diff --git a/.Libplanet b/.Libplanet
index 3731ca4f9a..866c901166 160000
--- a/.Libplanet
+++ b/.Libplanet
@@ -1 +1 @@
-Subproject commit 3731ca4f9a94c3182283e72216eadbcb42f212e5
+Subproject commit 866c901166f62fbf6e3294afb4ca779f76656073
diff --git a/Lib9c.Policy/Policy/DebugPolicy.cs b/Lib9c.Policy/Policy/DebugPolicy.cs
index 996a910428..e10765da2f 100644
--- a/Lib9c.Policy/Policy/DebugPolicy.cs
+++ b/Lib9c.Policy/Policy/DebugPolicy.cs
@@ -14,7 +14,7 @@ public DebugPolicy()
         {
         }
 
-        public PolicyActionsRegistry PolicyActionsRegistry { get; } = new PolicyActionsRegistry();
+        public IPolicyActionsRegistry PolicyActionsRegistry { get; } = new PolicyActionsRegistry();
 
         public TxPolicyViolationException ValidateNextBlockTx(
             BlockChain blockChain, Transaction transaction)