diff --git a/config/protocol.mainnet.yml b/config/protocol.mainnet.yml
index a23e8ce86..7bdc12fdc 100644
--- a/config/protocol.mainnet.yml
+++ b/config/protocol.mainnet.yml
@@ -37,6 +37,7 @@ ProtocolConfiguration:
   P2PSigExtensions: false
   Hardforks:
     Aspidochelone: 1730000
+    Basilisk: 4120000
   NativeActivations:
     ContractManagement: [0]
     StdLib: [0]
diff --git a/config/protocol.testnet.yml b/config/protocol.testnet.yml
index f267e7127..c2148b447 100644
--- a/config/protocol.testnet.yml
+++ b/config/protocol.testnet.yml
@@ -40,6 +40,7 @@ ProtocolConfiguration:
   P2PSigExtensions: false
   Hardforks:
     Aspidochelone: 210000
+    Basilisk: 2680000
   NativeActivations:
     ContractManagement: [0]
     StdLib: [0]