diff --git a/CHANGELOG.md b/CHANGELOG.md
index b49566c09b..c0ce4439f3 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,12 @@
 # CHANGELOG
 
+## 3.7.3 Feb 2, 2021
+
+Changes:
+
+- Added Polkadot upgrade block for runtime 27 (known checkpoint optimization)
+
+
 ## 3.7.2 Feb 2, 2021
 
 Changes:
diff --git a/package.json b/package.json
index e8e6fe04cd..30b83c7f55 100644
--- a/package.json
+++ b/package.json
@@ -34,5 +34,5 @@
     "@types/jest": "^26.0.20",
     "copyfiles": "^2.4.1"
   },
-  "version": "3.7.3-1"
+  "version": "3.7.3"
 }
diff --git a/packages/api-contract/package.json b/packages/api-contract/package.json
index 61eeda46d7..3746f35f65 100644
--- a/packages/api-contract/package.json
+++ b/packages/api-contract/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@polkadot/api-contract",
-  "version": "3.7.3-1",
+  "version": "3.7.3",
   "description": "Interfaces for interacting with contracts and contract ABIs",
   "main": "index.js",
   "sideEffects": false,
@@ -13,10 +13,10 @@
   "homepage": "https://github.com/polkadot-js/api/tree/master/packages/api-contract#readme",
   "dependencies": {
     "@babel/runtime": "^7.12.5",
-    "@polkadot/api": "3.7.3-1",
-    "@polkadot/types": "3.7.3-1",
-    "@polkadot/util": "^5.5.1",
-    "@polkadot/x-rxjs": "^5.5.1",
+    "@polkadot/api": "3.7.3",
+    "@polkadot/types": "3.7.3",
+    "@polkadot/util": "^5.5.2",
+    "@polkadot/x-rxjs": "^5.5.2",
     "bn.js": "^4.11.9"
   }
 }
diff --git a/packages/api-derive/package.json b/packages/api-derive/package.json
index f28cd998ef..2755cfb9a5 100644
--- a/packages/api-derive/package.json
+++ b/packages/api-derive/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@polkadot/api-derive",
-  "version": "3.7.3-1",
+  "version": "3.7.3",
   "description": "Common functions used across Polkadot, derived from RPC calls and storage queries.",
   "main": "index.js",
   "sideEffects": false,
@@ -13,16 +13,16 @@
   "homepage": "https://github.com/polkadot-js/api/tree/master/packages/api-derive#readme",
   "dependencies": {
     "@babel/runtime": "^7.12.5",
-    "@polkadot/api": "3.7.3-1",
-    "@polkadot/rpc-core": "3.7.3-1",
-    "@polkadot/types": "3.7.3-1",
-    "@polkadot/util": "^5.5.1",
-    "@polkadot/util-crypto": "^5.5.1",
-    "@polkadot/x-rxjs": "^5.5.1",
+    "@polkadot/api": "3.7.3",
+    "@polkadot/rpc-core": "3.7.3",
+    "@polkadot/types": "3.7.3",
+    "@polkadot/util": "^5.5.2",
+    "@polkadot/util-crypto": "^5.5.2",
+    "@polkadot/x-rxjs": "^5.5.2",
     "bn.js": "^4.11.9"
   },
   "devDependencies": {
-    "@polkadot/keyring": "^5.5.1",
-    "@polkadot/rpc-provider": "3.7.3-1"
+    "@polkadot/keyring": "^5.5.2",
+    "@polkadot/rpc-provider": "3.7.3"
   }
 }
diff --git a/packages/api-derive/src/staking/stakerRewards.ts b/packages/api-derive/src/staking/stakerRewards.ts
index 32193de112..56ad016cae 100644
--- a/packages/api-derive/src/staking/stakerRewards.ts
+++ b/packages/api-derive/src/staking/stakerRewards.ts
@@ -10,7 +10,7 @@ import type { DeriveStakingQuery } from './types';
 
 import BN from 'bn.js';
 
-import { isFunction } from '@polkadot/util';
+import { BN_BILLION, BN_ZERO, isFunction } from '@polkadot/util';
 import { combineLatest, of } from '@polkadot/x-rxjs';
 import { map, switchMap } from '@polkadot/x-rxjs/operators';
 
@@ -18,29 +18,27 @@ import { memo } from '../util';
 
 type ErasResult = [{ unwrapOr: (value: BN) => BN }, DeriveEraPoints[], DeriveEraPrefs[], DeriveEraRewards[]];
 
