diff --git a/CHANGELOG.md b/CHANGELOG.md
index 64c84d4fdc..7615ce4179 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,10 +1,14 @@
-# 1.4.0-beta.x
+# 1.4.1
 
-- Added `stringToHex` and `hexToString` conversion utilities
+- **Breaking change** To set the `ss58Format`, you should now use `setSS58Format` as opposed to the old `setAddressPrefix`
+- Renamed `keyring.setAddressPrefix` to `keyring.setSS58Format`
+- Deprecated `addressPrefix` on the keyring options, added the `ss58Format` as a replacement (aligning with chain properties - the old version is still accepted)
+- Added `stringToHex` and `hexToString` conversion utilities to `@polkadot/util`
+- Swap to [Babel 7.6.0](https://babeljs.io/) for all compilation, for latest improvements in code generation
 
 # 1.3.1
 
-- Remove the `ExtError` class, always prefer the standard JS `Error` object for errors. This would bre a breaking change for any appliactions using `ExtError`
+- Remove the `ExtError` class, always prefer the standard JS `Error` object for errors. This would bre a breaking change for any applications using `ExtError`
 
 # 1.2.1
 
diff --git a/lerna.json b/lerna.json
index e226d2abe4..a0d0ebecce 100644
--- a/lerna.json
+++ b/lerna.json
@@ -9,5 +9,5 @@
   "packages": [
     "packages/*"
   ],
-  "version": "1.4.0-beta.0"
+  "version": "1.4.0"
 }
diff --git a/packages/chainspec/package.json b/packages/chainspec/package.json
index aa23cbbf6e..ec4aec20a3 100644
--- a/packages/chainspec/package.json
+++ b/packages/chainspec/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@polkadot/chainspec",
-  "version": "1.4.0-beta.0",
+  "version": "1.4.0",
   "description": "Contains chain specifications for known chains",
   "main": "index.js",
   "keywords": [
@@ -26,6 +26,6 @@
   "homepage": "https://github.com/polkadot-js/common/tree/master/packages/chainspec#readme",
   "dependencies": {
     "@babel/runtime": "^7.6.0",
-    "@polkadot/util": "^1.4.0-beta.0"
+    "@polkadot/util": "^1.4.0"
   }
 }
diff --git a/packages/db/package.json b/packages/db/package.json
index 1deb686aed..d30890e246 100644
--- a/packages/db/package.json
+++ b/packages/db/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@polkadot/db",
-  "version": "1.4.0-beta.0",
+  "version": "1.4.0",
   "description": "Implementation of a basic sync in-memory and on-disk databases with overlays",
   "main": "index.js",
   "keywords": [
@@ -26,8 +26,8 @@
   "homepage": "https://github.com/polkadot-js/common/tree/master/packages/db#readme",
   "dependencies": {
     "@babel/runtime": "^7.6.0",
-    "@polkadot/trie-hash": "^1.4.0-beta.0",
-    "@polkadot/util": "^1.4.0-beta.0",
+    "@polkadot/trie-hash": "^1.4.0",
+    "@polkadot/util": "^1.4.0",
     "lru_map": "^0.3.3"
   }
 }
diff --git a/packages/keyring/package.json b/packages/keyring/package.json
index 7ed3675082..379e4a252b 100644
--- a/packages/keyring/package.json
+++ b/packages/keyring/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@polkadot/keyring",
-  "version": "1.4.0-beta.0",
+  "version": "1.4.0",
   "description": "Keyring management",
   "main": "index.js",
   "publishConfig": {
@@ -28,7 +28,7 @@
   "homepage": "https://github.com/polkadot-js/common/tree/master/packages/keyring#readme",
   "dependencies": {
     "@babel/runtime": "^7.6.0",
-    "@polkadot/util": "^1.4.0-beta.0",
-    "@polkadot/util-crypto": "^1.4.0-beta.0"
+    "@polkadot/util": "^1.4.0",
+    "@polkadot/util-crypto": "^1.4.0"
   }
 }
diff --git a/packages/keyring/src/index.spec.ts b/packages/keyring/src/index.spec.ts
index 7225a04dd0..af96a1aea6 100644
--- a/packages/keyring/src/index.spec.ts
+++ b/packages/keyring/src/index.spec.ts
@@ -3,7 +3,7 @@
 // of the Apache-2.0 license. See the LICENSE file for details.
 
