diff --git a/lerna.json b/lerna.json
index 559304f306..6926f0829e 100644
--- a/lerna.json
+++ b/lerna.json
@@ -9,5 +9,5 @@
   "packages": [
     "packages/*"
   ],
-  "version": "1.16.1"
+  "version": "1.17.0-beta.0"
 }
diff --git a/packages/api-contract/package.json b/packages/api-contract/package.json
index 5bb3a259c7..f5f5b06124 100644
--- a/packages/api-contract/package.json
+++ b/packages/api-contract/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@polkadot/api-contract",
-  "version": "1.16.1",
+  "version": "1.17.0-beta.0",
   "description": "Interfaces for interacting with contracts and contract ABIs",
   "main": "index.js",
   "keywords": [
@@ -27,9 +27,9 @@
   "homepage": "https://github.com/polkadot-js/api/tree/master/packages/api-contract#readme",
   "dependencies": {
     "@babel/runtime": "^7.9.6",
-    "@polkadot/api": "1.16.1",
-    "@polkadot/rpc-core": "1.16.1",
-    "@polkadot/types": "1.16.1",
+    "@polkadot/api": "1.17.0-beta.0",
+    "@polkadot/rpc-core": "1.17.0-beta.0",
+    "@polkadot/types": "1.17.0-beta.0",
     "@polkadot/util": "^2.11.1",
     "bn.js": "^5.1.2",
     "rxjs": "^6.5.5"
diff --git a/packages/api-derive/package.json b/packages/api-derive/package.json
index 81155c9084..a3b702a40c 100644
--- a/packages/api-derive/package.json
+++ b/packages/api-derive/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@polkadot/api-derive",
-  "version": "1.16.1",
+  "version": "1.17.0-beta.0",
   "description": "Common functions used across Polkadot, derived from RPC calls and storage queries.",
   "main": "index.js",
   "keywords": [
@@ -28,10 +28,10 @@
   "homepage": "https://github.com/polkadot-js/api/tree/master/packages/api-derive#readme",
   "dependencies": {
     "@babel/runtime": "^7.9.6",
-    "@polkadot/api": "1.16.1",
-    "@polkadot/rpc-core": "1.16.1",
-    "@polkadot/rpc-provider": "1.16.1",
-    "@polkadot/types": "1.16.1",
+    "@polkadot/api": "1.17.0-beta.0",
+    "@polkadot/rpc-core": "1.17.0-beta.0",
+    "@polkadot/rpc-provider": "1.17.0-beta.0",
+    "@polkadot/types": "1.17.0-beta.0",
     "@polkadot/util": "^2.11.1",
     "@polkadot/util-crypto": "^2.11.1",
     "bn.js": "^5.1.2",
diff --git a/packages/api/package.json b/packages/api/package.json
index fe028c70e0..7a594a0522 100644
--- a/packages/api/package.json
+++ b/packages/api/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@polkadot/api",
-  "version": "1.16.1",
+  "version": "1.17.0-beta.0",
   "description": "Promise and RxJS wrappers around the Polkadot JS RPC",
   "main": "index.js",
   "keywords": [
@@ -27,13 +27,13 @@
   "homepage": "https://github.com/polkadot-js/api/tree/master/packages/api#readme",
   "dependencies": {
     "@babel/runtime": "^7.9.6",
-    "@polkadot/api-derive": "1.16.1",
+    "@polkadot/api-derive": "1.17.0-beta.0",
     "@polkadot/keyring": "^2.11.1",
-    "@polkadot/metadata": "1.16.1",
-    "@polkadot/rpc-core": "1.16.1",
-    "@polkadot/rpc-provider": "1.16.1",
-    "@polkadot/types": "1.16.1",
-    "@polkadot/types-known": "1.16.1",
+    "@polkadot/metadata": "1.17.0-beta.0",
+    "@polkadot/rpc-core": "1.17.0-beta.0",
+    "@polkadot/rpc-provider": "1.17.0-beta.0",
+    "@polkadot/types": "1.17.0-beta.0",
+    "@polkadot/types-known": "1.17.0-beta.0",
     "@polkadot/util": "^2.11.1",
     "@polkadot/util-crypto": "^2.11.1",
     "bn.js": "^5.1.2",
diff --git a/packages/metadata/package.json b/packages/metadata/package.json
index e735d519eb..b38fb86f01 100644
--- a/packages/metadata/package.json
+++ b/packages/metadata/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@polkadot/metadata",
-  "version": "1.16.1",
+  "version": "1.17.0-beta.0",
   "description": "Helpers to extract information from runtime metadata",
   "main": "index.js",
   "publishConfig": {
@@ -27,8 +27,8 @@
   "homepage": "https://github.com/polkadot-js/api/tree/master/packages/type-metadata#readme",
   "dependencies": {
     "@babel/runtime": "^7.9.6",
-    "@polkadot/types": "1.16.1",
-    "@polkadot/types-known": "1.16.1",
+    "@polkadot/types": "1.17.0-beta.0",
+    "@polkadot/types-known": "1.17.0-beta.0",
     "@polkadot/util": "^2.11.1",
     "@polkadot/util-crypto": "^2.11.1",
     "bn.js": "^5.1.2"
