diff --git a/src/prefix-for-network.ts b/src/prefix-for-network.ts
index 6ab49bf..34d898e 100644
--- a/src/prefix-for-network.ts
+++ b/src/prefix-for-network.ts
@@ -10,6 +10,9 @@ export = function getPrefixForNetwork(networkId: string): string | null {
     case 5: // goerli test net
       prefix = 'goerli.';
       break;
+    case 11155111: // sepolia test net
+      prefix = 'sepolia.';
+      break;
     default:
       prefix = null;
   }