diff --git a/pkgs/development/python-modules/biliass/default.nix b/pkgs/development/python-modules/biliass/default.nix
index a3a34d2ca910..21054b2c5b1e 100644
--- a/pkgs/development/python-modules/biliass/default.nix
+++ b/pkgs/development/python-modules/biliass/default.nix
@@ -10,14 +10,14 @@
 
 buildPythonPackage rec {
   pname = "biliass";
-  version = "2.3.1";
+  version = "2.1.1";
   pyproject = true;
 
   src = fetchFromGitHub {
     owner = "yutto-dev";
     repo = "yutto";
     tag = "biliass@${version}";
-    hash = "sha256-ZB18BQJRSwA/ERHjqmp+D39UqTvdYpbhwLjaizM5R2I=";
+    hash = "sha256-Pn6z4iDxNcLVoY4xk7v0zc8hmajWEaOYFDEw5HEYxl4=";
   };
 
   sourceRoot = "${src.name}/packages/biliass";
@@ -31,7 +31,7 @@ buildPythonPackage rec {
       sourceRoot
       cargoRoot
       ;
-    hash = "sha256-gOYgYi8RlWBe0astv6D6/J7Ge20TM/19zJHwoCevpIo=";
+    hash = "sha256-0/3r4P6SJq4zbZpKW9bn+ljRbYkxWFP8nYxjlMLXioI=";
   };
 
   nativeBuildInputs = with rustPlatform; [