diff --git a/packages/constants/src/chains.ts b/packages/constants/src/chains.ts
index 53a1417..c9c309a 100644
--- a/packages/constants/src/chains.ts
+++ b/packages/constants/src/chains.ts
@@ -4,6 +4,7 @@ export enum CHAINS {
   Mainnet = 1,
   Ropsten = 3,
   Rinkeby = 4,
+  Holesky = 17000,
   Goerli = 5,
   Kovan = 42,
   Kintsugi = 1337702,
@@ -20,6 +21,7 @@ export enum CHAINS {
 export const CHAINS_IDS = [
   CHAINS.Mainnet,
   CHAINS.Ropsten,
+  CHAINS.Holesky,
   CHAINS.Rinkeby,
   CHAINS.Goerli,
   CHAINS.Kovan,
@@ -32,6 +34,7 @@ export const CHAINS_COLORS: {
   [CHAINS.Ropsten]: '#ff4a8d',
   [CHAINS.Rinkeby]: '#f6c343',
   [CHAINS.Goerli]: '#3099f2',
+  [CHAINS.Holesky]: '#AA336A',
   [CHAINS.Kovan]: '#9064ff',
 };
 
diff --git a/packages/constants/src/tokens.ts b/packages/constants/src/tokens.ts
index 351a6c5..13fe136 100644
--- a/packages/constants/src/tokens.ts
+++ b/packages/constants/src/tokens.ts
@@ -28,6 +28,11 @@ export const TOKENS_BY_NETWORK: {
     [TOKENS.STETH]: '0x1643e812ae58766192cf7d2cf9567df2c37e9b7f',
     [TOKENS.LDO]: '0x56340274fB5a72af1A3C6609061c451De7961Bd4',
   },
+  [CHAINS.Holesky]: {
+    [TOKENS.WSTETH]: '0xHOLESKY_TODO',
+    [TOKENS.STETH]: '0xHOLESKY_TODO',
+    [TOKENS.LDO]: '0xHOLESKY_TODO',
+  },
 };
 
 export const getTokenAddress = (chainId: CHAINS, token: TOKENS): string => {
diff --git a/packages/constants/src/withdrawal_queue.ts b/packages/constants/src/withdrawal_queue.ts
index 04ae382..6125c07 100644
--- a/packages/constants/src/withdrawal_queue.ts
+++ b/packages/constants/src/withdrawal_queue.ts
@@ -6,6 +6,7 @@ export const WITHDRAWAL_QUEUE_BY_NETWORK: {
 } = {
   [CHAINS.Mainnet]: '0x889edC2eDab5f40e902b864aD4d7AdE8E412F9B1',
   [CHAINS.Goerli]: '0xCF117961421cA9e546cD7f50bC73abCdB3039533',
+  [CHAINS.Holesky]: '0xHOLESKY_TODO',
 };
 
 export const getWithdrawalQueueAddress = (chainId: CHAINS): string => {
diff --git a/packages/fetch/src/providersUrls.ts b/packages/fetch/src/providersUrls.ts
index 8510d31..03ba5c9 100644
--- a/packages/fetch/src/providersUrls.ts
+++ b/packages/fetch/src/providersUrls.ts
@@ -15,6 +15,8 @@ export const getInfuraRPCUrl = (chainId: CHAINS, apiKey: string): string => {
       return `https://goerli.infura.io/v3/${apiKey}`;
     case CHAINS.Kovan:
       return `https://kovan.infura.io/v3/${apiKey}`;
+    case CHAINS.Holesky:
+      return `0xHOLESKY_TODO`;
     default:
       invariant(false, 'Chain is not supported');
   }
@@ -34,6 +36,8 @@ export const getAlchemyRPCUrl = (chainId: CHAINS, apiKey: string): string => {
       return `https://eth-goerli.alchemyapi.io/v2/${apiKey}`;
     case CHAINS.Kovan:
       return `https://eth-kovan.alchemyapi.io/v2/${apiKey}`;
+    case CHAINS.Holesky:
+      return `0xHOLESKY_TODO`;
     default:
       invariant(false, 'Chain is not supported');
   }
diff --git a/packages/helpers/src/etherscan.ts b/packages/helpers/src/etherscan.ts
index 18cc3c7..fc1f9da 100644
--- a/packages/helpers/src/etherscan.ts
+++ b/packages/helpers/src/etherscan.ts
@@ -14,6 +14,7 @@ export const ETHERSCAN_PREFIX_BY_NETWORK: {
 } = {
   [CHAINS.Mainnet]: '',
   [CHAINS.Ropsten]: 'ropsten.',
+  [CHAINS.Holesky]: '0xHOLESKY_TODO',
   [CHAINS.Rinkeby]: 'rinkeby.',
   [CHAINS.Goerli]: 'goerli.',
   [CHAINS.Kovan]: 'kovan.',