7.13.8"
+"@babel/runtime@npm:^7.13.8, @babel/runtime@npm:^7.13.9, @babel/runtime@npm:^7.8.4":
+  version: 7.13.9
+  resolution: "@babel/runtime@npm:7.13.9"
   dependencies:
     regenerator-runtime: ^0.13.4
-  checksum: d8db125d3629c4000322e8264d7510640ac671136f416d1fcd4b74d26d7e703bf671820fab81a29a5ee0bd11e981de518666619398ec29b1ab5e155ab8131812
+  checksum: e6f79d20e10c2921520c499f3cf295a9ee5c137e73f77f77eedde9f9073bc3541c1fc7fa6c97b0613f4140303ac00d08506e9f090068d219c58781d2b62c662d
   languageName: node
   linkType: hard
 
@@ -1778,54 +1778,54 @@ __metadata:
   resolution: "@polkadot/api-contract@workspace:packages/api-contract"
   dependencies:
     "@babel/runtime": ^7.13.8
-    "@polkadot/api": 3.11.2-4
-    "@polkadot/types": 3.11.2-4
-    "@polkadot/util": ^5.9.2
-    "@polkadot/x-rxjs": ^5.9.2
+    "@polkadot/api": 4.0.1-2
+    "@polkadot/types": 4.0.1-2
+    "@polkadot/util": ^6.0.1-4
+    "@polkadot/x-rxjs": ^6.0.1-4
     bn.js: ^4.11.9
   languageName: unknown
   linkType: soft
 
-"@polkadot/api-derive@3.11.2-4, @polkadot/api-derive@workspace:packages/api-derive":
+"@polkadot/api-derive@4.0.1-2, @polkadot/api-derive@workspace:packages/api-derive":
   version: 0.0.0-use.local
   resolution: "@polkadot/api-derive@workspace:packages/api-derive"
   dependencies:
     "@babel/runtime": ^7.13.8
-    "@polkadot/api": 3.11.2-4
-    "@polkadot/keyring": ^5.9.2
-    "@polkadot/rpc-core": 3.11.2-4
-    "@polkadot/rpc-provider": 3.11.2-4
-    "@polkadot/types": 3.11.2-4
-    "@polkadot/util": ^5.9.2
-    "@polkadot/util-crypto": ^5.9.2
-    "@polkadot/x-rxjs": ^5.9.2
+    "@polkadot/api": 4.0.1-2
+    "@polkadot/keyring": ^6.0.1-4
+    "@polkadot/rpc-core": 4.0.1-2
+    "@polkadot/rpc-provider": 4.0.1-2
+    "@polkadot/types": 4.0.1-2
+    "@polkadot/util": ^6.0.1-4
+    "@polkadot/util-crypto": ^6.0.1-4
+    "@polkadot/x-rxjs": ^6.0.1-4
     bn.js: ^4.11.9
   languageName: unknown
   linkType: soft
 
-"@polkadot/api@3.11.2-4, @polkadot/api@workspace:packages/api":
+"@polkadot/api@4.0.1-2, @polkadot/api@workspace:packages/api":
   version: 0.0.0-use.local
   resolution: "@polkadot/api@workspace:packages/api"
   dependencies:
     "@babel/runtime": ^7.13.8
-    "@polkadot/api-derive": 3.11.2-4
-    "@polkadot/keyring": ^5.9.2
-    "@polkadot/metadata": 3.11.2-4
-    "@polkadot/rpc-core": 3.11.2-4
-    "@polkadot/rpc-provider": 3.11.2-4
-    "@polkadot/types": 3.11.2-4
-    "@polkadot/types-known": 3.11.2-4
-    "@polkadot/util": ^5.9.2
-    "@polkadot/util-crypto": ^5.9.2
-    "@polkadot/x-rxjs": ^5.9.2
+    "@polkadot/api-derive": 4.0.1-2
+    "@polkadot/keyring": ^6.0.1-4
+    "@polkadot/metadata": 4.0.1-2
+    "@polkadot/rpc-core": 4.0.1-2
+    "@polkadot/rpc-provider": 4.0.1-2
+    "@polkadot/types": 4.0.1-2
+    "@polkadot/types-known": 4.0.1-2
+    "@polkadot/util": ^6.0.1-4
+    "@polkadot/util-crypto": ^6.0.1-4
+    "@polkadot/x-rxjs": ^6.0.1-4
     bn.js: ^4.11.9
     eventemitter3: ^4.0.7
   languageName: unknown
   linkType: soft
 
