diff --git a/pkgs/development/python-modules/msgpack/default.nix b/pkgs/development/python-modules/msgpack/default.nix
index a1c3b14b6303..3f519e329565 100644
--- a/pkgs/development/python-modules/msgpack/default.nix
+++ b/pkgs/development/python-modules/msgpack/default.nix
@@ -10,14 +10,14 @@
 
 buildPythonPackage rec {
   pname = "msgpack";
-  version = "1.1.2";
+  version = "1.2.1";
   pyproject = true;
 
   src = fetchFromGitHub {
     owner = "msgpack";
     repo = "msgpack-python";
     tag = "v${version}";
-    hash = "sha256-9iFTQPAM6AAogcRUoCw5/bECNiGUwmAarEiwMJ+rqbk=";
+    hash = "sha256-L8nU+n0M3NJvQzjRlWESXvzP6CxR5CTSu7UkeGfHHUs=";
   };
 
   build-system = [ setuptools ];