diff --git a/pkgs/development/python-modules/testfixtures/default.nix b/pkgs/development/python-modules/testfixtures/default.nix
index 7da3d0de1d11..91f91a3d7b17 100644
--- a/pkgs/development/python-modules/testfixtures/default.nix
+++ b/pkgs/development/python-modules/testfixtures/default.nix
@@ -12,7 +12,7 @@
 
 buildPythonPackage rec {
   pname = "testfixtures";
-  version = "6.18.4";
+  version = "6.18.5";
   format = "setuptools";
   # DO NOT CONTACT upstream.
   # https://github.com/simplistix/ is only concerned with internal CI process.
@@ -25,7 +25,7 @@ buildPythonPackage rec {
 
   src = fetchPypi {
     inherit pname version;
-    hash = "sha256-h49hfEEXk/FVwms5MwoJWhzFiETYi83HZ6Zcf8IJa1Q=";
+    hash = "sha256-Atrog/Vn9bcP0608nu+5WRLniskL5sdES14vRr9XLIQ=";
   };
 
   checkInputs = [