diff --git a/pkgs/development/python-modules/traits/default.nix b/pkgs/development/python-modules/traits/default.nix
index 36aa31086929..eeb04ba23477 100644
--- a/pkgs/development/python-modules/traits/default.nix
+++ b/pkgs/development/python-modules/traits/default.nix
@@ -8,14 +8,14 @@
 
 buildPythonPackage rec {
   pname = "traits";
-  version = "6.4.1";
+  version = "6.4.2";
   format = "setuptools";
 
   disabled = pythonOlder "3.6";
 
   src = fetchPypi {
     inherit pname version;
-    hash = "sha256-eLssyv1gr/YGUVqsRt5kZooKgctcVMZQuYd6hBqp6BI=";
+    hash = "sha256-W+fMX7epnLp+kBR4Y3PjrS9177RF7s7QlGVLuvOw+oI=";
   };
 
   # Circular dependency