-"@polkadot/dev@npm:^0.61.31":
-  version: 0.61.31
-  resolution: "@polkadot/dev@npm:0.61.31"
+"@polkadot/dev@npm:^0.62.2":
+  version: 0.62.2
+  resolution: "@polkadot/dev@npm:0.62.2"
   dependencies:
     "@babel/cli": ^7.13.0
     "@babel/core": ^7.13.8
@@ -1909,74 +1909,74 @@ __metadata:
     polkadot-exec-tsc: scripts/polkadot-exec-tsc.cjs
     polkadot-exec-typedoc: scripts/polkadot-exec-typedoc.cjs
     polkadot-exec-webpack: scripts/polkadot-exec-webpack.cjs
-  checksum: 087b0f00c94d11f03e10731101a9c81c4034ca3d49d838fb602b95db611bdd9968006610c3b1abdf8977162ccce6e5edceff64636bfd69fae45a2c649f6c2257
+  checksum: 48e949933efd2c9e528ac4d9f3013d6246826e772841010b822c3626c5f69e9e22692820664c50c21b346fc085895d790013d63f662aa4daba21406d8b7740b2
   languageName: node
   linkType: hard
 
-"@polkadot/keyring@npm:^5.9.2":
-  version: 5.9.2
-  resolution: "@polkadot/keyring@npm:5.9.2"
+"@polkadot/keyring@npm:^6.0.1-4":
+  version: 6.0.1-4
+  resolution: "@polkadot/keyring@npm:6.0.1-4"
   dependencies:
-    "@babel/runtime": ^7.13.8
-    "@polkadot/util": 5.9.2
-    "@polkadot/util-crypto": 5.9.2
+    "@babel/runtime": ^7.13.9
+    "@polkadot/util": 6.0.1-4
+    "@polkadot/util-crypto": 6.0.1-4
   peerDependencies:
-    "@polkadot/util": 5.9.2
-    "@polkadot/util-crypto": 5.9.2
-  checksum: 2b94ad27b5ad5aa520d9061b9282ba1c4d2f0418a4037e3de971941b667a8a3d0968b85e122b8c445d3cae7a37ae0825dc9ccea078a8205182dacf21a479cc87
+    "@polkadot/util": 6.0.1-4
+    "@polkadot/util-crypto": 6.0.1-4
+  checksum: 28765963d4fdc052e71525a9348709bc0eb6bb3364e0757c6c8b48146440d5f8da0b4bacd44b34d45845177ca38c980271e09cd0f965d9baff89bc176a44c9e7
   languageName: node
   linkType: hard
 
-"@polkadot/metadata@3.11.2-4, @polkadot/metadata@workspace:packages/metadata":
+"@polkadot/metadata@4.0.1-2, @polkadot/metadata@workspace:packages/metadata":
   version: 0.0.0-use.local
   resolution: "@polkadot/metadata@workspace:packages/metadata"
   dependencies:
     "@babel/runtime": ^7.13.8
-    "@polkadot/keyring": ^5.9.2
-    "@polkadot/types": 3.11.2-4
-    "@polkadot/types-known": 3.11.2-4
-    "@polkadot/util": ^5.9.2
-    "@polkadot/util-crypto": ^5.9.2
+    "@polkadot/keyring": ^6.0.1-4
+    "@polkadot/types": 4.0.1-2
+    "@polkadot/types-known": 4.0.1-2
+    "@polkadot/util": ^6.0.1-4
+    "@polkadot/util-crypto": ^6.0.1-4
     bn.js: ^4.11.9
   languageName: unknown
   linkType: soft
 
