diff --git a/pkgs/development/python-modules/gunicorn/default.nix b/pkgs/development/python-modules/gunicorn/default.nix
index 8c543bce8571..62b5c6de668f 100644
--- a/pkgs/development/python-modules/gunicorn/default.nix
+++ b/pkgs/development/python-modules/gunicorn/default.nix
@@ -1,7 +1,6 @@
 { lib
 , buildPythonPackage
 , fetchFromGitHub
-, fetchpatch
 , pythonOlder
 , eventlet
 , gevent
@@ -11,24 +10,17 @@
 
 buildPythonPackage rec {
   pname = "gunicorn";
-  version = "20.1.0";
+  version = "21.1.0";
+  format = "setuptools";
   disabled = pythonOlder "3.5";
 
   src = fetchFromGitHub {
     owner = "benoitc";
     repo = "gunicorn";
     rev = version;
-    hash = "sha256-xdNHm8NQWlAlflxof4cz37EoM74xbWrNaf6jlwwzHv4=";
+    hash = "sha256-4NrpGpg1kJy54KT3Ao24ZtcCasYjLtkMbHDdBDYbR44=";
   };
 
-  patches = [
-    (fetchpatch {
-      # fix eventlet 0.30.3+ compability
-      url = "https://github.com/benoitc/gunicorn/commit/6a8ebb4844b2f28596ffe7421eb9f7d08c8dc4d8.patch";
-      hash = "sha256-+iApgohzPZ/cHTGBNb7XkqLaHOVVPF26BnPUsvISoZw=";
-    })
-  ];
-
   postPatch = ''
     substituteInPlace setup.cfg \
       --replace "--cov=gunicorn --cov-report=xml" ""