diff --git a/SphereEversion/ToMathlib/Analysis/ContDiff.lean b/SphereEversion/ToMathlib/Analysis/ContDiff.lean
index 0354b695..91d1bd43 100644
--- a/SphereEversion/ToMathlib/Analysis/ContDiff.lean
+++ b/SphereEversion/ToMathlib/Analysis/ContDiff.lean
@@ -79,16 +79,6 @@ theorem StrictDifferentiableAt.differentiableAt {f : E → F} {x : E}
     (h : StrictDifferentiableAt 𝕜 f x) : DifferentiableAt 𝕜 f x :=
   Exists.elim h fun φ hφ ↦ ⟨φ, hφ.hasFDerivAt⟩
 
--- PR to Topology.Algebra.Module.Basic
-@[simp]
-theorem ContinuousLinearMap.coprod_comp_inl_inr {R₁ : Type*} [Semiring R₁] {M₁ : Type*}
-    [TopologicalSpace M₁] [AddCommMonoid M₁] {M₂ : Type*} [TopologicalSpace M₂] [AddCommMonoid M₂]
-    {M₃ : Type*} [TopologicalSpace M₃] [AddCommMonoid M₃] [Module R₁ M₁] [Module R₁ M₂]
-    [Module R₁ M₃] [ContinuousAdd M₃] (f : M₁ × M₂ →L[R₁] M₃) :
-    (f.comp (ContinuousLinearMap.inl R₁ M₁ M₂)).coprod (f.comp (ContinuousLinearMap.inr R₁ M₁ M₂)) =
-      f :=
-  ContinuousLinearMap.coe_injective (f : M₁ × M₂ →ₗ[R₁] M₃).coprod_comp_inl_inr
-
 theorem DifferentiableAt.hasFDerivAt_coprod_partial {f : E → F → G} {x : E} {y : F}
     (hf : DifferentiableAt 𝕜 (uncurry f) (x, y)) :
     HasFDerivAt (uncurry f)
diff --git a/lake-manifest.json b/lake-manifest.json
index 02b51660..ba7dfe89 100644
--- a/lake-manifest.json
+++ b/lake-manifest.json
@@ -15,7 +15,7 @@
    "type": "git",
    "subDir": null,
    "scope": "leanprover-community",
-   "rev": "a3a10db0e9d66acbebf76c5e6a135066525ac900",
+   "rev": "8f9d9cff6bd728b17a24e163c9402775d9e6a365",
    "name": "mathlib",
    "manifestFile": "lake-manifest.json",
    "inputRev": "master",
@@ -25,7 +25,7 @@
    "type": "git",
    "subDir": null,
    "scope": "leanprover-community",
-   "rev": "009dc1e6f2feb2c96c081537d80a0905b2c6498f",
+   "rev": "55c8532eb21ec9f6d565d51d96b8ca50bd1fbef3",
    "name": "plausible",
    "manifestFile": "lake-manifest.json",
    "inputRev": "main",
@@ -35,7 +35,7 @@
    "type": "git",
    "subDir": null,
    "scope": "leanprover-community",
-   "rev": "5ce7f0a355f522a952a3d678d696bd563bb4fd28",
+   "rev": "c5d5b8fe6e5158def25cd28eb94e4141ad97c843",
    "name": "LeanSearchClient",
    "manifestFile": "lake-manifest.json",
    "inputRev": "main",
@@ -45,7 +45,7 @@
    "type": "git",
    "subDir": null,
    "scope": "leanprover-community",
-   "rev": "8f497d55985a189cea8020d9dc51260af1e41ad2",
+   "rev": "85b59af46828c029a9168f2f9c35119bd0721e6e",
    "name": "importGraph",
    "manifestFile": "lake-manifest.json",
    "inputRev": "main",
@@ -55,17 +55,17 @@
    "type": "git",
    "subDir": null,
    "scope": "leanprover-community",
-   "rev": "c04225ee7c0585effbd933662b3151f01b600e40",
+   "rev": "be3b2e63b1bbf496c478cef98b86972a37c1417d",
    "name": "proofwidgets",
    "manifestFile": "lake-manifest.json",
-   "inputRev": "v0.0.85",
+   "inputRev": "v0.0.87",
    "inherited": true,
    "configFile": "lakefile.lean"},
   {"url": "https://github.com/leanprover-community/aesop",
    "type": "git",
    "subDir": null,
    "scope": "leanprover-community",
-   "rev": "cb837cc26236ada03c81837bebe0acd9c70ced7d",
+   "rev": "f642a64c76df8ba9cb53dba3b919425a0c2aeaf1",
    "name": "aesop",
    "manifestFile": "lake-manifest.json",
    "inputRev": "master",
@@ -75,7 +75,7 @@
    "type": "git",
    "subDir": null,
    "scope": "leanprover-community",
-   "rev": "bd58c9efe2086d56ca361807014141a860ddbf8c",
+   "rev": "b8f98e9087e02c8553945a2c5abf07cec8e798c3",
    "name": "Qq",
    "manifestFile": "lake-manifest.json",
    "inputRev": "master",
@@ -85,7 +85,7 @@
    "type": "git",
    "subDir": null,
    "scope": "leanprover-community",
-   "rev": "b25b36a7caf8e237e7d1e6121543078a06777c8a",
+   "rev": "495c008c3e3f4fb4256ff5582ddb3abf3198026f",
    "name": "batteries",
    "manifestFile": "lake-manifest.json",
    "inputRev": "main",
@@ -95,10 +95,10 @@
    "type": "git",
    "subDir": null,
    "scope": "leanprover",
-   "rev": "55c37290ff6186e2e965d68cf853a57c0702db82",
+   "rev": "4f10f47646cb7d5748d6f423f4a07f98f7bbcc9e",
    "name": "Cli",
    "manifestFile": "lake-manifest.json",
-   "inputRev": "v4.27.0",
+   "inputRev": "v4.28.0",
    "inherited": true,
    "configFile": "lakefile.toml"}],
  "name": "SphereEversion",
diff --git a/lean-toolchain b/lean-toolchain
index 2bb276aa..ea6ca7ff 100644
--- a/lean-toolchain
+++ b/lean-toolchain
@@ -1 +1 @@
-leanprover/lean4:v4.27.0
\ No newline at end of file
+leanprover/lean4:v4.28.0
\ No newline at end of file