diff --git a/lean-toolchain b/lean-toolchain
index 9317a8e66d..886ada6852 100644
--- a/lean-toolchain
+++ b/lean-toolchain
@@ -1 +1 @@
-leanprover/lean4:nightly-2022-09-20
+leanprover/lean4:nightly-2022-09-28