 import { hexToU8a, stringToU8a } from '@polkadot/util';
-import { cryptoWaitReady, setAddressPrefix } from '@polkadot/util-crypto';
+import { cryptoWaitReady, setSS58Format } from '@polkadot/util-crypto';
 
 import Keyring from '.';
 
@@ -25,6 +25,10 @@ describe('keypair', (): void => {
       keypair.addFromSeed(seedOne, {});
     });
 
+    afterEach((): void => {
+      setSS58Format(42);
+    });
+
     it('adds the pair', (): void => {
       expect(
         keypair.addFromSeed(seedTwo, {}).publicKey
@@ -40,7 +44,7 @@ describe('keypair', (): void => {
     });
 
     it('adds from a mnemonic', (): void => {
-      setAddressPrefix(68);
+      setSS58Format(68);
 
       expect(
         keypair.addFromMnemonic('moral movie very draw assault whisper awful rebuild speed purity repeat card', {}).address
@@ -93,6 +97,10 @@ describe('keypair', (): void => {
       keypair.addFromSeed(seedOne, {});
     });
 
+    afterEach((): void => {
+      setSS58Format(42);
+    });
+
     it('creates with dev phrase when only path specified', (): void => {
       expect(
         keypair.createFromUri('//Alice').address
@@ -106,7 +114,7 @@ describe('keypair', (): void => {
     });
 
     it('adds from a mnemonic', (): void => {
-      setAddressPrefix(68);
+      setSS58Format(68);
 
       expect(
         keypair.addFromMnemonic('moral movie very draw assault whisper awful rebuild speed purity repeat card', {}).address
diff --git a/packages/keyring/src/index.ts b/packages/keyring/src/index.ts
index a57b663055..cbbc8328b7 100644
--- a/packages/keyring/src/index.ts
+++ b/packages/keyring/src/index.ts
@@ -3,7 +3,7 @@
 // of the Apache-2.0 license. See the LICENSE file for details.
 
 import { assertSingletonPackage } from '@polkadot/util';
-import { decodeAddress, encodeAddress, setAddressPrefix } from '@polkadot/util-crypto';
+import { decodeAddress, encodeAddress, setSS58Format } from '@polkadot/util-crypto';
 
 import Keyring from './keyring';
 
@@ -15,5 +15,5 @@ export {
   Keyring,
   decodeAddress,
   encodeAddress,
-  setAddressPrefix
+  setSS58Format
 };
diff --git a/packages/keyring/src/keyring.ts b/packages/keyring/src/keyring.ts
index 1f99ebfadd..fe3d501991 100644
--- a/packages/keyring/src/keyring.ts
+++ b/packages/keyring/src/keyring.ts
@@ -6,7 +6,7 @@ import { KeypairType } from '@polkadot/util-crypto/types';
 import { KeyringInstance, KeyringPair, KeyringPair$Json, KeyringPair$Meta, KeyringOptions } from './types';
 
 import { assert, hexToU8a, isNumber, isHex, stringToU8a } from '@polkadot/util';
-import { decodeAddress, encodeAddress, keyExtractSuri, keyFromPath, naclKeypairFromSeed as naclFromSeed, schnorrkelKeypairFromSeed as schnorrkelFromSeed, mnemonicToMiniSecret, setAddressPrefix } from '@polkadot/util-crypto';
+import { decodeAddress, encodeAddress, keyExtractSuri, keyFromPath, naclKeypairFromSeed as naclFromSeed, schnorrkelKeypairFromSeed as schnorrkelFromSeed, mnemonicToMiniSecret, setSS58Format } from '@polkadot/util-crypto';
 
 import { DEV_PHRASE } from './defaults';
 import createPair from './pair';
@@ -37,17 +37,20 @@ export default class Keyring implements KeyringInstance {
 
   public encodeAddress = encodeAddress;
 
-  public setAddressPrefix = setAddressPrefix;
+  public setSS58Format = setSS58Format;
 
   public constructor (options: KeyringOptions = {}) {
     options.type = options.type || 'ed25519';
+    options.ss58Format = options.ss58Format || options.addressPrefix;
 
     assert(options && ['ed25519', 'sr25519'].includes(options.type || 'undefined'), `Expected a keyring type of either 'ed25519' or 'sr25519', found '${options.type}`);
 
     this._pairs = new Pairs();
     this._type = options.type;
 
