diff --git a/pkgs/development/python-modules/mammoth/default.nix b/pkgs/development/python-modules/mammoth/default.nix
index b0f28ff68a1e..ae8023b0c55e 100644
--- a/pkgs/development/python-modules/mammoth/default.nix
+++ b/pkgs/development/python-modules/mammoth/default.nix
@@ -13,14 +13,14 @@
 
 buildPythonPackage rec {
   pname = "mammoth";
-  version = "1.11.0";
+  version = "1.12.0";
   pyproject = true;
 
   src = fetchFromGitHub {
     owner = "mwilliamson";
     repo = "python-mammoth";
     tag = version;
-    hash = "sha256-x1wSudTD/C1uHnudaCCrhi9fyQInCej+Kd7CyBI2sus=";
+    hash = "sha256-8aqO5JPiyONu5rfR76qrutPHGE4nJn+716uPtYlZ+xA=";
   };
 
   postPatch = ''