diff --git a/core/starknet/chain.go b/core/starknet/chain.go
index 8e9c4b7..0bb268e 100644
--- a/core/starknet/chain.go
+++ b/core/starknet/chain.go
@@ -345,7 +345,3 @@ func (c *Chain) IsContractAddressDeployed(contractAddress string) (b *base.Optio
 	deployed := nonce != nil
 	return base.NewOptionalBool(deployed), nil
 }
-
-func (c *Chain) IsContractAddressUpgraded(contractAddress string) (b *base.OptionalBool, err error) {
-	return
-}