diff --git a/lake-manifest.json b/lake-manifest.json
index 45267c4b..44be680b 100644
--- a/lake-manifest.json
+++ b/lake-manifest.json
@@ -5,10 +5,10 @@
    "type": "git",
    "subDir": null,
    "scope": "leanprover-community",
-   "rev": "5352afccd6866369be9de43f5b7ec47203555f44",
+   "rev": "d2c3d9b0b4b1b2ae1514347b11b2945c4cbb0df5",
    "name": "mathlib",
    "manifestFile": "lake-manifest.json",
-   "inputRev": "v4.28.0-rc1",
+   "inputRev": "master",
    "inherited": false,
    "configFile": "lakefile.lean"},
   {"url": "https://github.com/leanprover-community/plausible",
diff --git a/lakefile.toml b/lakefile.toml
index 0bfbc2e3..81ea3e7d 100644
--- a/lakefile.toml
+++ b/lakefile.toml
@@ -16,7 +16,6 @@ weak.linter.allScriptsDocumented = false
 [[require]]
 name = "mathlib"
 scope = "leanprover-community"
-rev = "v4.28.0-rc1"
 
 [[lean_lib]]
 name = "Cslib"