diff --git a/docs/METHODS_EXTRINSICS.md b/docs/METHODS_EXTRINSICS.md
index 9bdcd2f9e5..03ab45cd21 100644
--- a/docs/METHODS_EXTRINSICS.md
+++ b/docs/METHODS_EXTRINSICS.md
@@ -217,7 +217,7 @@ ___
 
 ### imOnline
 
-▸ **heartbeat**(heartbeat: `Heartbeat`, signature: `AuthoritySignature`)
+▸ **heartbeat**(heartbeat: `Heartbeat`, signature: `Signature`)
 
 ___
 
diff --git a/lerna.json b/lerna.json
index 46d3e73d91..7ae751a5c2 100644
--- a/lerna.json
+++ b/lerna.json
@@ -9,5 +9,5 @@
   "packages": [
     "packages/*"
   ],
-  "version": "0.91.0-beta.11"
+  "version": "0.91.0-beta.12"
 }
diff --git a/package.json b/package.json
index 79a1c9a5ef..fc95ad46d3 100644
--- a/package.json
+++ b/package.json
@@ -1,5 +1,5 @@
 {
-  "version": "0.91.0-beta.11",
+  "version": "0.91.0-beta.12",
   "private": true,
   "engines": {
     "yarn": "^1.10.1"
diff --git a/packages/api-contract/package.json b/packages/api-contract/package.json
index a2d39e3cd6..5c2cb5168c 100644
--- a/packages/api-contract/package.json
+++ b/packages/api-contract/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@polkadot/api-contract",
-  "version": "0.91.0-beta.11",
+  "version": "0.91.0-beta.12",
   "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": "^7.5.5",
-    "@polkadot/types": "^0.91.0-beta.11"
+    "@polkadot/types": "^0.91.0-beta.12"
   }
 }
diff --git a/packages/api-derive/package.json b/packages/api-derive/package.json
index 88bc0bf51e..e3a114f4a5 100644
--- a/packages/api-derive/package.json
+++ b/packages/api-derive/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@polkadot/api-derive",
-  "version": "0.91.0-beta.11",
+  "version": "0.91.0-beta.12",
   "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": "^7.5.5",
-    "@polkadot/api": "^0.91.0-beta.11",
-    "@polkadot/types": "^0.91.0-beta.11"
+    "@polkadot/api": "^0.91.0-beta.12",
+    "@polkadot/types": "^0.91.0-beta.12"
   },
   "devDependencies": {
     "@polkadot/keyring": "^1.2.0-beta.6"
diff --git a/packages/api-metadata/package.json b/packages/api-metadata/package.json
index 1b5a934db9..cff8babcc4 100644
--- a/packages/api-metadata/package.json
+++ b/packages/api-metadata/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@polkadot/api-metadata",
-  "version": "0.91.0-beta.11",
+  "version": "0.91.0-beta.12",
   "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": "^7.5.5",
-    "@polkadot/types": "^0.91.0-beta.11",
+    "@polkadot/types": "^0.91.0-beta.12",
     "@polkadot/util": "^1.2.0-beta.6",
     "@polkadot/util-crypto": "^1.2.0-beta.6"
   },
diff --git a/packages/api/package.json b/packages/api/package.json
index 0781b76b89..8d0e3dc2dc 100644
--- a/packages/api/package.json
+++ b/packages/api/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@polkadot/api",
-  "version": "0.91.0-beta.11",
+  "version": "0.91.0-beta.12",
   "description": "Promise and RxJS wrappers around the Polkadot JS RPC",
   "main": "index.js",
   "keywords": [
@@ -27,11 +27,11 @@
   "homepage": "https://github.com/polkadot-js/api/tree/master/packages/api#readme",
   "dependencies": {
     "@babel/runtime": "^7.5.5",
-    "@polkadot/api-derive": "^0.91.0-beta.11",
-    "@polkadot/api-metadata": "^0.91.0-beta.11",
-    "@polkadot/rpc-core": "^0.91.0-beta.11",
-    "@polkadot/rpc-provider": "^0.91.0-beta.11",
-    "@polkadot/types": "^0.91.0-beta.11",
+    "@polkadot/api-derive": "^0.91.0-beta.12",
+    "@polkadot/api-metadata": "^0.91.0-beta.12",
+    "@polkadot/rpc-core": "^0.91.0-beta.12",
+    "@polkadot/rpc-provider": "^0.91.0-beta.12",
+    "@polkadot/types": "^0.91.0-beta.12",
     "@polkadot/util-crypto": "^1.2.0-beta.6"
   },
   "devDependencies": {
diff --git a/packages/rpc-core/package.json b/packages/rpc-core/package.json
index fadb0a0569..bd8643294e 100644
--- a/packages/rpc-core/package.json
+++ b/packages/rpc-core/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@polkadot/rpc-core",
-  "version": "0.91.0-beta.11",
+  "version": "0.91.0-beta.12",
   "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": "^7.5.5",
-    "@polkadot/jsonrpc": "^0.91.0-beta.11",
-    "@polkadot/rpc-provider": "^0.91.0-beta.11",
-    "@polkadot/types": "^0.91.0-beta.11",
+    "@polkadot/jsonrpc": "^0.91.0-beta.12",
+    "@polkadot/rpc-provider": "^0.91.0-beta.12",
+    "@polkadot/types": "^0.91.0-beta.12",
     "@polkadot/util": "^1.2.0-beta.6",
     "rxjs": "^6.5.2"
   }
diff --git a/packages/rpc-provider/package.json b/packages/rpc-provider/package.json
index 5e8ef1df9f..a74d5f2b2f 100644
--- a/packages/rpc-provider/package.json
+++ b/packages/rpc-provider/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@polkadot/rpc-provider",
-  "version": "0.91.0-beta.11",
+  "version": "0.91.0-beta.12",
   "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": "^7.5.5",
-    "@polkadot/api-metadata": "^0.91.0-beta.11",
+    "@polkadot/api-metadata": "^0.91.0-beta.12",
     "@polkadot/util": "^1.2.0-beta.6",
     "@polkadot/util-crypto": "^1.2.0-beta.6",
     "@types/nock": "^10.0.3",
diff --git a/packages/type-jsonrpc/package.json b/packages/type-jsonrpc/package.json
index 48dc442eec..37f1cc4156 100644
--- a/packages/type-jsonrpc/package.json
+++ b/packages/type-jsonrpc/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@polkadot/jsonrpc",
-  "version": "0.91.0-beta.11",
+  "version": "0.91.0-beta.12",
   "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 a4ebfe1d02..60f52c2c3c 100644
--- a/packages/types/package.json
+++ b/packages/types/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@polkadot/types",
-  "version": "0.91.0-beta.11",
+  "version": "0.91.0-beta.12",
   "description": "Implementation of the Parity codec",
   "main": "index.js",
   "keywords": [