diff --git a/Blase/lake-manifest.json b/Blase/lake-manifest.json
index d31e7d502f..49683a36ba 100644
--- a/Blase/lake-manifest.json
+++ b/Blase/lake-manifest.json
@@ -5,10 +5,10 @@
    "type": "git",
    "subDir": null,
    "scope": "",
-   "rev": "7d2e53aea6e90d6ff50f8081615c53963d000623",
+   "rev": "daa21570b791337ce33135a2d2acceab9c451734",
    "name": "mathlib",
    "manifestFile": "lake-manifest.json",
-   "inputRev": "nightly-testing-2025-10-26",
+   "inputRev": "nightly-testing-2025-10-27",
    "inherited": false,
    "configFile": "lakefile.lean"},
   {"url": "https://github.com/leanprover-community/plausible",
@@ -75,7 +75,7 @@
    "type": "git",
    "subDir": null,
    "scope": "leanprover-community",
-   "rev": "312c025b76d4430696680c4247bc31fc6b3bf3ca",
+   "rev": "bbf54fb01b6a8c8ae04303cc4fa815f8367be3de",
    "name": "batteries",
    "manifestFile": "lake-manifest.json",
    "inputRev": "nightly-testing",
diff --git a/Blase/lakefile.toml b/Blase/lakefile.toml
index 1daf2b1e91..2e66a25ae3 100644
--- a/Blase/lakefile.toml
+++ b/Blase/lakefile.toml
@@ -9,7 +9,7 @@ name = "Blase"
 [[require]]
 name = "mathlib"
 git = "https://github.com/leanprover-community/mathlib4-nightly-testing"
-rev = "nightly-testing-2025-10-26"
+rev = "nightly-testing-2025-10-27"
 
 [[lean_lib]]
 name = "BlaseTest"
diff --git a/LeanMLIR/lake-manifest.json b/LeanMLIR/lake-manifest.json
index a9cddf5275..aa77b1f665 100644
--- a/LeanMLIR/lake-manifest.json
+++ b/LeanMLIR/lake-manifest.json
@@ -5,10 +5,10 @@
    "type": "git",
    "subDir": null,
    "scope": "",
-   "rev": "7d2e53aea6e90d6ff50f8081615c53963d000623",
+   "rev": "daa21570b791337ce33135a2d2acceab9c451734",
    "name": "mathlib",
    "manifestFile": "lake-manifest.json",
-   "inputRev": "nightly-testing-2025-10-26",
+   "inputRev": "nightly-testing-2025-10-27",
    "inherited": false,
    "configFile": "lakefile.lean"},
   {"url": "https://github.com/leanprover-community/plausible",
@@ -75,7 +75,7 @@
    "type": "git",
    "subDir": null,
    "scope": "leanprover-community",
-   "rev": "312c025b76d4430696680c4247bc31fc6b3bf3ca",
+   "rev": "bbf54fb01b6a8c8ae04303cc4fa815f8367be3de",
    "name": "batteries",
    "manifestFile": "lake-manifest.json",
    "inputRev": "nightly-testing",
diff --git a/LeanMLIR/lakefile.toml b/LeanMLIR/lakefile.toml
index f2fa02c4d9..4dd00b29f2 100644
--- a/LeanMLIR/lakefile.toml
+++ b/LeanMLIR/lakefile.toml
@@ -8,4 +8,4 @@ name = "LeanMLIR"
 [[require]]
 name = "mathlib"
 git = "https://github.com/leanprover-community/mathlib4-nightly-testing"
-rev = "nightly-testing-2025-10-26"
+rev = "nightly-testing-2025-10-27"
diff --git a/lake-manifest.json b/lake-manifest.json
index a0681a31d3..e4b61ad822 100644
--- a/lake-manifest.json
+++ b/lake-manifest.json
@@ -46,10 +46,10 @@
    "type": "git",
    "subDir": null,
    "scope": "",
-   "rev": "7d2e53aea6e90d6ff50f8081615c53963d000623",
+   "rev": "daa21570b791337ce33135a2d2acceab9c451734",
    "name": "mathlib",
    "manifestFile": "lake-manifest.json",
-   "inputRev": "nightly-testing-2025-10-26",
+   "inputRev": "nightly-testing-2025-10-27",
    "inherited": true,
    "configFile": "lakefile.lean"},
   {"url": "https://github.com/leanprover-community/plausible",
@@ -116,7 +116,7 @@
    "type": "git",
    "subDir": null,
    "scope": "leanprover-community",
-   "rev": "312c025b76d4430696680c4247bc31fc6b3bf3ca",
+   "rev": "bbf54fb01b6a8c8ae04303cc4fa815f8367be3de",
    "name": "batteries",
    "manifestFile": "lake-manifest.json",
    "inputRev": "nightly-testing",
diff --git a/lean-toolchain b/lean-toolchain
index 94f180bed0..a057395f92 100644
--- a/lean-toolchain
+++ b/lean-toolchain
@@ -1 +1 @@
-leanprover/lean4:nightly-2025-10-26
\ No newline at end of file
+leanprover/lean4:nightly-2025-10-27
\ No newline at end of file