diff --git a/packages/rpc-core/package.json b/packages/rpc-core/package.json
index e20494f33e..868d5aa77e 100644
--- a/packages/rpc-core/package.json
+++ b/packages/rpc-core/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@polkadot/rpc-core",
-  "version": "1.16.1",
+  "version": "1.17.0-beta.0",
   "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": "^7.9.6",
-    "@polkadot/metadata": "1.16.1",
-    "@polkadot/rpc-provider": "1.16.1",
-    "@polkadot/types": "1.16.1",
+    "@polkadot/metadata": "1.17.0-beta.0",
+    "@polkadot/rpc-provider": "1.17.0-beta.0",
+    "@polkadot/types": "1.17.0-beta.0",
     "@polkadot/util": "^2.11.1",
     "memoizee": "^0.4.14",
     "rxjs": "^6.5.5"
diff --git a/packages/rpc-provider/package.json b/packages/rpc-provider/package.json
index dc5b2a4f5e..c198759d28 100644
--- a/packages/rpc-provider/package.json
+++ b/packages/rpc-provider/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@polkadot/rpc-provider",
-  "version": "1.16.1",
+  "version": "1.17.0-beta.0",
   "description": "Transport providers for the API",
   "main": "index.js",
   "keywords": [
@@ -27,8 +27,8 @@
   "homepage": "https://github.com/polkadot-js/api/tree/master/packages/rpc-provider#readme",
   "dependencies": {
     "@babel/runtime": "^7.9.6",
-    "@polkadot/metadata": "1.16.1",
-    "@polkadot/types": "1.16.1",
+    "@polkadot/metadata": "1.17.0-beta.0",
+    "@polkadot/types": "1.17.0-beta.0",
     "@polkadot/util": "^2.11.1",
     "@polkadot/util-crypto": "^2.11.1",
     "bn.js": "^5.1.2",
diff --git a/packages/typegen/package.json b/packages/typegen/package.json
index de0ef630a5..6495ab2850 100644
--- a/packages/typegen/package.json
+++ b/packages/typegen/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@polkadot/typegen",
-  "version": "1.16.1",
+  "version": "1.17.0-beta.0",
   "description": "Type generation scripts",
   "main": "index.js",
   "bin": {
@@ -36,10 +36,10 @@
     "@babel/core": "^7.9.6",
     "@babel/register": "^7.9.0",
     "@babel/runtime": "^7.9.6",
-    "@polkadot/api": "1.16.1",
-    "@polkadot/metadata": "1.16.1",
-    "@polkadot/rpc-provider": "1.16.1",
-    "@polkadot/types": "1.16.1",
+    "@polkadot/api": "1.17.0-beta.0",
+    "@polkadot/metadata": "1.17.0-beta.0",
+    "@polkadot/rpc-provider": "1.17.0-beta.0",
+    "@polkadot/types": "1.17.0-beta.0",
     "@polkadot/util": "^2.11.1",
     "handlebars": "^4.7.6",
     "websocket": "^1.0.31",
diff --git a/packages/types-known/package.json b/packages/types-known/package.json
index d5aa44e381..6718cb7b57 100644
--- a/packages/types-known/package.json
+++ b/packages/types-known/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@polkadot/types-known",
-  "version": "1.16.1",
+  "version": "1.17.0-beta.0",
   "description": "A JavaScript wrapper for the Polkadot JsonRPC interface",
   "main": "index.js",
   "keywords": [
@@ -27,7 +27,7 @@
   "homepage": "https://github.com/polkadot-js/api/tree/master/packages/types-known#readme",
   "dependencies": {
     "@babel/runtime": "^7.9.6",
-    "@polkadot/types": "1.16.1",
+    "@polkadot/types": "1.17.0-beta.0",
     "@polkadot/util": "^2.11.1",
     "bn.js": "^5.1.2"
   },
diff --git a/packages/types/package.json b/packages/types/package.json
index 82677e40a1..ae42ef8767 100644
--- a/packages/types/package.json
+++ b/packages/types/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@polkadot/types",
-  "version": "1.16.1",
+  "version": "1.17.0-beta.0",
   "description": "Implementation of the Parity codec",
   "main": "index.js",
   "keywords": [
@@ -27,7 +27,7 @@
   "homepage": "https://github.com/polkadot-js/api/tree/master/packages/types#readme",
   "dependencies": {
     "@babel/runtime": "^7.9.6",
-    "@polkadot/metadata": "1.16.1",
+    "@polkadot/metadata": "1.17.0-beta.0",
     "@polkadot/util": "^2.11.1",
     "@polkadot/util-crypto": "^2.11.1",
     "@types/bn.js": "^4.11.6",
diff --git a/packages/types/src/interfaces/staking/types.ts b/packages/types/src/interfaces/staking/types.ts
index 977e1b459d..2a6e7c6a38 100644
--- a/packages/types/src/interfaces/staking/types.ts
+++ b/packages/types/src/interfaces/staking/types.ts
@@ -52,8 +52,8 @@ export interface ElectionResult extends Struct {
 