-const ZERO = new BN(0);
 const MIN_ONE = new BN(-1);
-const COMM_DIV = new BN(1_000_000_000);
 
 function parseRewards (api: ApiInterfaceRx, stashId: AccountId, [, erasPoints, erasPrefs, erasRewards]: ErasResult, exposures: DeriveStakerExposure[]): DeriveStakerReward[] {
   return exposures.map(({ era, isEmpty, isValidator, nominating, validators: eraValidators }): DeriveStakerReward => {
-    const { eraPoints, validators: allValPoints } = erasPoints.find((p) => p.era.eq(era)) || { eraPoints: ZERO, validators: {} };
+    const { eraPoints, validators: allValPoints } = erasPoints.find((p) => p.era.eq(era)) || { eraPoints: BN_ZERO, validators: {} };
     const { eraReward } = erasRewards.find((r) => r.era.eq(era)) || { eraReward: api.registry.createType('Balance') };
     const { validators: allValPrefs } = erasPrefs.find((p) => p.era.eq(era)) || { validators: {} as DeriveEraValPrefs };
     const validators: Record<string, DeriveStakerRewardValidator> = {};
     const stakerId = stashId.toString();
 
     Object.entries(eraValidators).forEach(([validatorId, exposure]): void => {
-      const valPoints = allValPoints[validatorId] || ZERO;
-      const valComm = allValPrefs[validatorId]?.commission.unwrap() || ZERO;
+      const valPoints = allValPoints[validatorId] || BN_ZERO;
+      const valComm = allValPrefs[validatorId]?.commission.unwrap() || BN_ZERO;
       const expTotal = exposure.total.unwrap();
-      let avail = ZERO;
+      let avail = BN_ZERO;
       let value: BN | undefined;
 
       if (!(expTotal.isZero() || valPoints.isZero() || eraPoints.isZero())) {
         avail = eraReward.mul(valPoints).div(eraPoints);
 
-        const valCut = valComm.mul(avail).div(COMM_DIV);
+        const valCut = valComm.mul(avail).div(BN_BILLION);
         let staked: BN;
 
         if (validatorId === stakerId) {
@@ -50,10 +48,10 @@ function parseRewards (api: ApiInterfaceRx, stashId: AccountId, [, erasPoints, e
 
           staked = stakerExp
             ? stakerExp.value.unwrap()
-            : ZERO;
+            : BN_ZERO;
         }
 
-        value = avail.sub(valCut).imul(staked).div(expTotal).iadd(validatorId === stakerId ? valCut : ZERO);
+        value = avail.sub(valCut).imul(staked).div(expTotal).iadd(validatorId === stakerId ? valCut : BN_ZERO);
       }
 
       validators[validatorId] = {
@@ -181,7 +179,7 @@ export function _stakerRewards (instanceId: string, api: ApiInterfaceRx): (accou
 