-"@polkadot/networks@npm:5.9.2, @polkadot/networks@npm:^5.9.2":
-  version: 5.9.2
-  resolution: "@polkadot/networks@npm:5.9.2"
+"@polkadot/networks@npm:6.0.1-4, @polkadot/networks@npm:^6.0.1-4":
+  version: 6.0.1-4
+  resolution: "@polkadot/networks@npm:6.0.1-4"
   dependencies:
-    "@babel/runtime": ^7.13.8
-  checksum: 42a2022af8217a3bf77003d98e0ae3ff351005250bbeab504a612c7af719314eeccde93f0588aed64b1f8949cf924d51894d27836e9cc2c4a273cb8f1761db4a
+    "@babel/runtime": ^7.13.9
+  checksum: f1e586a12aea5ea39d6ce3bc85282df637b9948cce96d5c609d29e8c25755282bd64a6c482f9828e0d159299024c433eeb2b41e328abdd13397e2098bc636bf6
   languageName: node
   linkType: hard
 
-"@polkadot/rpc-core@3.11.2-4, @polkadot/rpc-core@workspace:packages/rpc-core":
+"@polkadot/rpc-core@4.0.1-2, @polkadot/rpc-core@workspace:packages/rpc-core":
   version: 0.0.0-use.local
   resolution: "@polkadot/rpc-core@workspace:packages/rpc-core"
   dependencies:
     "@babel/runtime": ^7.13.8
-    "@polkadot/keyring": ^5.9.2
-    "@polkadot/metadata": 3.11.2-4
-    "@polkadot/rpc-provider": 3.11.2-4
-    "@polkadot/types": 3.11.2-4
-    "@polkadot/util": ^5.9.2
-    "@polkadot/x-rxjs": ^5.9.2
+    "@polkadot/keyring": ^6.0.1-4
+    "@polkadot/metadata": 4.0.1-2
+    "@polkadot/rpc-provider": 4.0.1-2
+    "@polkadot/types": 4.0.1-2
+    "@polkadot/util": ^6.0.1-4
+    "@polkadot/x-rxjs": ^6.0.1-4
   languageName: unknown
   linkType: soft
 
-"@polkadot/rpc-provider@3.11.2-4, @polkadot/rpc-provider@workspace:packages/rpc-provider":
+"@polkadot/rpc-provider@4.0.1-2, @polkadot/rpc-provider@workspace:packages/rpc-provider":
   version: 0.0.0-use.local
   resolution: "@polkadot/rpc-provider@workspace:packages/rpc-provider"
   dependencies:
     "@babel/runtime": ^7.13.8
-    "@polkadot/keyring": ^5.9.2
-    "@polkadot/metadata": 3.11.2-4
-    "@polkadot/types": 3.11.2-4
-    "@polkadot/util": ^5.9.2
-    "@polkadot/util-crypto": ^5.9.2
-    "@polkadot/x-fetch": ^5.9.2
-    "@polkadot/x-global": ^5.9.2
-    "@polkadot/x-ws": ^5.9.2
+    "@polkadot/keyring": ^6.0.1-4
+    "@polkadot/metadata": 4.0.1-2
+    "@polkadot/types": 4.0.1-2
+    "@polkadot/util": ^6.0.1-4
+    "@polkadot/util-crypto": ^6.0.1-4
+    "@polkadot/x-fetch": ^6.0.1-4
+    "@polkadot/x-global": ^6.0.1-4
+    "@polkadot/x-ws": ^6.0.1-4
     bn.js: ^4.11.9
     eventemitter3: ^4.0.7
     mock-socket: ^9.0.3
@@ -2000,62 +2000,62 @@ __metadata:
     "@babel/core": ^7.13.8
     "@babel/register": ^7.13.8
     "@babel/runtime": ^7.13.8
-    "@polkadot/api": 3.11.2-4
-    "@polkadot/metadata": 3.11.2-4
-    "@polkadot/rpc-provider": 3.11.2-4
-    "@polkadot/types": 3.11.2-4
-    "@polkadot/util": ^5.9.2
+    "@polkadot/api": 4.0.1-2
+    "@polkadot/metadata": 4.0.1-2
+    "@polkadot/rpc-provider": 4.0.1-2
+    "@polkadot/types": 4.0.1-2
+    "@polkadot/util": ^6.0.1-4
     "@types/websocket": ^1.0.1
     "@types/yargs": ^16.0.0
     handlebars: ^4.7.7
     websocket: ^1.0.33
     yargs: ^16.2.0
   bin:
-    polkadot-types-chain-info: ./scripts/polkadot-types-chain-info.js
-    polkadot-types-from-chain: ./scripts/polkadot-types-from-chain.js
-    polkadot-types-from-defs: ./scripts/polkadot-types-from-defs.js
-    polkadot-types-internal-interfaces: ./scripts/polkadot-types-internal-interfaces.js
-    polkadot-types-internal-metadata: ./scripts/polkadot-types-internal-metadata.js
+    polkadot-types-chain-info: ./scripts/polkadot-types-chain-info.cjs
+    polkadot-types-from-chain: ./scripts/polkadot-types-from-chain.cjs
+    polkadot-types-from-defs: ./scripts/polkadot-types-from-defs.cjs
+    polkadot-types-internal-interfaces: ./scripts/polkadot-types-internal-interfaces.cjs
+    polkadot-types-internal-metadata: ./scripts/polkadot-types-internal-metadata.cjs
   languageName: unknown
   linkType: soft
 
