diff --git a/pkgs/development/python-modules/pymc/default.nix b/pkgs/development/python-modules/pymc/default.nix
index 6df4be544a81..63de75a4ab1c 100644
--- a/pkgs/development/python-modules/pymc/default.nix
+++ b/pkgs/development/python-modules/pymc/default.nix
@@ -22,21 +22,16 @@
 
 buildPythonPackage rec {
   pname = "pymc";
-  version = "5.21.0";
+  version = "5.21.1";
   pyproject = true;
 
   src = fetchFromGitHub {
     owner = "pymc-devs";
     repo = "pymc";
     tag = "v${version}";
-    hash = "sha256-AHQ1x5Adhn0wQOzh9H+m0D7JpAB2XfCU0ovgkmS+Hzc=";
+    hash = "sha256-XwStIPjhCw3Vf8jAMG7x8uc/t4h1JYTDz4Lobv/nS1g=";
   };
 
-  postPatch = ''
-    substituteInPlace setup.py \
-      --replace-fail ', "pytest-cov"' ""
-  '';
-
   build-system = [
     setuptools
     versioneer