         return withActive
           ? of(rewards)
-          : filterRewards(api, eras, { migrateEra: erasResult[0].unwrapOr(ZERO), rewards, stakingLedger });
+          : filterRewards(api, eras, { migrateEra: erasResult[0].unwrapOr(BN_ZERO), rewards, stakingLedger });
       })
     )
   );
diff --git a/packages/api/package.json b/packages/api/package.json
index adee5d5244..e8b4e73efa 100644
--- a/packages/api/package.json
+++ b/packages/api/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@polkadot/api",
-  "version": "3.7.3-1",
+  "version": "3.7.3",
   "description": "Promise and RxJS wrappers around the Polkadot JS RPC",
   "main": "index.js",
   "sideEffects": [
@@ -16,16 +16,16 @@
   "homepage": "https://github.com/polkadot-js/api/tree/master/packages/api#readme",
   "dependencies": {
     "@babel/runtime": "^7.12.5",
-    "@polkadot/api-derive": "3.7.3-1",
-    "@polkadot/keyring": "^5.5.1",
-    "@polkadot/metadata": "3.7.3-1",
-    "@polkadot/rpc-core": "3.7.3-1",
-    "@polkadot/rpc-provider": "3.7.3-1",
-    "@polkadot/types": "3.7.3-1",
-    "@polkadot/types-known": "3.7.3-1",
-    "@polkadot/util": "^5.5.1",
-    "@polkadot/util-crypto": "^5.5.1",
-    "@polkadot/x-rxjs": "^5.5.1",
+    "@polkadot/api-derive": "3.7.3",
+    "@polkadot/keyring": "^5.5.2",
+    "@polkadot/metadata": "3.7.3",
+    "@polkadot/rpc-core": "3.7.3",
+    "@polkadot/rpc-provider": "3.7.3",
+    "@polkadot/types": "3.7.3",
+    "@polkadot/types-known": "3.7.3",
+    "@polkadot/util": "^5.5.2",
+    "@polkadot/util-crypto": "^5.5.2",
+    "@polkadot/x-rxjs": "^5.5.2",
     "bn.js": "^4.11.9",
     "eventemitter3": "^4.0.7"
   }
diff --git a/packages/metadata/package.json b/packages/metadata/package.json
index a89540cc81..bd7bf4a9a5 100644
--- a/packages/metadata/package.json
+++ b/packages/metadata/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@polkadot/metadata",
-  "version": "3.7.3-1",
+  "version": "3.7.3",
   "description": "Helpers to extract information from runtime metadata",
   "main": "index.js",
   "sideEffects": [
@@ -16,13 +16,13 @@
   "homepage": "https://github.com/polkadot-js/api/tree/master/packages/type-metadata#readme",
   "dependencies": {
     "@babel/runtime": "^7.12.5",
-    "@polkadot/types": "3.7.3-1",
-    "@polkadot/types-known": "3.7.3-1",
-    "@polkadot/util": "^5.5.1",
-    "@polkadot/util-crypto": "^5.5.1",
+    "@polkadot/types": "3.7.3",
+    "@polkadot/types-known": "3.7.3",
+    "@polkadot/util": "^5.5.2",
+    "@polkadot/util-crypto": "^5.5.2",
     "bn.js": "^4.11.9"
   },
   "devDependencies": {
-    "@polkadot/keyring": "^5.5.1"
+    "@polkadot/keyring": "^5.5.2"
   }
 }
diff --git a/packages/rpc-core/package.json b/packages/rpc-core/package.json
index f986cdebca..0b5b01c2d4 100644
--- a/packages/rpc-core/package.json
+++ b/packages/rpc-core/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@polkadot/rpc-core",
-  "version": "3.7.3-1",
+  "version": "3.7.3",
   "description": "A JavaScript wrapper for the Polkadot JsonRPC interface",
   "main": "index.js",
   "sideEffects": false,
@@ -13,13 +13,13 @@
   "homepage": "https://github.com/polkadot-js/api/tree/master/packages/rpc-core#readme",
   "dependencies": {
     "@babel/runtime": "^7.12.5",
-    "@polkadot/metadata": "3.7.3-1",
-    "@polkadot/rpc-provider": "3.7.3-1",
-    "@polkadot/types": "3.7.3-1",
-    "@polkadot/util": "^5.5.1",
-    "@polkadot/x-rxjs": "^5.5.1"
+    "@polkadot/metadata": "3.7.3",
+    "@polkadot/rpc-provider": "3.7.3",
+    "@polkadot/types": "3.7.3",
+    "@polkadot/util": "^5.5.2",
+    "@polkadot/x-rxjs": "^5.5.2"
   },
   "devDependencies": {
-    "@polkadot/keyring": "^5.5.1"
+    "@polkadot/keyring": "^5.5.2"
   }
 }
diff --git a/packages/rpc-provider/package.json b/packages/rpc-provider/package.json
index 578ba559dd..d9b912011a 100644
--- a/packages/rpc-provider/package.json
+++ b/packages/rpc-provider/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@polkadot/rpc-provider",
-  "version": "3.7.3-1",
+  "version": "3.7.3",
   "description": "Transport providers for the API",
   "main": "index.js",
   "sideEffects": false,
@@ -13,18 +13,18 @@
   "homepage": "https://github.com/polkadot-js/api/tree/master/packages/rpc-provider#readme",
   "dependencies": {
     "@babel/runtime": "^7.12.5",
-    "@polkadot/types": "3.7.3-1",
-    "@polkadot/util": "^5.5.1",
-    "@polkadot/util-crypto": "^5.5.1",
-    "@polkadot/x-fetch": "^5.5.1",
-    "@polkadot/x-global": "^5.5.1",
-    "@polkadot/x-ws": "^5.5.1",
+    "@polkadot/types": "3.7.3",
+    "@polkadot/util": "^5.5.2",
+    "@polkadot/util-crypto": "^5.5.2",
+    "@polkadot/x-fetch": "^5.5.2",
+    "@polkadot/x-global": "^5.5.2",
+    "@polkadot/x-ws": "^5.5.2",
     "bn.js": "^4.11.9",
     "eventemitter3": "^4.0.7"
   },
   "devDependencies": {
-    "@polkadot/keyring": "^5.5.1",
-    "@polkadot/metadata": "3.7.3-1",
+    "@polkadot/keyring": "^5.5.2",
+    "@polkadot/metadata": "3.7.3",
     "mock-socket": "^9.0.3",
     "nock": "^13.0.7"
   }
diff --git a/packages/typegen/package.json b/packages/typegen/package.json
index dcd0f6aee9..9549910876 100644
--- a/packages/typegen/package.json
+++ b/packages/typegen/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@polkadot/typegen",
-  "version": "3.7.3-1",
+  "version": "3.7.3",
   "description": "Type generation scripts",
   "main": "index.js",
   "sideEffects": false,
@@ -22,11 +22,11 @@
     "@babel/core": "^7.12.10",
     "@babel/register": "^7.12.10",
     "@babel/runtime": "^7.12.5",
-    "@polkadot/api": "3.7.3-1",
-    "@polkadot/metadata": "3.7.3-1",
-    "@polkadot/rpc-provider": "3.7.3-1",
-    "@polkadot/types": "3.7.3-1",
-    "@polkadot/util": "^5.5.1",
+    "@polkadot/api": "3.7.3",
+    "@polkadot/metadata": "3.7.3",
+    "@polkadot/rpc-provider": "3.7.3",
+    "@polkadot/types": "3.7.3",
+    "@polkadot/util": "^5.5.2",
     "handlebars": "^4.7.6",
     "websocket": "^1.0.33",
     "yargs": "^16.2.0"
diff --git a/packages/types-known/package.json b/packages/types-known/package.json
index 0568553212..1fe7257d3d 100644
--- a/packages/types-known/package.json
+++ b/packages/types-known/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@polkadot/types-known",
-  "version": "3.7.3-1",
+  "version": "3.7.3",
   "description": "A JavaScript wrapper for the Polkadot JsonRPC interface",
   "main": "index.js",
   "sideEffects": false,
@@ -13,9 +13,9 @@
   "homepage": "https://github.com/polkadot-js/api/tree/master/packages/types-known#readme",
   "dependencies": {
     "@babel/runtime": "^7.12.5",
-    "@polkadot/networks": "^5.5.1",
-    "@polkadot/types": "3.7.3-1",
-    "@polkadot/util": "^5.5.1",
+    "@polkadot/networks": "^5.5.2",
+    "@polkadot/types": "3.7.3",
+    "@polkadot/util": "^5.5.2",
     "bn.js": "^4.11.9"
   },
   "devDependencies": {
diff --git a/packages/types-known/src/upgrades/index.spec.ts b/packages/types-known/src/upgrades/index.spec.ts
index 2ff4d57e89..1338ab33f2 100644
--- a/packages/types-known/src/upgrades/index.spec.ts
+++ b/packages/types-known/src/upgrades/index.spec.ts
@@ -5,44 +5,58 @@ import { assert, u8aEq } from '@polkadot/util';
 
