diff --git a/SSA/Experimental/Bits/AutoStructs/FormulaToAuto.lean b/SSA/Experimental/Bits/AutoStructs/FormulaToAuto.lean
index 79d918eeb..1bb1bea14 100644
--- a/SSA/Experimental/Bits/AutoStructs/FormulaToAuto.lean
+++ b/SSA/Experimental/Bits/AutoStructs/FormulaToAuto.lean
@@ -20,8 +20,7 @@ open AutoStructs
 open Mathlib
 
 @[simp] theorem Language.mem_setOf_eq {x : List α} {p : List α → Prop} :
-    @Membership.mem (List α) (Language α) instMembershipListLanguage {y | p y} x = p x := by
-  rfl
+    @Membership.mem (List α) (Language α) Language.instMembershipList {y | p y} x = p x := rfl
 
 @[simp] theorem Language.trivial : x ∈ (⊤ : Language α) := by trivial
 
diff --git a/lake-manifest.json b/lake-manifest.json
index f0838b743..8060d2c2a 100644
--- a/lake-manifest.json
+++ b/lake-manifest.json
@@ -25,10 +25,10 @@
    "type": "git",
    "subDir": null,
    "scope": "",
-   "rev": "63618639886f3bea1260812a0e5b81aebdc8cc60",
+   "rev": "ed546d89ba3b9fa2c93b3501b9f6aac3593c930d",
    "name": "mathlib",
    "manifestFile": "lake-manifest.json",
-   "inputRev": "nightly-testing-2024-12-22",
+   "inputRev": "nightly-testing-2024-12-23",
    "inherited": false,
    "configFile": "lakefile.lean"},
   {"url": "https://github.com/leanprover-community/plausible",
@@ -95,7 +95,7 @@
    "type": "git",
    "subDir": null,
    "scope": "leanprover-community",
-   "rev": "1a278069eda32a2dc0ce4d59eeb77d318373d10e",
+   "rev": "6b16a9378726331e9f4b1a044dbda82261b2cfef",
    "name": "batteries",
    "manifestFile": "lake-manifest.json",
    "inputRev": "nightly-testing",
diff --git a/lakefile.toml b/lakefile.toml
index 2fc8eaf9c..71f519add 100644
--- a/lakefile.toml
+++ b/lakefile.toml
@@ -4,7 +4,7 @@ defaultTargets = ["SSA"]
 [[require]]
 name = "mathlib"
 git = "https://github.com/leanprover-community/mathlib4"
-rev = "nightly-testing-2024-12-22"
+rev = "nightly-testing-2024-12-23"
 
 [[require]]
 name = "Cli"
diff --git a/lean-toolchain b/lean-toolchain
index ce85f8691..c0d8a978e 100644
--- a/lean-toolchain
+++ b/lean-toolchain
@@ -1 +1 @@
-leanprover/lean4:nightly-2024-12-22
+leanprover/lean4:nightly-2024-12-23