diff --git a/lake-manifest.json b/lake-manifest.json
index 6926b8f2..c5dccace 100644
--- a/lake-manifest.json
+++ b/lake-manifest.json
@@ -58,7 +58,7 @@
   {"url": "https://github.com/leanprover-community/mathlib4.git",
    "type": "git",
    "subDir": null,
-   "rev": "dbaf55811cc1dd45a83c26c367094da1fe666707",
+   "rev": "9220d10df329407f9ddb9911812afacd2a7e1af2",
    "name": "mathlib",
    "manifestFile": "lake-manifest.json",
    "inputRev": null,