diff --git a/pkgs/development/python-modules/openshift/default.nix b/pkgs/development/python-modules/openshift/default.nix
index f1ea8488995b..4afdab81fee8 100644
--- a/pkgs/development/python-modules/openshift/default.nix
+++ b/pkgs/development/python-modules/openshift/default.nix
@@ -8,6 +8,7 @@
   six,
   python-string-utils,
   pytest-bdd,
+  pytest-cov-stub,
   pytestCheckHook,
 }:
 
@@ -23,12 +24,7 @@ buildPythonPackage rec {
     hash = "sha256-uLfewj7M8KNs3oL1AM18sR/WhAR2mvBfqadyhR73FP0=";
   };
 
-  postPatch = ''
-    substituteInPlace requirements.txt \
-      --replace "kubernetes ~= 12.0" "kubernetes"
-
-    sed -i '/--cov/d' setup.cfg
-  '';
+  pythonRelaxDeps = [ "kubernetes" ];
 
   propagatedBuildInputs = [
     jinja2
@@ -42,6 +38,7 @@ buildPythonPackage rec {
 
   nativeCheckInputs = [
     pytest-bdd
+    pytest-cov-stub
     pytestCheckHook
   ];