diff --git a/.changeset/swift-tips-know.md b/.changeset/swift-tips-know.md
new file mode 100644
index 0000000000..1d82d29154
--- /dev/null
+++ b/.changeset/swift-tips-know.md
@@ -0,0 +1,5 @@
+---
+"@hyperlane-xyz/sdk": patch
+---
+
+Use implementation instead of admin slot for isProxy
diff --git a/typescript/sdk/src/deploy/proxy.ts b/typescript/sdk/src/deploy/proxy.ts
index 8749e433a9..7d0763010b 100644
--- a/typescript/sdk/src/deploy/proxy.ts
+++ b/typescript/sdk/src/deploy/proxy.ts
@@ -69,8 +69,8 @@ export async function isProxy(
   provider: ethers.providers.Provider,
   proxy: Address,
 ): Promise<boolean> {
-  const admin = await proxyAdmin(provider, proxy);
-  return !eqAddress(admin, ethers.constants.AddressZero);
+  const implementation = await proxyImplementation(provider, proxy);
+  return !eqAddress(implementation, ethers.constants.AddressZero);
 }
 
 export function proxyAdminUpdateTxs(