diff --git a/pkgs/development/python-modules/monty/default.nix b/pkgs/development/python-modules/monty/default.nix
index 9f275a99c748..36d798e5504d 100644
--- a/pkgs/development/python-modules/monty/default.nix
+++ b/pkgs/development/python-modules/monty/default.nix
@@ -14,14 +14,14 @@
 
 buildPythonPackage rec {
   pname = "monty";
-  version = "2021.8.17";
+  version = "2021.12.1";
   disabled = pythonOlder "3.5"; # uses type annotations
 
   src = fetchFromGitHub {
     owner = "materialsvirtuallab";
     repo = pname;
     rev = "v${version}";
-    sha256 = "0lg6d0qk6iv476rcn45p5f50kips5g9s709cxddwnk5yrz57c4d0";
+    sha256 = "0zcbdh7pqv4dq3fan0zh912w9bvmf2p0zj1fhp0ayhdsc50cwldh";
   };
 
   postPatch = ''