-    setAddressPrefix(isNumber(options.addressPrefix) ? options.addressPrefix : 42);
+    if (isNumber(options.ss58Format)) {
+      setSS58Format(options.ss58Format);
+    }
   }
 
   /**
diff --git a/packages/keyring/src/pair/index.spec.ts b/packages/keyring/src/pair/index.spec.ts
index 6706517e24..0b48219e16 100644
--- a/packages/keyring/src/pair/index.spec.ts
+++ b/packages/keyring/src/pair/index.spec.ts
@@ -2,7 +2,7 @@
 // This software may be modified and distributed under the terms
 // of the Apache-2.0 license. See the LICENSE file for details.
 
-import { setAddressPrefix } from '@polkadot/util-crypto';
+import { setSS58Format } from '@polkadot/util-crypto';
 
 import testingPairs from '../testingPairs';
 import createPair from '.';
@@ -61,7 +61,7 @@ describe('pair', (): void => {
       '5GoKvZWG5ZPYL1WUovuHW3zJBWBP5eT8CbqjdRY4Q6iMaQua'
     );
 
-    setAddressPrefix(68);
+    setSS58Format(68);
 
     expect(keyring.alice.address).toEqual(
       '7sGUeMak588SPY2YMmmuKUuLz7u2WQpf74F9dCFtSLB2td9d'
diff --git a/packages/keyring/src/types.ts b/packages/keyring/src/types.ts
index ba193de932..28a31791a3 100644
--- a/packages/keyring/src/types.ts
+++ b/packages/keyring/src/types.ts
@@ -7,7 +7,9 @@ import { Prefix } from '@polkadot/util-crypto/address/types';
 import { KeypairType } from '@polkadot/util-crypto/types';
 
 export interface KeyringOptions {
+  // @deprecated
   addressPrefix?: Prefix;
+  ss58Format?: Prefix;
   type?: KeypairType;
 }
 
@@ -61,7 +63,7 @@ export interface KeyringInstance {
 
   decodeAddress (encoded: string | Uint8Array, ignoreChecksum?: boolean): Uint8Array;
   encodeAddress (key: Uint8Array | string): string;
-  setAddressPrefix (prefix: Prefix): void;
+  setSS58Format (prefix: Prefix): void;
 
