diff --git a/lake-manifest.json b/lake-manifest.json
index a67a52c2e..e698d93e7 100644
--- a/lake-manifest.json
+++ b/lake-manifest.json
@@ -5,10 +5,10 @@
    "type": "git",
    "subDir": null,
    "scope": "",
-   "rev": "79d7f185699e521a83a71453dfb776e4df893a04",
+   "rev": "b8ea9d6cb91d63c921f550050047d1f465a3b8b1",
    "name": "mathlib",
    "manifestFile": "lake-manifest.json",
-   "inputRev": "nightly-testing-2026-05-11",
+   "inputRev": "nightly-testing-2026-05-12",
    "inherited": false,
    "configFile": "lakefile.lean"},
   {"url": "https://github.com/leanprover-community/plausible",
@@ -75,7 +75,7 @@
    "type": "git",
    "subDir": null,
    "scope": "leanprover-community",
-   "rev": "c566127911e3b1176bd9a67136897c9c9f96a67c",
+   "rev": "191399b3ada5086a9235ec2fb5b5e52f5da9ffab",
    "name": "batteries",
    "manifestFile": "lake-manifest.json",
    "inputRev": "nightly-testing",
diff --git a/lakefile.toml b/lakefile.toml
index c206f1948..9607c0c0a 100644
--- a/lakefile.toml
+++ b/lakefile.toml
@@ -18,7 +18,7 @@ weak.linter.unicodeLinter = false
 [[require]]
 name = "mathlib"
 git = "https://github.com/leanprover-community/mathlib4-nightly-testing"
-rev = "nightly-testing-2026-05-11"
+rev = "nightly-testing-2026-05-12"
 
 [[lean_lib]]
 name = "Cslib"
diff --git a/lean-toolchain b/lean-toolchain
index 7baa6a52b..2e82a844a 100644
--- a/lean-toolchain
+++ b/lean-toolchain
@@ -1 +1 @@
-leanprover/lean4:nightly-2026-05-11
+leanprover/lean4:nightly-2026-05-12