diff --git a/pkgs/development/python-modules/mutmut/default.nix b/pkgs/development/tools/mutmut/default.nix
similarity index 86%
rename from pkgs/development/python-modules/mutmut/default.nix
rename to pkgs/development/tools/mutmut/default.nix
index 626c768f2a81..4b40930c646d 100644
--- a/pkgs/development/python-modules/mutmut/default.nix
+++ b/pkgs/development/tools/mutmut/default.nix
@@ -1,16 +1,9 @@
 { lib
 , fetchFromGitHub
-, buildPythonApplication
-, click
-, glob2
-, parso
-, pony
-, junit-xml
-, pythonOlder
-, testers
+, python3
 }:
 
-let self = buildPythonApplication rec {
+let self = with python3.pkgs; buildPythonApplication rec {
   pname = "mutmut";
   version = "2.2.0";
 
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 3654576eb131..abc0e423127a 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -737,6 +737,8 @@ with pkgs;
 
   owl = callPackage ../tools/networking/owl { };
 
+  mutmut = callPackage ../development/tools/mutmut { };
+
   packcc = callPackage ../development/tools/packcc { };
 
   packer = callPackage ../development/tools/packer { };
diff --git a/pkgs/top-level/python-aliases.nix b/pkgs/top-level/python-aliases.nix
index 4333585eb5e6..afaedf9a6e5d 100644
--- a/pkgs/top-level/python-aliases.nix
+++ b/pkgs/top-level/python-aliases.nix
@@ -101,6 +101,7 @@ mapAliases ({
   mailman-web = throw "Please use pkgs.mailman-web"; # added 2022-04-29
   mistune_0_8 = throw "mistune_0_8 was removed because it was outdated and insecure"; # added 2022-08-12
   mistune_2_0 = mistune; # added 2022-08-12
+  mutmut = throw "mutmut has been promoted to a top-level attribute"; # added 2022-10-02
   net2grid = gridnet; # add 2022-04-22
   nose-cover3 = throw "nose-cover3 has been removed, it was using setuptools 2to3 translation feature, which has been removed in setuptools 58"; # added 2022-02-16
   ordereddict = throw "ordereddict has been removed because it is only useful on unsupported python versions."; # added 2022-05-28
diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index c2073057e0e0..f4595081ac2c 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -5950,8 +5950,6 @@ in {
 
   mutf8 = callPackage ../development/python-modules/mutf8 { };
 
-  mutmut = callPackage ../development/python-modules/mutmut { };
-
   mujson = callPackage ../development/python-modules/mujson { };
 
   mwclient = callPackage ../development/python-modules/mwclient { };