diff --git a/pkgs/development/python-modules/dulwich/default.nix b/pkgs/development/python-modules/dulwich/default.nix
index b87e8d3c974a..0ab5b5c3d9c7 100644
--- a/pkgs/development/python-modules/dulwich/default.nix
+++ b/pkgs/development/python-modules/dulwich/default.nix
@@ -25,19 +25,19 @@
 
 buildPythonPackage (finalAttrs: {
   pname = "dulwich";
-  version = "1.2.0";
+  version = "1.2.1";
   pyproject = true;
 
   src = fetchFromGitHub {
     owner = "jelmer";
     repo = "dulwich";
     tag = "dulwich-${finalAttrs.version}";
-    hash = "sha256-R5vq3mb1nSqEn+LIUaXc8Edrw8TgTb5H4LOXnHgeAzQ=";
+    hash = "sha256-pyBAN1zSYGrOg4tic/SiKROHHUlFMtBSF0OOVNVvkyM=";
   };
 
   cargoDeps = rustPlatform.fetchCargoVendor {
     inherit (finalAttrs) pname version src;
-    hash = "sha256-r2Ef8ciZW6rNBg8eLr5lkqtTEXugy7B9DjbSCErJkzc=";
+    hash = "sha256-U5X/D3iVg2qunji8HQbNeDzvYMoD4oRe5bL6l035lO0=";
   };
 
   nativeBuildInputs = [