diff --git a/pkgs/development/python-modules/notebook/default.nix b/pkgs/development/python-modules/notebook/default.nix
index 435b4f13765f..3276c8ec51c9 100644
--- a/pkgs/development/python-modules/notebook/default.nix
+++ b/pkgs/development/python-modules/notebook/default.nix
@@ -27,12 +27,12 @@
 
 buildPythonPackage rec {
   pname = "notebook";
-  version = "6.4.0";
+  version = "6.4.3";
   disabled = !isPy3k;
 
   src = fetchPypi {
     inherit pname version;
-    sha256 = "9c4625e2a2aa49d6eae4ce20cbc3d8976db19267e32d2a304880e0c10bf8aef9";
+    sha256 = "03awxl8hr7ibwr6n48gci8jx80f18zll439wyr8gj35h6vnxzdp6";
   };
 
   LC_ALL = "en_US.utf8";