diff --git a/.Lib9c.Tests/Action/ActionContext.cs b/.Lib9c.Tests/Action/ActionContext.cs
index 6c9ad64c63..e2a6bcde6a 100644
--- a/.Lib9c.Tests/Action/ActionContext.cs
+++ b/.Lib9c.Tests/Action/ActionContext.cs
@@ -30,7 +30,7 @@ public class ActionContext : IActionContext
 
         public long BlockIndex { get; set; }
 
-        public int BlockProtocolVersion { get; set; }
+        public int BlockProtocolVersion { get; set; } = BlockMetadata.CurrentProtocolVersion;
 
         public IWorld PreviousState { get; set; }