diff --git a/.changeset/famous-deers-mate.md b/.changeset/famous-deers-mate.md
new file mode 100644
index 0000000..7b23f4a
--- /dev/null
+++ b/.changeset/famous-deers-mate.md
@@ -0,0 +1,5 @@
+---
+"@delvtech/evm-client": patch
+---
+
+Add txHash to onTransactionMined
diff --git a/packages/evm-client/src/contract/types/Contract.ts b/packages/evm-client/src/contract/types/Contract.ts
index d044d84..0d94c82 100644
--- a/packages/evm-client/src/contract/types/Contract.ts
+++ b/packages/evm-client/src/contract/types/Contract.ts
@@ -167,7 +167,7 @@ export interface ContractWriteOptions {
   /**
    * A callback for when the transaction has been mined.
    */
-  onTransactionMined?(): void;
+  onTransactionMined?(hash: `0x${string}`): void;
 }
 
 export type ContractWriteArgs<