diff --git a/pkgs/development/python-modules/nbdev/default.nix b/pkgs/development/python-modules/nbdev/default.nix
index 389f0977677d..4178f611e43d 100644
--- a/pkgs/development/python-modules/nbdev/default.nix
+++ b/pkgs/development/python-modules/nbdev/default.nix
@@ -15,14 +15,14 @@
 
 buildPythonPackage rec {
   pname = "nbdev";
-  version = "2.3.20";
+  version = "2.3.21";
   pyproject = true;
 
   disabled = pythonOlder "3.7";
 
   src = fetchPypi {
     inherit pname version;
-    hash = "sha256-tBrWdG8njNQzQ3kc0ATeu3ToP34gdmOBKj2jcB0X8+8=";
+    hash = "sha256-H3KHnVOdy+Hdpka+dxp/qPj1HZSXIbXJshnZuXVo9DQ=";
   };
 
   nativeBuildInputs = [