diff --git a/lakefile.toml b/lakefile.toml
index f613939..7ee342a 100644
--- a/lakefile.toml
+++ b/lakefile.toml
@@ -14,7 +14,7 @@ rev = "main"
 [[require]]
 name = "batteries"
 scope = "leanprover-community"
-rev = "main"
+rev = "v4.16.0-rc2"
 
 [[lean_lib]]
 name = "ImportGraph"
diff --git a/lean-toolchain b/lean-toolchain
index 62ccd71..a3edb8f 100644
--- a/lean-toolchain
+++ b/lean-toolchain
@@ -1 +1 @@
-leanprover/lean4:v4.16.0-rc1
+leanprover/lean4:v4.16.0-rc2