diff --git a/lean-toolchain b/lean-toolchain
index 71fb096c63..eb6c49442f 100644
--- a/lean-toolchain
+++ b/lean-toolchain
@@ -1 +1 @@
-leanprover/lean4:nightly-2024-08-31
+leanprover/lean4-pr-releases:pr-release-5231