diff --git a/pkgs/development/python-modules/pytest-cases/default.nix b/pkgs/development/python-modules/pytest-cases/default.nix
index d74ffcb45d2a..f6fac10aaadf 100644
--- a/pkgs/development/python-modules/pytest-cases/default.nix
+++ b/pkgs/development/python-modules/pytest-cases/default.nix
@@ -4,6 +4,7 @@
   fetchPypi,
   makefun,
   decopatch,
+  packaging,
   pythonOlder,
   pytest,
   setuptools-scm,
@@ -11,24 +12,24 @@
 
 buildPythonPackage rec {
   pname = "pytest-cases";
-  version = "3.8.6";
+  version = "3.9.1";
   pyproject = true;
 
-  disabled = pythonOlder "3.6";
+  disabled = pythonOlder "3.9";
 
   src = fetchPypi {
     pname = "pytest_cases";
     inherit version;
-    hash = "sha256-XCTgqwy2+OgCpGm3llkGozPTuruHRYbrxW9+LL4afEQ=";
+    hash = "sha256-xOGB8bUlyTGjGNSBL6jeZWwsj7d/zPFXHs8Mxf6Of48=";
   };
 
   build-system = [ setuptools-scm ];
 
-  buildInputs = [ pytest ];
-
   dependencies = [
     decopatch
     makefun
+    packaging
+    pytest
   ];
 
   # Tests have dependencies (pytest-harvest, pytest-steps) which