 import all from '.';
 
+interface TestDef {
+  genesisHash: string;
+  network: string;
+  versions: [number, [number, number]][];
+}
+
+const TESTS: TestDef[] = [
+  {
+    genesisHash: '0xb0a8d493285c2df73290dfb7e61f870f17b41801197a149ca93654499ea3dafe',
+    network: 'kusama',
+    versions: [
+      [0, [0, 1020]],
+      [17, [901442, 1045]]
+    ]
+  },
+  {
+    genesisHash: '0x91b171bb158e2d3848fa23a9f1c25182fb8e20313b2c1eb49219da7a70ce90c3',
+    network: 'polkadot',
+    versions: [
+      [0, [0, 0]],
+      [19, [2436698, 26]]
+    ]
+  },
+  {
+    genesisHash: '0xe143f23803ac50e8f6f8e62695d1ce9e4e1d68aa36c1cd2cfd15340213f3423e',
+    network: 'westend',
+    versions: [
+      [0, [214356, 4]],
+      [23, [4207800, 48]]
+    ]
+  }
+];
+
 describe('upgrades', (): void => {
-  it('is valid', (): void => {
-    expect(all).toBeDefined();
-  });
+  TESTS.forEach(({ genesisHash, network, versions }): void => {
+    describe(network, (): void => {
+      const chain = all.find((n) => n.network === network);
 
-  it('has a valid entries for Kusama', (): void => {
-    const kusama = all.find(({ network }) => network === 'kusama');
+      assert(chain, `Unable to find the entry for ${network}`);
 
-    assert(kusama, 'Unable to find the entry for Kusama');
+      it('has a valid genesisHash', (): void => {
+        expect(u8aEq(chain.genesisHash, genesisHash)).toBe(true);
+      });
 
-    const version = kusama.versions[17];
+      versions.forEach(([index, [blockNumber, specVersion]]): void => {
+        it(`has a valid entry at index ${index}`, (): void => {
+          const version = chain.versions[index];
 
