diff --git a/src/container_drift.py b/src/container_drift.py
index 5fb1552..76160db 100644
--- a/src/container_drift.py
+++ b/src/container_drift.py
@@ -48,11 +48,11 @@
 @celery.task(bind=True, name=TASK_NAME, metadata=TASK_METADATA)
 def container_drift(
     self,
-    pipe_result: str = "",
-    input_files: list[dict] = [],
-    output_path: str = "",
-    workflow_id: str = "",
-    task_config: dict[str, Any] = {},
+    pipe_result: str = None,
+    input_files: list[dict] = None,
+    output_path: str = None,
+    workflow_id: str = None,
+    task_config: dict[str, Any] = None,
 ) -> str:
     """Checks for drifts in containers.
 
diff --git a/src/container_export.py b/src/container_export.py
index f04ce6e..1cb985d 100644
--- a/src/container_export.py
+++ b/src/container_export.py
@@ -323,11 +323,11 @@ def export_all_containers(
 @celery.task(bind=True, name=TASK_NAME, metadata=TASK_METADATA)
 def container_export(
     self,
-    pipe_result: str = "",
-    input_files: list[Any] = [],
-    output_path: str = "",
-    workflow_id: str = "",
-    task_config: dict[str, Any] = {},
+    pipe_result: str = None,
+    input_files: list[dict] = None,
+    output_path: str = None,
+    workflow_id: str = None,
+    task_config: dict[str, Any] = None,
 ) -> str:
     """Export containers as disk image, archive, or both.
 
diff --git a/src/container_file_extract.py b/src/container_file_extract.py
index f0b6208..dede542 100644
--- a/src/container_file_extract.py
+++ b/src/container_file_extract.py
@@ -83,11 +83,11 @@ def on_task_prerun(sender, task_id, task, args, kwargs, **_):
 @celery.task(bind=True, name=TASK_NAME, metadata=TASK_METADATA)
 def container_file_extraction(
     self,
-    pipe_result: str = "",
-    input_files: list[dict[str, Any]] = [],
-    output_path: str = "",
-    workflow_id: str = "",
-    task_config: dict[str, Any] = {},
+    pipe_result: str = None,
+    input_files: list[dict] = None,
+    output_path: str = None,
+    workflow_id: str = None,
+    task_config: dict[str, Any] = None,
 ) -> str:
     """Checks for drifts in containers.
 
diff --git a/src/container_list.py b/src/container_list.py
index f1a1595..39c402d 100644
--- a/src/container_list.py
+++ b/src/container_list.py
@@ -63,11 +63,11 @@ def on_task_prerun(sender, task_id, task, args, kwargs, **_):
 @celery.task(bind=True, name=TASK_NAME, metadata=TASK_METADATA)
 def container_list(
     self,
-    pipe_result: str = "",
-    input_files: list[dict] = [],
-    output_path: str = "",
-    workflow_id: str = "",
-    task_config: dict[str, Any] = {},
+    pipe_result: str = None,
+    input_files: list[dict] = None,
+    output_path: str = None,
+    workflow_id: str = None,
+    task_config: dict[str, Any] = None,
 ) -> str:
     """List containers on a disk.