diff --git a/pkgs/development/python-modules/mutmut/default.nix b/pkgs/development/python-modules/mutmut/default.nix
new file mode 100644
index 000000000000..ae0f06213a87
--- /dev/null
+++ b/pkgs/development/python-modules/mutmut/default.nix
@@ -0,0 +1,44 @@
+{ lib
+, fetchFromGitHub
+, buildPythonApplication
+, click
+, glob2
+, parso
+, pony
+, junit-xml
+, pythonOlder
+, testVersion
+}:
+
+let self = buildPythonApplication rec {
+  pname = "mutmut";
+  version = "2.2.0";
+
+  src = fetchFromGitHub {
+    repo = pname;
+    owner = "boxed";
+    rev = version;
+    hash = "sha256-G+OL/9km2iUeZ1QCpU73CIWVWMexcs3r9RdCnAsESnY=";
+  };
+
+  postPatch = ''
+    substituteInPlace requirements.txt --replace 'junit-xml==1.8' 'junit-xml==1.9'
+  '';
+
+  disabled = pythonOlder "3.7";
+
+  doCheck = false;
+
+  propagatedBuildInputs = [ click glob2 parso pony junit-xml ];
+
+  passthru.tests.version = testVersion { package = self; };
+
+  meta = with lib; {
+    description = "mutation testing system for Python, with a strong focus on ease of use";
+    homepage = "https://github.com/boxed/mutmut";
+    changelog = "https://github.com/boxed/mutmut/blob/${version}/HISTORY.rst";
+    license = licenses.bsd3;
+    maintainers = with maintainers; [ synthetica ];
+  };
+};
+in self
diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index 34507b7a5bef..17d62c17c53e 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -5195,6 +5195,8 @@ 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 { };