diff --git a/lean-toolchain b/lean-toolchain
index eade7d1f7a..75db4cdc7a 100644
--- a/lean-toolchain
+++ b/lean-toolchain
@@ -1 +1 @@
-leanprover/lean4:nightly-2024-06-30
+leanprover/lean4-pr-releases:pr-release-4857