-"@polkadot/types-known@3.11.2-4, @polkadot/types-known@workspace:packages/types-known":
+"@polkadot/types-known@4.0.1-2, @polkadot/types-known@workspace:packages/types-known":
   version: 0.0.0-use.local
   resolution: "@polkadot/types-known@workspace:packages/types-known"
   dependencies:
     "@babel/runtime": ^7.13.8
-    "@polkadot/networks": ^5.9.2
-    "@polkadot/types": 3.11.2-4
-    "@polkadot/util": ^5.9.2
+    "@polkadot/networks": ^6.0.1-4
+    "@polkadot/types": 4.0.1-2
+    "@polkadot/util": ^6.0.1-4
     "@types/bn.js": ^4.11.6
     bn.js: ^4.11.9
   languageName: unknown
   linkType: soft
 
-"@polkadot/types@3.11.2-4, @polkadot/types@workspace:packages/types":
+"@polkadot/types@4.0.1-2, @polkadot/types@workspace:packages/types":
   version: 0.0.0-use.local
   resolution: "@polkadot/types@workspace:packages/types"
   dependencies:
     "@babel/runtime": ^7.13.8
-    "@polkadot/keyring": ^5.9.2
-    "@polkadot/metadata": 3.11.2-4
-    "@polkadot/util": ^5.9.2
-    "@polkadot/util-crypto": ^5.9.2
-    "@polkadot/x-rxjs": ^5.9.2
+    "@polkadot/keyring": ^6.0.1-4
+    "@polkadot/metadata": 4.0.1-2
+    "@polkadot/util": ^6.0.1-4
+    "@polkadot/util-crypto": ^6.0.1-4
+    "@polkadot/x-rxjs": ^6.0.1-4
     "@types/bn.js": ^4.11.6
     bn.js: ^4.11.9
   languageName: unknown
   linkType: soft
 
-"@polkadot/util-crypto@npm:5.9.2, @polkadot/util-crypto@npm:^5.9.2":
-  version: 5.9.2
-  resolution: "@polkadot/util-crypto@npm:5.9.2"
+"@polkadot/util-crypto@npm:6.0.1-4, @polkadot/util-crypto@npm:^6.0.1-4":
+  version: 6.0.1-4
+  resolution: "@polkadot/util-crypto@npm:6.0.1-4"
   dependencies:
-    "@babel/runtime": ^7.13.8
-    "@polkadot/networks": 5.9.2
-    "@polkadot/util": 5.9.2
-    "@polkadot/wasm-crypto": ^3.2.4
-    "@polkadot/x-randomvalues": 5.9.2
+    "@babel/runtime": ^7.13.9
+    "@polkadot/networks": 6.0.1-4
+    "@polkadot/util": 6.0.1-4
+    "@polkadot/wasm-crypto": ^4.0.1-3
+    "@polkadot/x-randomvalues": 6.0.1-4
     base-x: ^3.0.8
     base64-js: ^1.5.1
     blakejs: ^1.1.0
@@ -2068,130 +2068,130 @@ __metadata:
     tweetnacl: ^1.0.3
     xxhashjs: ^0.2.2
   peerDependencies:
-    "@polkadot/util": 5.9.2
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