diff --git a/lerna.json b/lerna.json
index 5db9ff8fb7..35834820e7 100644
--- a/lerna.json
+++ b/lerna.json
@@ -9,5 +9,5 @@
   "packages": [
     "packages/*"
   ],
-  "version": "1.2.0-beta.3"
+  "version": "1.2.0-beta.4"
 }
diff --git a/package.json b/package.json
index 6b3d059e98..91d74a76d1 100644
--- a/package.json
+++ b/package.json
@@ -1,5 +1,5 @@
 {
-  "version": "1.2.0-beta.3",
+  "version": "1.2.0-beta.4",
   "private": true,
   "engines": {
     "yarn": "^1.10.1"
diff --git a/packages/api-contract/package.json b/packages/api-contract/package.json
index fa80b012fb..ffb8240a2b 100644
--- a/packages/api-contract/package.json
+++ b/packages/api-contract/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@polkadot/api-contract",
-  "version": "1.2.0-beta.3",
+  "version": "1.2.0-beta.4",
   "description": "Interfaces for interacting with contracts and contract ABIs",
   "main": "index.js",
   "keywords": [
@@ -27,6 +27,6 @@
   "homepage": "https://github.com/polkadot-js/api/tree/master/packages/api-contract#readme",
   "dependencies": {
     "@babel/runtime": "^7.8.3",
-    "@polkadot/types": "^1.2.0-beta.3"
+    "@polkadot/types": "^1.2.0-beta.4"
   }
 }
diff --git a/packages/api-derive/package.json b/packages/api-derive/package.json
index ef40bb3e24..f4d93f3a2e 100644
--- a/packages/api-derive/package.json
+++ b/packages/api-derive/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@polkadot/api-derive",
-  "version": "1.2.0-beta.3",
+  "version": "1.2.0-beta.4",
   "description": "Common functions used across Polkadot, derived from RPC calls and storage queries.",
   "main": "index.js",
   "keywords": [
@@ -28,8 +28,8 @@
   "homepage": "https://github.com/polkadot-js/api/tree/master/packages/api-derive#readme",
   "dependencies": {
     "@babel/runtime": "^7.8.3",
-    "@polkadot/api": "^1.2.0-beta.3",
-    "@polkadot/types": "^1.2.0-beta.3"
+    "@polkadot/api": "^1.2.0-beta.4",
+    "@polkadot/types": "^1.2.0-beta.4"
   },
   "devDependencies": {
     "@polkadot/keyring": "^2.2.1"
diff --git a/packages/api/package.json b/packages/api/package.json
index 4ef28be6f6..09c0c50b66 100644
--- a/packages/api/package.json
+++ b/packages/api/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@polkadot/api",
-  "version": "1.2.0-beta.3",
+  "version": "1.2.0-beta.4",
   "description": "Promise and RxJS wrappers around the Polkadot JS RPC",
   "main": "index.js",
   "keywords": [
@@ -27,12 +27,12 @@
   "homepage": "https://github.com/polkadot-js/api/tree/master/packages/api#readme",
   "dependencies": {
     "@babel/runtime": "^7.8.3",
-    "@polkadot/api-derive": "^1.2.0-beta.3",
+    "@polkadot/api-derive": "^1.2.0-beta.4",
     "@polkadot/keyring": "^2.2.1",
-    "@polkadot/metadata": "^1.2.0-beta.3",
-    "@polkadot/rpc-core": "^1.2.0-beta.3",
-    "@polkadot/rpc-provider": "^1.2.0-beta.3",
-    "@polkadot/types": "^1.2.0-beta.3",
+    "@polkadot/metadata": "^1.2.0-beta.4",
+    "@polkadot/rpc-core": "^1.2.0-beta.4",
+    "@polkadot/rpc-provider": "^1.2.0-beta.4",
+    "@polkadot/types": "^1.2.0-beta.4",
     "@polkadot/util-crypto": "^2.2.1"
   },
   "devDependencies": {
diff --git a/packages/metadata/package.json b/packages/metadata/package.json
index fc9fa2f6b4..6c44566292 100644
--- a/packages/metadata/package.json
+++ b/packages/metadata/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@polkadot/metadata",
-  "version": "1.2.0-beta.3",
+  "version": "1.2.0-beta.4",
   "description": "Helpers to extract information from runtime metadata",
   "main": "index.js",
   "publishConfig": {
@@ -27,7 +27,7 @@
   "homepage": "https://github.com/polkadot-js/api/tree/master/packages/type-metadata#readme",
   "dependencies": {
     "@babel/runtime": "^7.8.3",
-    "@polkadot/types": "^1.2.0-beta.3",
+    "@polkadot/types": "^1.2.0-beta.4",
     "@polkadot/util": "^2.2.1",
     "@polkadot/util-crypto": "^2.2.1"
   },
diff --git a/packages/rpc-core/package.json b/packages/rpc-core/package.json
index d8ac72594a..92be8b048e 100644
--- a/packages/rpc-core/package.json
+++ b/packages/rpc-core/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@polkadot/rpc-core",
-  "version": "1.2.0-beta.3",
+  "version": "1.2.0-beta.4",
   "description": "A JavaScript wrapper for the Polkadot JsonRPC interface",
   "main": "index.js",
   "keywords": [
@@ -27,9 +27,9 @@
   "homepage": "https://github.com/polkadot-js/api/tree/master/packages/rpc-core#readme",
   "dependencies": {
     "@babel/runtime": "^7.8.3",
-    "@polkadot/jsonrpc": "^1.2.0-beta.3",
