diff --git a/server/lean-toolchain b/server/lean-toolchain
index dc4c3b8..9b1d5d7 100644
--- a/server/lean-toolchain
+++ b/server/lean-toolchain
@@ -1 +1 @@
-leanprover/lean4:nightly-2023-08-03
+leanprover/lean4:v4.0.0-rc4