diff --git a/pkgs/development/python-modules/decorator/default.nix b/pkgs/development/python-modules/decorator/default.nix
index e3ee3117501b..e852ac0385ca 100644
--- a/pkgs/development/python-modules/decorator/default.nix
+++ b/pkgs/development/python-modules/decorator/default.nix
@@ -5,11 +5,11 @@
 
 buildPythonPackage rec {
   pname = "decorator";
-  version = "4.1.2";
+  version = "4.2.1";
 
   src = fetchPypi {
     inherit pname version;
-    sha256 = "7cb64d38cb8002971710c8899fbdfb859a23a364b7c99dab19d1f719c2ba16b5";
+    sha256 = "7d46dd9f3ea1cf5f06ee0e4e1277ae618cf48dfb10ada7c8427cd46c42702a0e";
   };
 
   meta = {