diff --git a/pkgs/development/python-modules/pdm-backend/default.nix b/pkgs/development/python-modules/pdm-backend/default.nix
index 19ba24ef6991..eb1d1f3df3a1 100644
--- a/pkgs/development/python-modules/pdm-backend/default.nix
+++ b/pkgs/development/python-modules/pdm-backend/default.nix
@@ -15,14 +15,14 @@
 
 buildPythonPackage rec {
   pname = "pdm-backend";
-  version = "2.1.0";
+  version = "2.1.1";
   format = "pyproject";
 
   src = fetchFromGitHub {
     owner = "pdm-project";
     repo = "pdm-backend";
     rev = "refs/tags/${version}";
-    hash = "sha256-asW5L9jS++9ovq7WFh0rU7aB7R2rwi5ce80Hxk9NrI4=";
+    hash = "sha256-g8VL5nO180XplMgbbeeJIp6lmbWcMKdY/IftlkL6e5U=";
   };
 
   env.PDM_BUILD_SCM_VERSION = version;