diff --git a/4.html b/4.html
index 2a0c183..e5ecde9 100644
--- a/4.html
+++ b/4.html
@@ -62,6 +62,7 @@
 </head>
 <body>
 <h1>MetaMask Chain Management</h1>
+<button onclick="switchChain(11155111, 'Sepolia', 'https://sepolia.infura.io/v3', 'https://sepolia.etherscan.io', 'ETH')">Holesky</button>
 <button onclick="switchChain(17000, 'Holesky', 'https://ethereum-holesky-rpc.publicnode.com', 'https://holesky.etherscan.io', 'ETH')">Holesky</button>
 <button onclick="switchChain(9659, 'Parallel Testnet', 'https://rpc-accused-coffee-koala-b9fn1dik76.t.conduit.xyz', 'https://explorerl2new-accused-coffee-koala-b9fn1dik76.t.conduit.xyz', 'ETH')">Switch to Parallel Testnet</button>
 </body>
