diff --git a/packages/sdk/CHANGELOG.md b/packages/sdk/CHANGELOG.md
index 7dce448e..393e46d3 100644
--- a/packages/sdk/CHANGELOG.md
+++ b/packages/sdk/CHANGELOG.md
@@ -1,3 +1,15 @@
+# 3.2.0
+
+## SDK
+
+### Added
+
+- `Sepolia` testnet
+
+## Playground
+
+- Support for `Sepolia` testnet
+
 # 3.1.0
 
 ## SDK
diff --git a/packages/sdk/src/common/constants.ts b/packages/sdk/src/common/constants.ts
index e3f76e42..3709bb53 100644
--- a/packages/sdk/src/common/constants.ts
+++ b/packages/sdk/src/common/constants.ts
@@ -1,10 +1,11 @@
 import { type Address, type Chain } from 'viem';
-import { goerli, mainnet, holesky } from 'viem/chains';
+import { goerli, mainnet, holesky, sepolia } from 'viem/chains';
 
 export enum CHAINS {
   Goerli = 5,
   Mainnet = 1,
   Holesky = 17000,
+  Sepolia = 11155111,
 }
 
 export const APPROX_BLOCKS_BY_DAY = 7600n;
@@ -13,6 +14,7 @@ export const SUPPORTED_CHAINS: CHAINS[] = [
   CHAINS.Goerli,
   CHAINS.Mainnet,
   CHAINS.Holesky,
+  CHAINS.Sepolia,
 ];
 
 export const SUBMIT_EXTRA_GAS_TRANSACTION_RATIO = 1.05;
@@ -25,6 +27,7 @@ export const LIDO_LOCATOR_BY_CHAIN: {
   [CHAINS.Mainnet]: '0xC1d0b3DE6792Bf6b4b37EccdcC24e45978Cfd2Eb',
   [CHAINS.Goerli]: '0x1eDf09b5023DC86737b59dE68a8130De878984f5',
   [CHAINS.Holesky]: '0x28FAB2059C713A7F9D8c86Db49f9bb0e96Af1ef8',
+  [CHAINS.Sepolia]: '0x8f6254332f69557A72b0DA2D5F0Bc07d4CA991E7',
 };
 
 export const SUBRGRAPH_ID_BY_CHAIN: {
@@ -33,6 +36,7 @@ export const SUBRGRAPH_ID_BY_CHAIN: {
   [CHAINS.Mainnet]: 'Sxx812XgeKyzQPaBpR5YZWmGV5fZuBaPdh7DFhzSwiQ',
   [CHAINS.Goerli]: 'QmeDfGTuNbSoZ71zi3Ch4WNRbzALfiFPnJMYUFPinLiFNa',
   [CHAINS.Holesky]: null,
+  [CHAINS.Sepolia]: null,
 };
 
 export const EARLIEST_TOKEN_REBASED_EVENT: {
@@ -41,6 +45,7 @@ export const EARLIEST_TOKEN_REBASED_EVENT: {
   [CHAINS.Mainnet]: 17272708n,
   [CHAINS.Goerli]: 8712039n,
   [CHAINS.Holesky]: 52174n,
+  [CHAINS.Sepolia]: 5434668n,
 } as const;
 
 export const LIDO_TOKENS = {
@@ -104,4 +109,5 @@ export const VIEM_CHAINS: { [key in CHAINS]: Chain } = {
   [CHAINS.Mainnet]: mainnet,
   [CHAINS.Goerli]: goerli,
   [CHAINS.Holesky]: holesky,
+  [CHAINS.Sepolia]: sepolia,
 };
diff --git a/playground/components/layout/header/headerWallet.tsx b/playground/components/layout/header/headerWallet.tsx
index d40bc607..f4527ea1 100644
--- a/playground/components/layout/header/headerWallet.tsx
+++ b/playground/components/layout/header/headerWallet.tsx
@@ -11,12 +11,17 @@ import { HeaderWalletChainStyle } from './headerWalletStyles';
 
 const HeaderWallet: FC = () => {
   const { active, chainId } = useWeb3();
-  const chainName = chainId && CHAINS[chainId];
+  // TODO: update @lido-sdk/constants
+  const chainName = chainId && { ...CHAINS, 11155111: 'Sepolia' }[chainId];
+  const isSepolia = chainId === 11155111;
 
   return (
     <>
       {chainId && (
-        <HeaderWalletChainStyle $color={getChainColor(chainId)}>
+        <HeaderWalletChainStyle
+          // TODO: update @lido-sdk/constants -> getChainColor
+          $color={isSepolia ? '#FFD700' : getChainColor(chainId)}
+        >
           {chainName}
         </HeaderWalletChainStyle>
       )}
diff --git a/playground/env-dynamics.mjs b/playground/env-dynamics.mjs
index 4ce7269d..7b7ad3bf 100644
--- a/playground/env-dynamics.mjs
+++ b/playground/env-dynamics.mjs
@@ -3,11 +3,12 @@ export const rpcProviderUrls = {
   1: process.env[`RPC_PROVIDER_URL_1`],
   5: process.env[`RPC_PROVIDER_URL_5`],
   17000: process.env[`RPC_PROVIDER_URL_17000`],
+  11155111: process.env[`RPC_PROVIDER_URL_11155111`],
 };
 /** @type number */
 export const defaultChain = parseInt(process.env.DEFAULT_CHAIN, 10) || 17000;
 /** @type number[] */
 export const supportedChains = process.env?.SUPPORTED_CHAINS?.split(',').map(
   (chainId) => parseInt(chainId, 10),
-) ?? [1, 5, 17000];
+) ?? [1, 5, 17000, 11155111];
 export const walletconnectProjectId = process.env.WALLETCONNECT_PROJECT_ID;
diff --git a/playground/providers/web3.tsx b/playground/providers/web3.tsx
index 8d826d4d..46e3d844 100644
--- a/playground/providers/web3.tsx
+++ b/playground/providers/web3.tsx
@@ -57,6 +57,8 @@ const Web3Provider: FC<PropsWithChildren> = ({ children }) => {
       [CHAINS.Mainnet]: getRpc(CHAINS.Mainnet),
       [CHAINS.Goerli]: getRpc(CHAINS.Goerli),
       [CHAINS.Holesky]: getRpc(CHAINS.Holesky),
+      // TODO: update @lido-sdk/constants
+      11155111: getRpc(11155111),
     };
   }, [customRpc]);