-    expect(u8aEq(kusama.genesisHash, '0xb0a8d493285c2df73290dfb7e61f870f17b41801197a149ca93654499ea3dafe')).toBe(true);
-    expect(version.blockNumber.eqn(901442)).toBe(true);
-    expect(version.specVersion.eqn(1045)).toBe(true);
-  });
-
-  it('has a valid entries for Polkadot', (): void => {
-    const polkadot = all.find(({ network }) => network === 'polkadot');
-
-    assert(polkadot, 'Unable to find the entry for Polkadot');
-
-    const version = polkadot.versions[19];
-
-    expect(u8aEq(polkadot.genesisHash, '0x91b171bb158e2d3848fa23a9f1c25182fb8e20313b2c1eb49219da7a70ce90c3')).toBe(true);
-    expect(version.blockNumber.eqn(2436698)).toBe(true);
-    expect(version.specVersion.eqn(26)).toBe(true);
-  });
-
-  it('has a valid entries for Westend', (): void => {
-    const westend = all.find(({ network }) => network === 'westend');
-
-    assert(westend, 'Unable to find the entry for Polkadot');
-
-    const version = westend.versions[23];
-
-    expect(u8aEq(westend.genesisHash, '0xe143f23803ac50e8f6f8e62695d1ce9e4e1d68aa36c1cd2cfd15340213f3423e')).toBe(true);
-    expect(version.blockNumber.eqn(4207800)).toBe(true);
-    expect(version.specVersion.eqn(48)).toBe(true);
+          expect(version.blockNumber.eqn(blockNumber)).toBe(true);
+          expect(version.specVersion.eqn(specVersion)).toBe(true);
+        });
+      });
+    });
   });
 });
diff --git a/packages/types-known/src/upgrades/index.ts b/packages/types-known/src/upgrades/index.ts
index 727f3e80e8..3a1e05865c 100644
--- a/packages/types-known/src/upgrades/index.ts
+++ b/packages/types-known/src/upgrades/index.ts
@@ -21,7 +21,7 @@ const NET_EXTRA: Record<string, { genesisHash: string[] }> = {
 };
 
 /** @internal */
-function checkOrder (network: string, versions: [number, number][]): [number, number][] {
+function checkOrder (network: string, versions: ChainUpgradesRaw): [number, number][] {
   const ooo = versions.filter((curr, index): boolean => {
     const prev = versions[index - 1];
 
@@ -36,7 +36,7 @@ function checkOrder (network: string, versions: [number, number][]): [number, nu
 }
 
 /** @internal */
-function rawToFinal (network: string, versions: ChainUpgradesRaw): ChainUpgrades {
+function mapRaw ([network, versions]: [string, ChainUpgradesRaw]): ChainUpgrades {
   const chain = networks.find((n) => n.network === network) || NET_EXTRA[network];
 
   assert(chain, `Unable to find info for chain ${network}`);
@@ -52,10 +52,6 @@ function rawToFinal (network: string, versions: ChainUpgradesRaw): ChainUpgrades
 }
 
 // Type overrides for specific spec types & versions as given in runtimeVersion
-const upgrades: ChainUpgrades[] = [
-  rawToFinal('kusama', kusama),
-  rawToFinal('polkadot', polkadot),
-  rawToFinal('westend', westend)
-];
+const upgrades = Object.entries({ kusama, polkadot, westend }).map(mapRaw);
 
 export default upgrades;
diff --git a/packages/types-known/src/upgrades/polkadot.ts b/packages/types-known/src/upgrades/polkadot.ts
index 914045452c..576f3211af 100644
--- a/packages/types-known/src/upgrades/polkadot.ts
+++ b/packages/types-known/src/upgrades/polkadot.ts
@@ -7,7 +7,8 @@ const upgrades: ChainUpgradesRaw = [
   [0, 0], [29231, 1], [188836, 5], [199405, 6], [214264, 7],
   [244358, 8], [303079, 9], [314201, 10], [342400, 11], [443963, 12],
   [528470, 13], [687751, 14], [746085, 15], [787923, 16], [799302, 17],
-  [1205128, 18], [1603423, 23], [1733218, 24], [2005673, 25], [2436698, 26]
+  [1205128, 18], [1603423, 23], [1733218, 24], [2005673, 25], [2436698, 26],
+  [3613564, 27]
 ];
 