 /** @name ElectionSize */
 export interface ElectionSize extends Struct {
-  readonly validators: ValidatorIndex;
-  readonly nominators: NominatorIndex;
+  readonly validators: Compact<ValidatorIndex>;
+  readonly nominators: Compact<NominatorIndex>;
 }
 
 /** @name ElectionStatus */
diff --git a/yarn.lock b/yarn.lock
index 65eae02f64..0dd881c5cb 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -2641,25 +2641,25 @@ __metadata:
   resolution: "@polkadot/api-contract@workspace:packages/api-contract"
   dependencies:
     "@babel/runtime": ^7.9.6
-    "@polkadot/api": 1.16.1
-    "@polkadot/rpc-core": 1.16.1
-    "@polkadot/types": 1.16.1
+    "@polkadot/api": 1.17.0-beta.0
+    "@polkadot/rpc-core": 1.17.0-beta.0
+    "@polkadot/types": 1.17.0-beta.0
     "@polkadot/util": ^2.11.1
     bn.js: ^5.1.2
     rxjs: ^6.5.5
   languageName: unknown
   linkType: soft
 
-"@polkadot/api-derive@1.16.1, @polkadot/api-derive@workspace:packages/api-derive":
+"@polkadot/api-derive@1.17.0-beta.0, @polkadot/api-derive@workspace:packages/api-derive":
   version: 0.0.0-use.local
   resolution: "@polkadot/api-derive@workspace:packages/api-derive"
   dependencies:
     "@babel/runtime": ^7.9.6
-    "@polkadot/api": 1.16.1
+    "@polkadot/api": 1.17.0-beta.0
     "@polkadot/keyring": ^2.11.1
-    "@polkadot/rpc-core": 1.16.1
-    "@polkadot/rpc-provider": 1.16.1
-    "@polkadot/types": 1.16.1
+    "@polkadot/rpc-core": 1.17.0-beta.0
+    "@polkadot/rpc-provider": 1.17.0-beta.0
+    "@polkadot/types": 1.17.0-beta.0
     "@polkadot/util": ^2.11.1
     "@polkadot/util-crypto": ^2.11.1
     bn.js: ^5.1.2
@@ -2668,18 +2668,18 @@ __metadata:
   languageName: unknown
   linkType: soft
 
-"@polkadot/api@1.16.1, @polkadot/api@workspace:packages/api":
+"@polkadot/api@1.17.0-beta.0, @polkadot/api@workspace:packages/api":
   version: 0.0.0-use.local
   resolution: "@polkadot/api@workspace:packages/api"
   dependencies:
     "@babel/runtime": ^7.9.6
-    "@polkadot/api-derive": 1.16.1
+    "@polkadot/api-derive": 1.17.0-beta.0
     "@polkadot/keyring": ^2.11.1
-    "@polkadot/metadata": 1.16.1
-    "@polkadot/rpc-core": 1.16.1
-    "@polkadot/rpc-provider": 1.16.1
-    "@polkadot/types": 1.16.1
-    "@polkadot/types-known": 1.16.1
+    "@polkadot/metadata": 1.17.0-beta.0
+    "@polkadot/rpc-core": 1.17.0-beta.0
+    "@polkadot/rpc-provider": 1.17.0-beta.0
+    "@polkadot/types": 1.17.0-beta.0
+    "@polkadot/types-known": 1.17.0-beta.0
     "@polkadot/util": ^2.11.1
     "@polkadot/util-crypto": ^2.11.1
     bn.js: ^5.1.2
@@ -2786,43 +2786,43 @@ __metadata:
   languageName: node
   linkType: hard
 
