diff --git a/src/ibl_to_nwb/datainterfaces/_pupil_tracking.py b/src/ibl_to_nwb/datainterfaces/_pupil_tracking.py
index fb7b626..9b4901f 100644
--- a/src/ibl_to_nwb/datainterfaces/_pupil_tracking.py
+++ b/src/ibl_to_nwb/datainterfaces/_pupil_tracking.py
@@ -1,6 +1,7 @@
 """Data Interface for the pupil tracking."""
 
 from pathlib import Path
+from typing import Optional
 
 import numpy as np
 from neuroconv.basedatainterface import BaseDataInterface
@@ -12,7 +13,7 @@
 
 
 class PupilTrackingInterface(BaseDataInterface):
-    def __init__(self, one: ONE, session: str, camera_name: str, revision: str | None = None):
+    def __init__(self, one: ONE, session: str, camera_name: str, revision: Optional[str | None] = None):
         self.one = one
         self.session = session
         self.camera_name = camera_name
diff --git a/src/ibl_to_nwb/datainterfaces/_roi_motion_energy.py b/src/ibl_to_nwb/datainterfaces/_roi_motion_energy.py
index 8ea21d3..0a40f2e 100644
--- a/src/ibl_to_nwb/datainterfaces/_roi_motion_energy.py
+++ b/src/ibl_to_nwb/datainterfaces/_roi_motion_energy.py
@@ -1,4 +1,5 @@
 """Data Interface for the special data type of ROI Motion Energy."""
+from typing import Optional
 
 from neuroconv.basedatainterface import BaseDataInterface
 from neuroconv.tools.nwb_helpers import get_module
@@ -7,7 +8,7 @@
 
 
 class RoiMotionEnergyInterface(BaseDataInterface):
-    def __init__(self, one: ONE, session: str, camera_name: str, revision: str | None = None):
+    def __init__(self, one: ONE, session: str, camera_name: str, revision: Optional[str] = None):
         self.one = one
         self.session = session
         self.camera_name = camera_name