 export default upgrades;
diff --git a/packages/types/package.json b/packages/types/package.json
index b814a849b1..d213c653b2 100644
--- a/packages/types/package.json
+++ b/packages/types/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@polkadot/types",
-  "version": "3.7.3-1",
+  "version": "3.7.3",
   "description": "Implementation of the Parity codec",
   "main": "index.js",
   "sideEffects": [
@@ -16,14 +16,14 @@
   "homepage": "https://github.com/polkadot-js/api/tree/master/packages/types#readme",
   "dependencies": {
     "@babel/runtime": "^7.12.5",
-    "@polkadot/metadata": "3.7.3-1",
-    "@polkadot/util": "^5.5.1",
-    "@polkadot/util-crypto": "^5.5.1",
-    "@polkadot/x-rxjs": "^5.5.1",
+    "@polkadot/metadata": "3.7.3",
+    "@polkadot/util": "^5.5.2",
+    "@polkadot/util-crypto": "^5.5.2",
+    "@polkadot/x-rxjs": "^5.5.2",
     "@types/bn.js": "^4.11.6",
     "bn.js": "^4.11.9"
   },
   "devDependencies": {
-    "@polkadot/keyring": "^5.5.1"
+    "@polkadot/keyring": "^5.5.2"
   }
 }
diff --git a/packages/types/src/codec/AbstractInt.ts b/packages/types/src/codec/AbstractInt.ts
index 7535bdad68..f77c7ffa6b 100644
--- a/packages/types/src/codec/AbstractInt.ts
+++ b/packages/types/src/codec/AbstractInt.ts
@@ -7,7 +7,7 @@ import type { UIntBitLength } from './types';
 
 import BN from 'bn.js';
 
-import { assert, BN_ZERO, bnToBn, bnToHex, bnToU8a, formatBalance, formatNumber, hexToBn, isHex, isString, isU8a, u8aToBn } from '@polkadot/util';
+import { assert, BN_BILLION, BN_HUNDRED, BN_MILLION, BN_ZERO, bnToBn, bnToHex, bnToU8a, formatBalance, formatNumber, hexToBn, isHex, isString, isU8a, u8aToBn } from '@polkadot/util';
 
 export const DEFAULT_UINT_BITS = 64;
 
@@ -18,9 +18,9 @@ const MUL_P = new BN(1_00_00);
 
 const FORMATTERS: [string, BN][] = [
   ['Perquintill', new BN(1_000_000_000_000)],
-  ['Perbill', new BN(1_000_000_000)],
-  ['Permill', new BN(1_000_000)],
-  ['Percent', new BN(100)]
+  ['Perbill', BN_BILLION],
+  ['Permill', BN_MILLION],
+  ['Percent', BN_HUNDRED]
 ];
 
 function toPercentage (value: BN, divisor: BN): string {
diff --git a/yarn.lock b/yarn.lock
index 964157b0f8..e152d0f3be 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1622,46 +1622,46 @@ __metadata:
   resolution: "@polkadot/api-contract@workspace:packages/api-contract"
   dependencies:
     "@babel/runtime": ^7.12.5
-    "@polkadot/api": 3.7.3-1
-    "@polkadot/types": 3.7.3-1
-    "@polkadot/util": ^5.5.1
-    "@polkadot/x-rxjs": ^5.5.1
+    "@polkadot/api": 3.7.3
+    "@polkadot/types": 3.7.3
+    "@polkadot/util": ^5.5.2
+    "@polkadot/x-rxjs": ^5.5.2
     bn.js: ^4.11.9
   languageName: unknown
   linkType: soft
 
-"@polkadot/api-derive@3.7.3-1, @polkadot/api-derive@workspace:packages/api-derive":
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   version: 0.0.0-use.local
   resolution: "@polkadot/api-derive@workspace:packages/api-derive"
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-    "@polkadot/api": 3.7.3-1
-    "@polkadot/keyring": ^5.5.1
-    "@polkadot/rpc-core": 3.7.3-1
-    "@polkadot/rpc-provider": 3.7.3-1
-    "@polkadot/types": 3.7.3-1
-    "@polkadot/util": ^5.5.1
-    "@polkadot/util-crypto": ^5.5.1
-    "@polkadot/x-rxjs": ^5.5.1
+    "@polkadot/api": 3.7.3
+    "@polkadot/keyring": ^5.5.2
+    "@polkadot/rpc-core": 3.7.3
+    "@polkadot/rpc-provider": 3.7.3
+    "@polkadot/types": 3.7.3
+    "@polkadot/util": ^5.5.2
+    "@polkadot/util-crypto": ^5.5.2
+    "@polkadot/x-rxjs": ^5.5.2
     bn.js: ^4.11.9
   languageName: unknown
   linkType: soft
 
