diff --git a/NightLight.Core.Tests/MutationCaseAttribute.fs b/NightLight.Core.Tests/MutationCaseAttribute.fs
deleted file mode 100644
index 12e6475..0000000
--- a/NightLight.Core.Tests/MutationCaseAttribute.fs
+++ /dev/null
@@ -1,13 +0,0 @@
-namespace Mutannot
-
-open System
-
-[<AttributeUsage(AttributeTargets.Method, AllowMultiple = true)>]
-type MutationCaseAttribute(id: string, file: string, line: int, find: string, replace: string) =
-    inherit Attribute()
-
-    member _.Id = id
-    member _.File = file
-    member _.Line = line
-    member _.Find = find
-    member _.Replace = replace
diff --git a/NightLight.Core.Tests/NightLight.Core.Tests.fsproj b/NightLight.Core.Tests/NightLight.Core.Tests.fsproj
index 4364d43..8c14702 100644
--- a/NightLight.Core.Tests/NightLight.Core.Tests.fsproj
+++ b/NightLight.Core.Tests/NightLight.Core.Tests.fsproj
@@ -7,7 +7,6 @@
     </PropertyGroup>
 
     <ItemGroup>
-        <Compile Include="MutationCaseAttribute.fs" />
         <Compile Include="FakeHome.fs" />
         <Compile Include="GenHelpers.fs" />
         <Compile Include="InteractionListHelpers.fs" />
diff --git a/NightLight.Core.Tests/NightLightTests.fs b/NightLight.Core.Tests/NightLightTests.fs
index a66d65e..7ad546b 100644
--- a/NightLight.Core.Tests/NightLightTests.fs
+++ b/NightLight.Core.Tests/NightLightTests.fs
@@ -1,6 +1,5 @@
 namespace NightLight.Core.Tests
 
-open Mutannot
 open NightLight.Core.Core
 open NightLight.Core.Tests.InteractionListGenerators
 open NightLight.Core.Tests.InteractionListHelpers
@@ -32,7 +31,6 @@ type NightLightTests() =
         fakeHome
 
     [<Property(Arbitrary = [| typeof<ArbitraryInteractions> |])>]
-    [<MutationCase("all-lights-right-color-night-is-yellow", "NightLight.Core/Moods.fs", 16, "Red", "Yellow")>]
     let ``All lights should either be off or have the right color`` (interactions: Interaction list) =
         let fakeHome = createFakeHomeWithNightLightAndInteract interactions
         let partOfDay = getPartOfDayAfterInteractions interactions
@@ -50,7 +48,6 @@ type NightLightTests() =
         |> Prop.trivial (fakeHome.LightsThatAreOn.Length = 0)
 
     [<Property(Arbitrary = [| typeof<ArbitraryInteractions> |], MaxTest = 500)>]
-    [<MutationCase("brightness-command-off-by-one", "NightLight.Core/ZigbeeCommands.fs", 40, "Brightness b -> b", "Brightness b -> b + 1")>]
     let ``All lights should either be off or have a brightness that fits its color`` (interactions: Interaction list) =
         let fakeHome = createFakeHomeWithNightLightAndInteract interactions
         let time = getTimeAfterInteractions interactions |> _.TimeOfDay
@@ -91,7 +88,6 @@ type NightLightTests() =
         |> Prop.trivial (fakeHome.LightsThatAreOn.Length = 0)
 
     [<Property(Arbitrary = [| typeof<ArbitraryInteractions> |], MaxTest = 500)>]
-    [<MutationCase("lights-default-to-off", "NightLight.Core/NightLightStateMachine.fs", 145, "light, On", "light, Off")>]
     let ``All lights with power should have the correct state`` (interactions: Interaction list) =
         let fakeHome = createFakeHomeWithNightLightAndInteract interactions
 
diff --git a/flake.lock b/flake.lock
index 52a4b9b..181aa01 100644
--- a/flake.lock
+++ b/flake.lock
@@ -42,27 +42,6 @@
         "url": "https://codeberg.org/svenvanheugten/git-check-assertions.git"
       }
     },
-    "mutannot": {
-      "inputs": {
-        "nixpkgs": [
-          "nixpkgs"
-        ]
-      },
-      "locked": {
-        "lastModified": 1777439386,
-        "narHash": "sha256-nTBcu7NsN1jwoXr8SoKaW+0EPb5klTU6SSWuXOeuEuA=",
-        "ref": "main",
-        "rev": "1019d3c5d04d441d12b915876110f7493270b988",
-        "revCount": 19,
-        "type": "git",
-        "url": "https://git.memcmp.org/svenvanheugten/mutannot.git"
-      },
-      "original": {
-        "ref": "main",
-        "type": "git",
-        "url": "https://git.memcmp.org/svenvanheugten/mutannot.git"
-      }
-    },
     "nixpkgs": {
       "locked": {
         "lastModified": 1773507054,
@@ -83,7 +62,6 @@
       "inputs": {
         "flake-utils": "flake-utils",
         "git-check-assertions": "git-check-assertions",
-        "mutannot": "mutannot",
         "nixpkgs": "nixpkgs"
       }
     },
diff --git a/flake.nix b/flake.nix
index 074d9ba..5447ef1 100644
--- a/flake.nix
+++ b/flake.nix
@@ -7,10 +7,6 @@
       inputs.nixpkgs.follows = "nixpkgs";
       inputs.flake-utils.follows = "flake-utils";
     };
-    mutannot = {
-      url = "git+https://git.memcmp.org/svenvanheugten/mutannot.git?ref=main";
-      inputs.nixpkgs.follows = "nixpkgs";
-    };
   };
   outputs =
     {
@@ -18,7 +14,6 @@
       nixpkgs,
       flake-utils,
       git-check-assertions,
-      mutannot,
     }:
     flake-utils.lib.eachDefaultSystem (
       system:
@@ -31,7 +26,6 @@
           packages = [
             pkgs.dotnet-sdk_10
             git-check-assertions.packages.${system}.default
-            mutannot.packages.${system}.default
           ];
         };
       }