diff --git a/base/mainnet.go b/base/mainnet.go
index e88cc43..a860a0c 100644
--- a/base/mainnet.go
+++ b/base/mainnet.go
@@ -37,7 +37,7 @@ var (
 	ARBITRUM uint64 = 19
 	NEO3     uint64 = 88
 	XDAI     uint64 = 20
-	OPTIMISM uint64 = 200007
+	OPTIMISM uint64 = 23
 	FANTOM   uint64 = 22
 	AVA      uint64 = 21