-"@polkadot/api@3.7.3-1, @polkadot/api@workspace:packages/api":
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   version: 0.0.0-use.local
   resolution: "@polkadot/api@workspace:packages/api"
   dependencies:
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-    "@polkadot/metadata": 3.7.3-1
-    "@polkadot/rpc-core": 3.7.3-1
-    "@polkadot/rpc-provider": 3.7.3-1
-    "@polkadot/types": 3.7.3-1
-    "@polkadot/types-known": 3.7.3-1
-    "@polkadot/util": ^5.5.1
-    "@polkadot/util-crypto": ^5.5.1
-    "@polkadot/x-rxjs": ^5.5.1
+    "@polkadot/api-derive": 3.7.3
+    "@polkadot/keyring": ^5.5.2
+    "@polkadot/metadata": 3.7.3
+    "@polkadot/rpc-core": 3.7.3
+    "@polkadot/rpc-provider": 3.7.3
+    "@polkadot/types": 3.7.3
+    "@polkadot/types-known": 3.7.3
+    "@polkadot/util": ^5.5.2
+    "@polkadot/util-crypto": ^5.5.2
+    "@polkadot/x-rxjs": ^5.5.2
     bn.js: ^4.11.9
     eventemitter3: ^4.0.7
   languageName: unknown
@@ -1758,70 +1758,70 @@ __metadata:
   languageName: node
   linkType: hard
 
-"@polkadot/keyring@npm:^5.5.1":
-  version: 5.5.1
-  resolution: "@polkadot/keyring@npm:5.5.1"
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+  resolution: "@polkadot/keyring@npm:5.5.2"
   dependencies:
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-    "@polkadot/util": 5.5.1
-    "@polkadot/util-crypto": 5.5.1
+    "@polkadot/util": 5.5.2
+    "@polkadot/util-crypto": 5.5.2
   peerDependencies:
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-    "@polkadot/util-crypto": 5.5.1
-  checksum: 198e04b5121c154230a52bed57d358839fe2a5c59f54dcb49d7cc6b6c668c391d13221be3aabd36401c729e441c37d7df13aaaef9b590b01d0c80939ef86d64e
+    "@polkadot/util": 5.5.2
+    "@polkadot/util-crypto": 5.5.2
+  checksum: 7b21d5e92c34edf4bd619168af7381e43775c82996d9be6bd22a86b136da816ba2352dfb79b563b6f939ff823c2955c8fa00c4d6828c382437d22a07a72bfd74
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-"@polkadot/metadata@3.7.3-1, @polkadot/metadata@workspace:packages/metadata":
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   version: 0.0.0-use.local
   resolution: "@polkadot/metadata@workspace:packages/metadata"
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-    "@polkadot/types-known": 3.7.3-1
-    "@polkadot/util": ^5.5.1
-    "@polkadot/util-crypto": ^5.5.1
+    "@polkadot/keyring": ^5.5.2
+    "@polkadot/types": 3.7.3
+    "@polkadot/types-known": 3.7.3
+    "@polkadot/util": ^5.5.2
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     bn.js: ^4.11.9
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-  resolution: "@polkadot/networks@npm:5.5.1"
+"@polkadot/networks@npm:5.5.2, @polkadot/networks@npm:^5.5.2":
+  version: 5.5.2
+  resolution: "@polkadot/networks@npm:5.5.2"
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-  checksum: 4ccd3964adf039a68282168c6cb0d5611008867eece55c7c0308e5d448a0b42ee8c40cdafa0e54ab0017616d70a45188fd8cc64c6fc55ef47ceed7c90739cdd2
+  checksum: 8203fb953a8fca6e0a9bf7863c8d8262c714c2aed32f1dfedc0af08ee3c4224a51de56be832b6def94517d7cddcb33ca0a318bb8940500fd73cfc009404a4a6f
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-    "@polkadot/metadata": 3.7.3-1
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-    "@polkadot/types": 3.7.3-1
-    "@polkadot/util": ^5.5.1
-    "@polkadot/x-rxjs": ^5.5.1
+    "@polkadot/keyring": ^5.5.2
+    "@polkadot/metadata": 3.7.3
+    "@polkadot/rpc-provider": 3.7.3
+    "@polkadot/types": 3.7.3
+    "@polkadot/util": ^5.5.2
+    "@polkadot/x-rxjs": ^5.5.2
   languageName: unknown
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-"@polkadot/rpc-provider@3.7.3-1, @polkadot/rpc-provider@workspace:packages/rpc-provider":
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   version: 0.0.0-use.local
   resolution: "@polkadot/rpc-provider@workspace:packages/rpc-provider"
   dependencies:
     "@babel/runtime": ^7.12.5
-    "@polkadot/keyring": ^5.5.1
-    "@polkadot/metadata": 3.7.3-1
-    "@polkadot/types": 3.7.3-1
-    "@polkadot/util": ^5.5.1
-    "@polkadot/util-crypto": ^5.5.1
-    "@polkadot/x-fetch": ^5.5.1
-    "@polkadot/x-global": ^5.5.1
-    "@polkadot/x-ws": ^5.5.1
+    "@polkadot/keyring": ^5.5.2
+    "@polkadot/metadata": 3.7.3
+    "@polkadot/types": 3.7.3
+    "@polkadot/util": ^5.5.2
+    "@polkadot/util-crypto": ^5.5.2
+    "@polkadot/x-fetch": ^5.5.2
+    "@polkadot/x-global": ^5.5.2
+    "@polkadot/x-ws": ^5.5.2
     bn.js: ^4.11.9
     eventemitter3: ^4.0.7
     mock-socket: ^9.0.3
@@ -1845,11 +1845,11 @@ __metadata:
     "@babel/core": ^7.12.10
     "@babel/register": ^7.12.10
     "@babel/runtime": ^7.12.5
-    "@polkadot/api": 3.7.3-1
-    "@polkadot/metadata": 3.7.3-1
-    "@polkadot/rpc-provider": 3.7.3-1
-    "@polkadot/types": 3.7.3-1
-    "@polkadot/util": ^5.5.1
+    "@polkadot/api": 3.7.3
+    "@polkadot/metadata": 3.7.3
+    "@polkadot/rpc-provider": 3.7.3
+    "@polkadot/types": 3.7.3
+    "@polkadot/util": ^5.5.2
     "@types/websocket": ^1.0.1
     "@types/yargs": ^15.0.13
     handlebars: ^4.7.6
@@ -1864,43 +1864,43 @@ __metadata:
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   linkType: soft
 
