diff --git a/pkgs/development/python-modules/klein/default.nix b/pkgs/development/python-modules/klein/default.nix
index f4c26edd0e4a..a2870f3ca70d 100644
--- a/pkgs/development/python-modules/klein/default.nix
+++ b/pkgs/development/python-modules/klein/default.nix
@@ -1,35 +1,29 @@
-{ lib, buildPythonPackage, fetchPypi, fetchpatch
-, six, twisted, werkzeug, incremental
-, mock }:
+{ lib, buildPythonPackage, fetchPypi, python
+, attrs, enum34, hyperlink, incremental, six, twisted, typing, tubes, werkzeug, zope_interface
+, hypothesis, treq
+}:
 
 buildPythonPackage rec {
   pname = "klein";
-  version = "17.10.0";
+  version = "21.8.0";
 
   src = fetchPypi {
     inherit pname version;
-    sha256 = "30aaf0d78a987d5dbfe0968a07367ad0c73e02823cc8eef4c54f80ab848370d0";
+    sha256 = "1mpydmz90d0n9dwa7mr6pgj5v0kczfs05ykssrasdq368dssw7ch";
   };
 
-  patches = [
-    (fetchpatch {
-      name = "tests-expect-werkzeug-308.patch";
-      url = "https://github.com/twisted/klein/commit/e2a5835b83e37a2bc5faefbfe1890c529b18b9c6.patch";
-      sha256 = "03j0bj3l3hnf7f96rb27i4bzy1iih79ll5bcah7gybdi1wpznh8w";
-    })
-  ];
+  propagatedBuildInputs = [ attrs enum34 hyperlink incremental six twisted typing tubes werkzeug zope_interface ];
 
-  propagatedBuildInputs = [ six twisted werkzeug incremental ];
-
-  checkInputs = [ mock twisted ];
+  checkInputs = [ hypothesis treq ];
 
   checkPhase = ''
-    trial klein
+    ${python.interpreter} -m twisted.trial -j $NIX_BUILD_CORES klein
   '';
 
   meta = with lib; {
     description = "Klein Web Micro-Framework";
     homepage    = "https://github.com/twisted/klein";
     license     = licenses.mit;
+    maintainers = with maintainers; [ exarkun ];
   };
 }