-"@polkadot/metadata@1.16.1, @polkadot/metadata@workspace:packages/metadata":
+"@polkadot/metadata@1.17.0-beta.0, @polkadot/metadata@workspace:packages/metadata":
   version: 0.0.0-use.local
   resolution: "@polkadot/metadata@workspace:packages/metadata"
   dependencies:
     "@babel/runtime": ^7.9.6
     "@polkadot/keyring": ^2.11.1
-    "@polkadot/types": 1.16.1
-    "@polkadot/types-known": 1.16.1
+    "@polkadot/types": 1.17.0-beta.0
+    "@polkadot/types-known": 1.17.0-beta.0
     "@polkadot/util": ^2.11.1
     "@polkadot/util-crypto": ^2.11.1
     bn.js: ^5.1.2
   languageName: unknown
   linkType: soft
 
-"@polkadot/rpc-core@1.16.1, @polkadot/rpc-core@workspace:packages/rpc-core":
+"@polkadot/rpc-core@1.17.0-beta.0, @polkadot/rpc-core@workspace:packages/rpc-core":
   version: 0.0.0-use.local
   resolution: "@polkadot/rpc-core@workspace:packages/rpc-core"
   dependencies:
     "@babel/runtime": ^7.9.6
     "@polkadot/keyring": ^2.11.1
-    "@polkadot/metadata": 1.16.1
-    "@polkadot/rpc-provider": 1.16.1
-    "@polkadot/types": 1.16.1
+    "@polkadot/metadata": 1.17.0-beta.0
+    "@polkadot/rpc-provider": 1.17.0-beta.0
+    "@polkadot/types": 1.17.0-beta.0
     "@polkadot/util": ^2.11.1
     memoizee: ^0.4.14
     rxjs: ^6.5.5
   languageName: unknown
   linkType: soft
 
-"@polkadot/rpc-provider@1.16.1, @polkadot/rpc-provider@workspace:packages/rpc-provider":
+"@polkadot/rpc-provider@1.17.0-beta.0, @polkadot/rpc-provider@workspace:packages/rpc-provider":
   version: 0.0.0-use.local
   resolution: "@polkadot/rpc-provider@workspace:packages/rpc-provider"
   dependencies:
     "@babel/runtime": ^7.9.6
     "@polkadot/keyring": ^2.11.1
-    "@polkadot/metadata": 1.16.1
-    "@polkadot/types": 1.16.1
+    "@polkadot/metadata": 1.17.0-beta.0
+    "@polkadot/types": 1.17.0-beta.0
     "@polkadot/util": ^2.11.1
     "@polkadot/util-crypto": ^2.11.1
     bn.js: ^5.1.2
@@ -2850,10 +2850,10 @@ __metadata:
     "@babel/core": ^7.9.6
     "@babel/register": ^7.9.0
     "@babel/runtime": ^7.9.6
-    "@polkadot/api": 1.16.1
-    "@polkadot/metadata": 1.16.1
-    "@polkadot/rpc-provider": 1.16.1
-    "@polkadot/types": 1.16.1
+    "@polkadot/api": 1.17.0-beta.0
+    "@polkadot/metadata": 1.17.0-beta.0
+    "@polkadot/rpc-provider": 1.17.0-beta.0
+    "@polkadot/types": 1.17.0-beta.0
     "@polkadot/util": ^2.11.1
     "@types/websocket": ^1.0.0
     "@types/yargs": ^15.0.5
@@ -2869,25 +2869,25 @@ __metadata:
   languageName: unknown
   linkType: soft
 
-"@polkadot/types-known@1.16.1, @polkadot/types-known@workspace:packages/types-known":
+"@polkadot/types-known@1.17.0-beta.0, @polkadot/types-known@workspace:packages/types-known":
   version: 0.0.0-use.local
   resolution: "@polkadot/types-known@workspace:packages/types-known"
   dependencies:
     "@babel/runtime": ^7.9.6
-    "@polkadot/types": 1.16.1
+    "@polkadot/types": 1.17.0-beta.0
     "@polkadot/util": ^2.11.1
     "@types/bn.js": ^4.11.6
     bn.js: ^5.1.2
   languageName: unknown
   linkType: soft
 
-"@polkadot/types@1.16.1, @polkadot/types@workspace:packages/types":
+"@polkadot/types@1.17.0-beta.0, @polkadot/types@workspace:packages/types":
   version: 0.0.0-use.local
   resolution: "@polkadot/types@workspace:packages/types"
   dependencies:
     "@babel/runtime": ^7.9.6
     "@polkadot/keyring": ^2.11.1
-    "@polkadot/metadata": 1.16.1
+    "@polkadot/metadata": 1.17.0-beta.0
     "@polkadot/util": ^2.11.1
     "@polkadot/util-crypto": ^2.11.1
     "@types/bn.js": ^4.11.6