diff --git a/pkgs/development/python-modules/stestr/default.nix b/pkgs/development/python-modules/stestr/default.nix
index 2071d20a75f8..bb6dc7e54b20 100644
--- a/pkgs/development/python-modules/stestr/default.nix
+++ b/pkgs/development/python-modules/stestr/default.nix
@@ -13,11 +13,11 @@
 
 buildPythonPackage rec {
   pname = "stestr";
-  version = "3.2.1";
+  version = "4.0.0";
 
   src = fetchPypi {
     inherit pname version;
-    sha256 = "sha256-wj7nq0QSKNiDZZBKIk+4RC2gwCifkBz0qUIukpt76c0=";
+    sha256 = "sha256-A2Y+q62KcxaoRJFo78WCVmpdOvnHf8QALX3IPnf28q0=";
   };
 
   postPatch = ''