diff --git a/SSA/Projects/InstCombine/ForLean.lean b/SSA/Projects/InstCombine/ForLean.lean
index 09c426a40..8b2e9d980 100644
--- a/SSA/Projects/InstCombine/ForLean.lean
+++ b/SSA/Projects/InstCombine/ForLean.lean
@@ -514,25 +514,7 @@ theorem not_sshiftRight_not {x : BitVec w} {n : Nat} :
     ~~~((~~~x).sshiftRight n) = x.sshiftRight n := by
   simp [not_sshiftRight]
 
-@[simp]
-theorem shiftLeft_shiftRight {x : BitVec w} {n : Nat}:
-  x >>> n <<< n = x &&& BitVec.allOnes w <<< n := by
-  induction n generalizing x
-  case zero =>
-    ext; simp
-  case succ n ih =>
-    rw [BitVec.shiftLeft_add, Nat.add_comm, BitVec.shiftRight_add, ih,
-       Nat.add_comm, BitVec.shiftLeft_add, BitVec.shiftLeft_and_distrib]
-    ext i
-    simp only [getLsbD_and, getLsbD_shiftLeft, Fin.is_lt, decide_True, Nat.lt_one_iff,
-      Bool.true_and, getLsbD_ushiftRight, getLsbD_allOnes]
-    rw [Nat.add_comm]
-    by_cases hw : w = 0
-    · simp [hw]
-    · by_cases h : i.val = 0
-      · simp [h]
-      · rw [Nat.sub_add_cancel (by omega)]
-        simp [h]
+attribute [simp] shiftLeft_ushiftRight
 
 theorem ofInt_neg_one : BitVec.ofInt w (-1) = -1#w := by
   simp only [Int.reduceNeg, toNat_eq, toNat_ofInt, Nat.cast_pow, Nat.cast_ofNat, toNat_neg,
@@ -551,18 +533,6 @@ theorem ofInt_neg_one : BitVec.ofInt w (-1) = -1#w := by
       Int.pred_toNat]
     norm_cast
 
-@[simp]
-theorem shiftLeft_add_distrib {x y : BitVec w} {n : Nat} :
-    (x + y) <<< n = x <<< n + y <<< n := by
-  induction n
-  case zero =>
-    simp
-  case succ n ih =>
-    simp only [shiftLeft_add, ih, toNat_eq, toNat_shiftLeft, toNat_add, Nat.shiftLeft_eq_mul_pow,
-      Nat.add_mod_mod, Nat.mod_add_mod, pow_one, Nat.mod_mul_mod]
-    rw [Nat.mod_eq_of_eq]
-    omega
-
 @[simp]
 theorem shiftLeft_and_distrib' {x y : BitVec w} {n m : Nat} :
     x <<< n &&& y <<< (m + n) = (x &&& y <<< m) <<< n := by
diff --git a/lake-manifest.json b/lake-manifest.json
index 740ae69fd..c86769285 100644
--- a/lake-manifest.json
+++ b/lake-manifest.json
@@ -5,7 +5,7 @@
    "type": "git",
    "subDir": null,
    "scope": "leanprover-community",
-   "rev": "2c9497c893a4f81411023b56c51f2473c7c3c452",
+   "rev": "cfb438195e4513212997bdff25a436c1e99a3440",
    "name": "batteries",
    "manifestFile": "lake-manifest.json",
    "inputRev": "nightly-testing",
@@ -75,10 +75,10 @@
    "type": "git",
    "subDir": null,
    "scope": "",
-   "rev": "0510a8eb7a3628edd2b79c33efa04c93f377281d",
+   "rev": "c0c2c8fac501e8c0580177432e21fd461cb64580",
    "name": "mathlib",
    "manifestFile": "lake-manifest.json",
-   "inputRev": "nightly-testing-2024-09-26",
+   "inputRev": "nightly-testing-2024-09-27",
    "inherited": false,
    "configFile": "lakefile.lean"},
   {"url": "https://github.com/acmepjz/md4lean",
diff --git a/lakefile.toml b/lakefile.toml
index 05a42f08e..e637fad3f 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-2024-09-26"
+rev = "nightly-testing-2024-09-27"
 
 [[require]]
 name = "Cli"
diff --git a/lean-toolchain b/lean-toolchain
index cbe615647..594fe05fb 100644
--- a/lean-toolchain
+++ b/lean-toolchain
@@ -1 +1 @@
-leanprover/lean4:nightly-2024-09-26
+leanprover/lean4:nightly-2024-09-27