   addPair (pair: KeyringPair): KeyringPair;
   addFromAddress (address: string | Uint8Array, meta?: KeyringPair$Meta, encoded?: Uint8Array | null, type?: KeypairType, ignoreChecksum?: boolean): KeyringPair;
diff --git a/packages/trie-codec/package.json b/packages/trie-codec/package.json
index 8878f584ac..2dc7827125 100644
--- a/packages/trie-codec/package.json
+++ b/packages/trie-codec/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@polkadot/trie-codec",
-  "version": "1.4.0-beta.0",
+  "version": "1.4.0",
   "description": "This is an implementation of the codec for Substrate Trie",
   "main": "index.js",
   "keywords": [
@@ -26,6 +26,6 @@
   "homepage": "https://github.com/polkadot-js/common/tree/master/packages/trie-codec#readme",
   "dependencies": {
     "@babel/runtime": "^7.6.0",
-    "@polkadot/util": "^1.4.0-beta.0"
+    "@polkadot/util": "^1.4.0"
   }
 }
diff --git a/packages/trie-db/package.json b/packages/trie-db/package.json
index b861ae072a..0b985415ec 100644
--- a/packages/trie-db/package.json
+++ b/packages/trie-db/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@polkadot/trie-db",
-  "version": "1.4.0-beta.0",
+  "version": "1.4.0",
   "description": "This is an implementation of the modified merkle patricia tree as specified in Ethereum's yellow paper, adapted for Polkadot",
   "main": "index.js",
   "keywords": [
@@ -26,15 +26,15 @@
   "homepage": "https://github.com/polkadot-js/common/tree/master/packages/trie-db#readme",
   "dependencies": {
     "@babel/runtime": "^7.6.0",
-    "@polkadot/db": "^1.4.0-beta.0",
-    "@polkadot/trie-codec": "^1.4.0-beta.0",
-    "@polkadot/trie-hash": "^1.4.0-beta.0",
-    "@polkadot/util": "^1.4.0-beta.0",
-    "@polkadot/util-crypto": "^1.4.0-beta.0"
+    "@polkadot/db": "^1.4.0",
+    "@polkadot/trie-codec": "^1.4.0",
+    "@polkadot/trie-hash": "^1.4.0",
+    "@polkadot/util": "^1.4.0",
+    "@polkadot/util-crypto": "^1.4.0"
   },
   "devDependencies": {
-    "@polkadot/chainspec": "^1.4.0-beta.0",
-    "@polkadot/util-rlp": "^1.4.0-beta.0",
+    "@polkadot/chainspec": "^1.4.0",
+    "@polkadot/util-rlp": "^1.4.0",
     "ethereumjs-testing": "1.0.4"
   }
 }
diff --git a/packages/trie-hash/package.json b/packages/trie-hash/package.json
index 02282d2f93..49999f65a9 100644
--- a/packages/trie-hash/package.json
+++ b/packages/trie-hash/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@polkadot/trie-hash",
-  "version": "1.4.0-beta.0",
+  "version": "1.4.0",
   "description": "Generates trie roots from key-value pairs",
   "main": "index.js",
   "keywords": [
@@ -26,9 +26,9 @@
   "homepage": "https://github.com/polkadot-js/common/tree/master/packages/trie-hash#readme",
   "dependencies": {
     "@babel/runtime": "^7.6.0",
-    "@polkadot/util": "^1.4.0-beta.0"
+    "@polkadot/util": "^1.4.0"
   },
   "devDependencies": {
-    "@polkadot/chainspec": "^1.4.0-beta.0"
+    "@polkadot/chainspec": "^1.4.0"
   }
 }
diff --git a/packages/util-crypto/package.json b/packages/util-crypto/package.json
index 502f044ee6..0030e19e9c 100644
--- a/packages/util-crypto/package.json
+++ b/packages/util-crypto/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@polkadot/util-crypto",
-  "version": "1.4.0-beta.0",
+  "version": "1.4.0",
   "description": "A collection of useful crypto utilities for @polkadot",
   "main": "index.js",
   "keywords": [
@@ -26,7 +26,7 @@
   "homepage": "https://github.com/polkadot-js/common/tree/master/packages/util-crypto#readme",
   "dependencies": {
     "@babel/runtime": "^7.6.0",
-    "@polkadot/util": "^1.4.0-beta.0",
+    "@polkadot/util": "^1.4.0",
     "@polkadot/wasm-crypto": "^0.14.1",
     "@types/bip39": "^2.4.2",
     "@types/bs58": "^4.0.0",
diff --git a/packages/util-crypto/src/address/encode.spec.ts b/packages/util-crypto/src/address/encode.spec.ts
index cf4480dc2a..1cc11d2494 100644
--- a/packages/util-crypto/src/address/encode.spec.ts
+++ b/packages/util-crypto/src/address/encode.spec.ts
@@ -14,6 +14,12 @@ describe('encode', (): void => {
     ).toEqual('5GoKvZWG5ZPYL1WUovuHW3zJBWBP5eT8CbqjdRY4Q6iMaQua');
   });
 
+  it('can re-encode an address', (): void => {
+    expect(
+      encode('5GrwvaEF5zXb26Fz9rcQpDWS57CtERHpNehXCPcNoHGKutQY', 68)
+    ).toEqual('7sL6eNJj5ZGV5cn3hhV2deRUsivXfBfMH76wCALCqWj1EKzv');
+  });
+
   it('fails when non-valid publicKey provided', (): void => {
     expect(
       (): string => encode(
diff --git a/packages/util-crypto/src/address/encode.ts b/packages/util-crypto/src/address/encode.ts
index 84f25d8dc5..b6b7de42c4 100644
--- a/packages/util-crypto/src/address/encode.ts
+++ b/packages/util-crypto/src/address/encode.ts
@@ -7,13 +7,15 @@ import { Prefix } from './types';
 // Original implementation: https://github.com/paritytech/polka-ui/blob/4858c094684769080f5811f32b081dd7780b0880/src/polkadot.js#L34
 
 import bs58 from 'bs58';
-import { assert, u8aConcat, u8aToBuffer, u8aToU8a } from '@polkadot/util';
+import { assert, u8aConcat, u8aToBuffer } from '@polkadot/util';
 
