diff --git a/pkgs/development/python-modules/widgetsnbextension/default.nix b/pkgs/development/python-modules/widgetsnbextension/default.nix
index db992c7b932c..ab2bd9c4eb18 100644
--- a/pkgs/development/python-modules/widgetsnbextension/default.nix
+++ b/pkgs/development/python-modules/widgetsnbextension/default.nix
@@ -7,11 +7,11 @@
 
 buildPythonPackage rec {
   pname = "widgetsnbextension";
-  version = "3.4.0";
+  version = "3.4.2";
 
   src = fetchPypi {
     inherit pname version;
-    sha256 = "c9d6e426a1d79d132b57b93b368feba2c66eb7b0fd34bdb901716b4b88e94497";
+    sha256 = "fa618be8435447a017fd1bf2c7ae922d0428056cfc7449f7a8641edf76b48265";
   };
 
   propagatedBuildInputs = [ notebook ];