-"@polkadot/types-known@3.7.3-1, @polkadot/types-known@workspace:packages/types-known":
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   version: 0.0.0-use.local
   resolution: "@polkadot/types-known@workspace:packages/types-known"
   dependencies:
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-    "@polkadot/networks": ^5.5.1
-    "@polkadot/types": 3.7.3-1
-    "@polkadot/util": ^5.5.1
+    "@polkadot/networks": ^5.5.2
+    "@polkadot/types": 3.7.3
+    "@polkadot/util": ^5.5.2
     "@types/bn.js": ^4.11.6
     bn.js: ^4.11.9
   languageName: unknown
   linkType: soft
 
-"@polkadot/types@3.7.3-1, @polkadot/types@workspace:packages/types":
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   resolution: "@polkadot/types@workspace:packages/types"
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-    "@polkadot/util": ^5.5.1
-    "@polkadot/util-crypto": ^5.5.1
-    "@polkadot/x-rxjs": ^5.5.1
+    "@polkadot/keyring": ^5.5.2
+    "@polkadot/metadata": 3.7.3
+    "@polkadot/util": ^5.5.2
+    "@polkadot/util-crypto": ^5.5.2
+    "@polkadot/x-rxjs": ^5.5.2
     "@types/bn.js": ^4.11.6
     bn.js: ^4.11.9
   languageName: unknown
   linkType: soft
 
-"@polkadot/util-crypto@npm:5.5.1, @polkadot/util-crypto@npm:^5.5.1":
-  version: 5.5.1
-  resolution: "@polkadot/util-crypto@npm:5.5.1"
+"@polkadot/util-crypto@npm:5.5.2, @polkadot/util-crypto@npm:^5.5.2":
+  version: 5.5.2
+  resolution: "@polkadot/util-crypto@npm:5.5.2"
   dependencies:
     "@babel/runtime": ^7.12.5
-    "@polkadot/networks": 5.5.1
-    "@polkadot/util": 5.5.1
+    "@polkadot/networks": 5.5.2
+    "@polkadot/util": 5.5.2
     "@polkadot/wasm-crypto": ^3.2.2
-    "@polkadot/x-randomvalues": 5.5.1
+    "@polkadot/x-randomvalues": 5.5.2
     base-x: ^3.0.8
     blakejs: ^1.1.0
     bn.js: ^4.11.9
@@ -1912,23 +1912,23 @@ __metadata:
     tweetnacl: ^1.0.3
     xxhashjs: ^0.2.2
   peerDependencies:
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+    "@polkadot/util": 5.5.2
+  checksum: ba1e67ecfdacc3818d0146cdc83ae720506d4803cd95c45b324479896050ddd264f98f3ceb573e0754d19aac6e9272bbbe3945eff4d2fd1088e605a36e5fdb6f
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-  resolution: "@polkadot/util@npm:5.5.1"
+"@polkadot/util@npm:5.5.2, @polkadot/util@npm:^5.5.2":
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+  resolution: "@polkadot/util@npm:5.5.2"
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-    "@polkadot/x-textdecoder": 5.5.1
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     "@types/bn.js": ^4.11.6
     bn.js: ^4.11.9
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     ip-regex: ^4.3.0
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