diff --git a/pkgs/development/python-modules/testtools/default.nix b/pkgs/development/python-modules/testtools/default.nix
index e1c2cfc6e0bf..0ea71bcbe6af 100644
--- a/pkgs/development/python-modules/testtools/default.nix
+++ b/pkgs/development/python-modules/testtools/default.nix
@@ -14,12 +14,12 @@
 
 buildPythonPackage rec {
   pname = "testtools";
-  version = "2.7.2";
+  version = "2.9.1";
   pyproject = true;
 
   src = fetchPypi {
     inherit pname version;
-    hash = "sha256-W+W7wfD6D4tgrKbO7AeEXUHQxHXPRFv6200sRew5fqM=";
+    hash = "sha256-Oa2eueG5NdaDj0s67k1ucttl31YC9v7amY27T+jeCxk=";
   };
 
   nativeBuildInputs = [