diff --git a/server/GameServer/Commands.lean b/server/GameServer/Commands.lean
index 9cdfc67..1b03b0a 100644
--- a/server/GameServer/Commands.lean
+++ b/server/GameServer/Commands.lean
@@ -313,7 +313,7 @@ partial def collectUsedInventory (stx : Syntax) (acc : UsedInventory := {}) : Co
           return {acc with definitions := acc.definitions.insertMany ns}
       ) acc
 
-#check expandOptDocComment?
+-- #check expandOptDocComment?
 
 /-- Define the statement of the current level. -/
 elab doc:docComment ? attrs:Parser.Term.attributes ?
diff --git a/server/lean-toolchain b/server/lean-toolchain
index 9b1d5d7..f0a6d66 100644
--- a/server/lean-toolchain
+++ b/server/lean-toolchain
@@ -1 +1 @@
-leanprover/lean4:v4.0.0-rc4
+leanprover/lean4:v4.0.0