diff --git a/pkgs/development/python-modules/ws4py/default.nix b/pkgs/development/python-modules/ws4py/default.nix
index 648ab1cff083..5e65940e8468 100644
--- a/pkgs/development/python-modules/ws4py/default.nix
+++ b/pkgs/development/python-modules/ws4py/default.nix
@@ -4,11 +4,11 @@
 buildPythonPackage rec {
   name = "${pname}-${version}";
   pname = "ws4py";
-  version = "0.4.2";
+  version = "0.4.3";
 
   src = fetchPypi {
     inherit pname version;
-    sha256 = "0zr3254ky6r7q15l3dhdczfa8i723055zdkqssjifsgcwvirriks";
+    sha256 = "ee12b58384bab8bfdcd1c76dcd6852047aec163af17175fc0f73e255d107dd7a";
   };
 
   checkInputs = [ pytest mock git ];