diff --git a/lean-toolchain b/lean-toolchain
index b92a67ed54219..9740e141685dd 100644
--- a/lean-toolchain
+++ b/lean-toolchain
@@ -1 +1 @@
-leanprover/lean4:nightly-2024-05-07
+leanprover/lean4-pr-releases:pr-release-4066