diff --git a/pkgs/development/python-modules/semver/default.nix b/pkgs/development/python-modules/semver/default.nix
index f92362ff8afbd..4072268609d2a 100644
--- a/pkgs/development/python-modules/semver/default.nix
+++ b/pkgs/development/python-modules/semver/default.nix
@@ -2,17 +2,19 @@
 
 buildPythonPackage rec {
   pname = "semver";
-  version = "2.7.9";
+  version = "2.8.1";
 
   src = fetchFromGitHub {
     owner = "k-bx";
     repo = "python-semver";
-    rev = "2001c62d1a0361c44acc7076d8ce91e1d1c66141"; # not tagged in repository
-    sha256 = "01c05sv97dyr672sa0nr3fnh2aqbmvkfw19d6rkaj16h2sdsyg0i";
+    rev = "41775dd5f143dfa6ca94885056c9ef5b3ed4e6e1"; # not tagged in repository
+    sha256 = "1rqaakha4sw06k9h0h4g1wmk66zkmhpq92y2rw0kyfpp6xk1zbk2";
   };
 
   checkInputs = [ pytest ];
-  checkPhase = "pytest -v tests.py";
+  checkPhase = ''
+    py.test
+  '';
 
   meta = with stdenv.lib; {
     description = "Python package to work with Semantic Versioning (http://semver.org/)";