diff --git a/client/src/request.rs b/client/src/request.rs
index 6d2ef6dc..1e8320c7 100644
--- a/client/src/request.rs
+++ b/client/src/request.rs
@@ -386,6 +386,11 @@ impl SuccinctClient {
             let client = Arc::new(SignerMiddleware::new(provider, wallet.clone()));
 
             let address = get_gateway_address(succinct_proof_data.chain_id);
+            info!(
+                "Could not find canonical gateway address for chain {}",
+                succinct_proof_data.chain_id
+            );
+
             // If gateway_address is provided, use that instead of the canonical gateway address.
             let mut gateway_address = gateway_address.or(address).expect(
                 "Gateway address must be provided when relaying a proof in local mode
diff --git a/client/src/utils.rs b/client/src/utils.rs
index 4bae4158..197f2834 100644
--- a/client/src/utils.rs
+++ b/client/src/utils.rs
@@ -1,9 +1,8 @@
 // List of Succinct Gateway addresses for chains.
-const GATEWAY_ADDRESSES: [(u32, &str); 8] = [
+const GATEWAY_ADDRESSES: [(u32, &str); 7] = [
     (1, "0x6e4f1e9ea315ebfd69d18c2db974eef6105fb803"),
     (5, "0x6e4f1e9ea315ebfd69d18c2db974eef6105fb803"),
     (100, "0x6e4f1e9ea315ebfd69d18c2db974eef6105fb803"),
-    (420, "0x6e4f1e9ea315ebfd69d18c2db974eef6105fb803"),
     (17000, "0x6e4f1e9ea315ebfd69d18c2db974eef6105fb803"),
     (42161, "0x2d27182206f0442885989626934ca9dd5290f979"),
     (421614, "0x2d27182206f0442885989626934ca9dd5290f979"),
diff --git a/contracts/README.md b/contracts/README.md
index 47db269f..f33b8c23 100644
--- a/contracts/README.md
+++ b/contracts/README.md
@@ -30,7 +30,6 @@ SUCCINCT_FEE_VAULT=[0x5999d401444f15d262fdce310bb68bd234de11aa](https://ethersca
 | Mainnet          | 1        | [0x6e4f1e9ea315ebfd69d18c2db974eef6105fb803](https://etherscan.io/address/0x6e4f1e9ea315ebfd69d18c2db974eef6105fb803)            |
 | Goerli           | 5        | [0x6e4f1e9ea315ebfd69d18c2db974eef6105fb803](https://goerli.etherscan.io/address/0x6e4f1e9ea315ebfd69d18c2db974eef6105fb803)     |
 | Gnosis           | 100      | [0x6e4f1e9eA315EBFd69d18C2DB974EEf6105FB803](https://gnosisscan.io/address/0x6e4f1e9eA315EBFd69d18C2DB974EEf6105FB803)           |
-| Optimism         | 420      | [0x6e4f1e9ea315ebfd69d18c2db974eef6105fb803](https://optimistic.etherscan.io/address/0x6e4f1e9ea315ebfd69d18c2db974eef6105fb803) |
 | Holesky          | 17000    | [0x6e4f1e9ea315ebfd69d18c2db974eef6105fb803](https://holesky.etherscan.io/address/0x6e4f1e9ea315ebfd69d18c2db974eef6105fb803)    |
 | Arbitrum         | 42161    | [0x2d27182206f0442885989626934ca9dd5290f979](https://arbiscan.io/address/0x2d27182206f0442885989626934ca9dd5290f979)             |
 | Arbitrum Sepolia | 421614   | [0x2d27182206f0442885989626934ca9dd5290f979](https://sepolia.arbiscan.io/address/0x2d27182206f0442885989626934ca9dd5290f979)     |