diff --git a/package.json b/package.json
index b67aa8f..1f6e009 100644
--- a/package.json
+++ b/package.json
@@ -54,7 +54,8 @@
     "build": "npm run build_server && npm run build_client",
     "build_server": "server/build.sh",
     "build_client": "NODE_ENV=production webpack",
-    "production": "NODE_ENV=production node server/index.mjs"
+    "production": "NODE_ENV=production node server/index.mjs",
+    "update_lean": "cd server && (cd testgame && lake update) && cp testgame/lean-toolchain leanserver/lean-toolchain"
   },
   "eslintConfig": {
     "extends": [
diff --git a/server/testgame/lake-manifest.json b/server/testgame/lake-manifest.json
index 06dba30..b2d80c3 100644
--- a/server/testgame/lake-manifest.json
+++ b/server/testgame/lake-manifest.json
@@ -28,9 +28,9 @@
   {"git":
    {"url": "https://github.com/leanprover-community/mathlib4.git",
     "subDir?": null,
-    "rev": "9b15aa6f091a623f992d6fff76167864794ce350",
+    "rev": "a461e549ebaac0c9b6a83969bcaa982bff6adafc",
     "name": "mathlib",
-    "inputRev?": "9b15aa6f091a623f992d6fff76167864794ce350"}},
+    "inputRev?": "master"}},
   {"git":
    {"url": "https://github.com/gebner/quote4",
     "subDir?": null,
@@ -40,7 +40,7 @@
   {"git":
    {"url": "https://github.com/JLimperg/aesop",
     "subDir?": null,
-    "rev": "70c59fcfc63de90786d59222c32468dab87964c5",
+    "rev": "ddced06b6b76483fe8794f2b516c57980a08fcef",
     "name": "aesop",
     "inputRev?": "master"}},
   {"git":
@@ -59,6 +59,6 @@
   {"git":
    {"url": "https://github.com/leanprover/std4",
     "subDir?": null,
-    "rev": "42bb39d34ec7dcb07580458efa4a7936bd5192b7",
+    "rev": "6196cf930a95664987eba8aee62ae7802d51428c",
     "name": "std",
     "inputRev?": "main"}}]}
diff --git a/server/testgame/lakefile.lean b/server/testgame/lakefile.lean
index c63997f..27631d6 100644
--- a/server/testgame/lakefile.lean
+++ b/server/testgame/lakefile.lean
@@ -4,7 +4,7 @@ open Lake DSL
 require GameServer from ".."/"leanserver"
 
 require mathlib from git
-  "https://github.com/leanprover-community/mathlib4.git"@"9b15aa6f091a623f992d6fff76167864794ce350"
+  "https://github.com/leanprover-community/mathlib4.git"@"master"
 
 --set_option tactic.hygienic false
 --set_option autoImplicit false