diff --git a/.changeset/rude-maps-play.md b/.changeset/rude-maps-play.md
new file mode 100644
index 0000000000..ed44479840
--- /dev/null
+++ b/.changeset/rude-maps-play.md
@@ -0,0 +1,5 @@
+---
+"viem": patch
+---
+
+Added ZKsync config to Sophon testnet chain.
diff --git a/src/chains/definitions/sophonTestnet.ts b/src/chains/definitions/sophonTestnet.ts
index 47a2bc3c2d..c667d6db8d 100644
--- a/src/chains/definitions/sophonTestnet.ts
+++ b/src/chains/definitions/sophonTestnet.ts
@@ -1,6 +1,8 @@
 import { defineChain } from '../../utils/chain/defineChain.js'
+import { chainConfig } from '../../zksync/chainConfig.js'
 
 export const sophonTestnet = /*#__PURE__*/ defineChain({
+  ...chainConfig,
   id: 531_050_104,
   name: 'Sophon Testnet',
   nativeCurrency: {