diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index aa401e67972e..45631159231d 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -17850,11 +17850,11 @@ in {
 
   traits = buildPythonPackage rec {
     name = "traits-${version}";
-    version = "4.5.0";
+    version = "4.6.0";
 
     src = pkgs.fetchurl {
       url = "mirror://pypi/t/traits/${name}.tar.gz";
-      sha256 = "5293a8786030b0b243e059f52004355b6939d7c0f1be2eb5a605b63cca484c84";
+      sha256 = "0w43qv36wnrimlh0nzzgg81315a18yza3vk494wqxf1l19g390jx";
     };
 
     # Use pytest because its easier to discover tests
@@ -17867,7 +17867,7 @@ in {
     # https://github.com/enthought/traits/issues/187
     # https://github.com/enthought/traits/pull/188
     # Furthermore, some tests fail due to being in a chroot
-    doCheck = false;
+    doCheck = isPy33;
 
     propagatedBuildInputs = with self; [ numpy ];