-    "@polkadot/rpc-provider": "^1.2.0-beta.3",
-    "@polkadot/types": "^1.2.0-beta.3",
+    "@polkadot/jsonrpc": "^1.2.0-beta.4",
+    "@polkadot/rpc-provider": "^1.2.0-beta.4",
+    "@polkadot/types": "^1.2.0-beta.4",
     "@polkadot/util": "^2.2.1",
     "rxjs": "^6.5.4"
   }
diff --git a/packages/rpc-provider/package.json b/packages/rpc-provider/package.json
index 6429d8412f..e6c680a1e7 100644
--- a/packages/rpc-provider/package.json
+++ b/packages/rpc-provider/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@polkadot/rpc-provider",
-  "version": "1.2.0-beta.3",
+  "version": "1.2.0-beta.4",
   "description": "Transport providers for the API",
   "main": "index.js",
   "keywords": [
@@ -27,7 +27,7 @@
   "homepage": "https://github.com/polkadot-js/api/tree/master/packages/rpc-provider#readme",
   "dependencies": {
     "@babel/runtime": "^7.8.3",
-    "@polkadot/metadata": "^1.2.0-beta.3",
+    "@polkadot/metadata": "^1.2.0-beta.4",
     "@polkadot/util": "^2.2.1",
     "@polkadot/util-crypto": "^2.2.1",
     "eventemitter3": "^4.0.0",
diff --git a/packages/type-jsonrpc/package.json b/packages/type-jsonrpc/package.json
index 058bb9ea07..e94da30a65 100644
--- a/packages/type-jsonrpc/package.json
+++ b/packages/type-jsonrpc/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@polkadot/jsonrpc",
-  "version": "1.2.0-beta.3",
+  "version": "1.2.0-beta.4",
   "description": "Method definitions for the Polkadot RPC layer",
   "main": "index.js",
   "publishConfig": {
diff --git a/packages/types/package.json b/packages/types/package.json
index 4592f4880a..a0e6882949 100644
--- a/packages/types/package.json
+++ b/packages/types/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@polkadot/types",
-  "version": "1.2.0-beta.3",
+  "version": "1.2.0-beta.4",
   "description": "Implementation of the Parity codec",
   "main": "index.js",
   "bin": {
@@ -31,7 +31,7 @@
   "homepage": "https://github.com/polkadot-js/api/tree/master/packages/types#readme",
   "dependencies": {
     "@babel/runtime": "^7.8.3",
-    "@polkadot/metadata": "^1.2.0-beta.3",
+    "@polkadot/metadata": "^1.2.0-beta.4",
     "@polkadot/util": "^2.2.1",
     "@polkadot/util-crypto": "^2.2.1",
     "memoizee": "^0.4.14",
diff --git a/packages/types/src/interfaceRegistry.ts b/packages/types/src/interfaceRegistry.ts
index 6e35ef9c2d..f34525f7a5 100644
--- a/packages/types/src/interfaceRegistry.ts
+++ b/packages/types/src/interfaceRegistry.ts
@@ -2,7 +2,7 @@
 /* eslint-disable @typescript-eslint/no-empty-interface */
 
 import { Compact, Option, Raw, Vec } from '@polkadot/types/codec';
-import { Bytes, Data, Fixed64, H160, H256, H512, IdentityFields, Null, StorageData, StorageKey, Text, Type, U256, bool, i128, i16, i256, i32, i64, i8, u128, u16, u256, u32, u64, u8, usize } from '@polkadot/types/primitive';
+import { BitVec, Bytes, Data, Fixed64, H160, H256, H512, IdentityFields, Null, StorageData, StorageKey, Text, Type, U256, bool, i128, i16, i256, i32, i64, i8, u128, u16, u256, u32, u64, u8, usize } from '@polkadot/types/primitive';
 import { AccountId, AccountIdOf, AccountIndex, Address, AssetId, Balance, BalanceOf, Block, BlockNumber, Call, ChangesTrieConfiguration, Consensus, ConsensusEngineId, Digest, DigestItem, DispatchClass, DispatchInfo, DispatchInfoTo190, EcdsaSignature, Ed25519Signature, Extrinsic, ExtrinsicEra, ExtrinsicPayload, ExtrinsicPayloadUnknown, ExtrinsicPayloadV1, ExtrinsicPayloadV2, ExtrinsicPayloadV3, ExtrinsicPayloadV4, ExtrinsicSignatureV1, ExtrinsicSignatureV2, ExtrinsicSignatureV3, ExtrinsicSignatureV4, ExtrinsicUnknown, ExtrinsicV1, ExtrinsicV2, ExtrinsicV3, ExtrinsicV4, Hash, Header, ImmortalEra, Index, Justification, KeyTypeId, KeyValue, LockIdentifier, LookupSource, LookupTarget, Moment, MortalEra, MultiSignature, Origin, Perbill, Percent, Permill, Perquintill, Phantom, PhantomData, PreRuntime, Seal, SealV0, Signature, SignedBlock, SignerPayload, Sr25519Signature, ValidatorId, Weight, WeightMultiplier } from '@polkadot/types/interfaces/runtime';
 import { InclusionHeight, Uncle, UncleEntryItem } from '@polkadot/types/interfaces/authorship';
 import { RawAuraPreDigest } from '@polkadot/types/interfaces/aura';
@@ -39,6 +39,9 @@ export interface InterfaceRegistry {
   bool: bool;
   'Option<bool>': Option<bool>;
   'Vec<bool>': Vec<bool>;
+  BitVec: BitVec;
+  'Option<BitVec>': Option<BitVec>;
+  'Vec<BitVec>': Vec<BitVec>;
   Bytes: Bytes;
   'Option<Bytes>': Option<Bytes>;
   'Vec<Bytes>': Vec<Bytes>;