diff --git a/pkgs/development/python-modules/gunicorn/default.nix b/pkgs/development/python-modules/gunicorn/default.nix
index 25296b64d9ba..909fff5b5aaa 100644
--- a/pkgs/development/python-modules/gunicorn/default.nix
+++ b/pkgs/development/python-modules/gunicorn/default.nix
@@ -17,27 +17,23 @@
   setproctitle,
 
   pytestCheckHook,
+  pytest-cov,
 }:
 
 buildPythonPackage rec {
   pname = "gunicorn";
-  version = "21.2.0";
+  version = "22.0.0";
   pyproject = true;
 
-  disabled = pythonOlder "3.5";
+  disabled = pythonOlder "3.6";
 
   src = fetchFromGitHub {
     owner = "benoitc";
     repo = "gunicorn";
-    rev = version;
-    hash = "sha256-xP7NNKtz3KNrhcAc00ovLZRx2h6ZqHbwiFOpCiuwf98=";
+    rev = "refs/tags/${version}";
+    hash = "sha256-xIXQMAdTZEBORu6789tLpT1OpBL+aveL/MfDj4f4bes=";
   };
 
-  postPatch = ''
-    substituteInPlace setup.cfg \
-      --replace "--cov=gunicorn --cov-report=xml" ""
-  '';
-
   build-system = [ setuptools ];
 
   dependencies = [ packaging ];
@@ -52,7 +48,10 @@ buildPythonPackage rec {
 
   pythonImportsCheck = [ "gunicorn" ];
 
-  nativeCheckInputs = [ pytestCheckHook ] ++ lib.flatten (lib.attrValues optional-dependencies);
+  nativeCheckInputs = [
+    pytestCheckHook
+    pytest-cov
+  ] ++ lib.flatten (lib.attrValues optional-dependencies);
 
   meta = {
     description = "gunicorn 'Green Unicorn' is a WSGI HTTP Server for UNIX, fast clients and sleepy applications";