diff --git a/lean-toolchain b/lean-toolchain
index 7c2b6c2..abadd14 100644
--- a/lean-toolchain
+++ b/lean-toolchain
@@ -1 +1 @@
-leanprover/lean4:nightly-2022-02-17
+leanprover/lean4:nightly-2022-02-27