diff --git a/pkgs/development/python-modules/testtools/default.nix b/pkgs/development/python-modules/testtools/default.nix
index 8264314c96a6..8ef3d9c4320f 100644
--- a/pkgs/development/python-modules/testtools/default.nix
+++ b/pkgs/development/python-modules/testtools/default.nix
@@ -11,11 +11,11 @@
 
 buildPythonPackage rec {
   pname = "testtools";
-  version = "2.3.0";
+  version = "2.4.0";
 
   src = fetchPypi {
     inherit pname version;
-    sha256 = "5827ec6cf8233e0f29f51025addd713ca010061204fdea77484a2934690a0559";
+    sha256 = "64c974a6cca4385d05f4bbfa2deca1c39ce88ede31c3448bee86a7259a9a61c8";
   };
 
   propagatedBuildInputs = [ pbr python_mimeparse extras unittest2 ];