+import decode from './decode';
 import defaults from './defaults';
 import sshash from './sshash';
 
 export default function encode (_key: Uint8Array | string, prefix: Prefix = defaults.prefix): string {
-  const key = u8aToU8a(_key);
+  // decode it, this means we can re-encode an address
+  const key = decode(_key);
 
   assert(defaults.allowedDecodedLengths.includes(key.length), `Expected a valid key to convert, with length ${defaults.allowedDecodedLengths}`);
 
diff --git a/packages/util-crypto/src/address/index.ts b/packages/util-crypto/src/address/index.ts
index 538f271c3b..96cc1996a8 100644
--- a/packages/util-crypto/src/address/index.ts
+++ b/packages/util-crypto/src/address/index.ts
@@ -5,11 +5,11 @@
 import checkAddress from './check';
 import decodeAddress from './decode';
 import encodeAddress from './encode';
-import setAddressPrefix from './setPrefix';
+import setSS58Format from './setSS58Format';
 
 export {
   checkAddress,
   decodeAddress,
   encodeAddress,
-  setAddressPrefix
+  setSS58Format
 };
diff --git a/packages/util-crypto/src/address/setPrefix.spec.ts b/packages/util-crypto/src/address/setSS58Format.spec.ts
similarity index 79%
rename from packages/util-crypto/src/address/setPrefix.spec.ts
rename to packages/util-crypto/src/address/setSS58Format.spec.ts
index 469dd4c1e7..49e1268648 100644
--- a/packages/util-crypto/src/address/setPrefix.spec.ts
+++ b/packages/util-crypto/src/address/setSS58Format.spec.ts
@@ -3,11 +3,11 @@
 // of the Apache-2.0 license. See the LICENSE file for details.
 
 import encode from './encode';
-import setPrefix from './setPrefix';
+import setSS58Format from './setSS58Format';
 
-describe('setPrefix', (): void => {
+describe('setSS58Format', (): void => {
   beforeEach((): void => {
-    setPrefix(68);
+    setSS58Format(68);
   });
 
   it('sets and allows encoding using', (): void => {
diff --git a/packages/util-crypto/src/address/setPrefix.ts b/packages/util-crypto/src/address/setSS58Format.ts
similarity index 82%
rename from packages/util-crypto/src/address/setPrefix.ts
rename to packages/util-crypto/src/address/setSS58Format.ts
index 0e4ef7f0df..952fbce045 100644
--- a/packages/util-crypto/src/address/setPrefix.ts
+++ b/packages/util-crypto/src/address/setSS58Format.ts
@@ -6,6 +6,6 @@ import { Prefix } from './types';
 
 import defaults from './defaults';
 
-export default function setPrefix (prefix: Prefix): void {
+export default function setSS58Format (prefix: Prefix): void {
   defaults.prefix = prefix;
 }
diff --git a/packages/util-rlp/package.json b/packages/util-rlp/package.json
index 64391207ba..ff9e75dd64 100644
--- a/packages/util-rlp/package.json
+++ b/packages/util-rlp/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@polkadot/util-rlp",
-  "version": "1.4.0-beta.0",
+  "version": "1.4.0",
   "description": "RLP encoding and decoding",
   "main": "index.js",
   "keywords": [
@@ -28,7 +28,7 @@
   "homepage": "https://github.com/polkadot-js/common/tree/master/packages/util-rlp#readme",
   "dependencies": {
     "@babel/runtime": "^7.6.0",
-    "@polkadot/util": "^1.4.0-beta.0"
+    "@polkadot/util": "^1.4.0"
   },
   "devDependencies": {
     "ethereumjs-testing": "1.0.4"
diff --git a/packages/util/package.json b/packages/util/package.json
index 8ba624fced..cea1ecee8a 100644
--- a/packages/util/package.json
+++ b/packages/util/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@polkadot/util",
-  "version": "1.4.0-beta.0",
+  "version": "1.4.0",
   "description": "A collection of useful utilities for @polkadot",
   "main": "index.js",
   "keywords": [