diff --git a/scdl/metadata_assembler.py b/scdl/metadata_assembler.py
index 44e5661..48b8893 100644
--- a/scdl/metadata_assembler.py
+++ b/scdl/metadata_assembler.py
@@ -38,7 +38,7 @@ class MetadataInfo:
 
 
 @singledispatch
-def assemble_metadata(file: FileType, meta: MetadataInfo) -> None:  # noqa: ARG001
+def assemble_metadata(file: FileType, meta: MetadataInfo) -> None:
     raise NotImplementedError
 
 
diff --git a/scdl/scdl.py b/scdl/scdl.py
index 0022d91..261f014 100644
--- a/scdl/scdl.py
+++ b/scdl/scdl.py
@@ -264,20 +264,13 @@ def clean_up_locks() -> None:
 class SafeLock:
     def __init__(
         self,
-        lock_file: str | os.PathLike[str],
+        lock_file: Union[str, os.PathLike[str]],
         timeout: float = -1,
         mode: int = 0o644,
         thread_local: bool = True,
-        *,
-        blocking: bool = True,
-        is_singleton: bool = False,
     ) -> None:
-        self._lock = filelock.FileLock(
-            lock_file, timeout, mode, thread_local, blocking=blocking, is_singleton=is_singleton
-        )
-        self._soft_lock = filelock.SoftFileLock(
-            lock_file, timeout, mode, thread_local, blocking=blocking, is_singleton=is_singleton
-        )
+        self._lock = filelock.FileLock(lock_file, timeout, mode, thread_local)
+        self._soft_lock = filelock.SoftFileLock(lock_file, timeout, mode, thread_local)
         self._using_soft_lock = False
 
     def __enter__(self):