diff --git a/server/lean-toolchain b/server/lean-toolchain
index 7f0fd43..fd602c4 100644
--- a/server/lean-toolchain
+++ b/server/lean-toolchain
@@ -1 +1 @@
-leanprover/lean4:nightly-2023-03-09
+leanprover/lean4:nightly-2023-06-20