diff --git a/openhexa/toolbox/dhis2/dhis2.py b/openhexa/toolbox/dhis2/dhis2.py
index 940c42f..23d2b73 100644
--- a/openhexa/toolbox/dhis2/dhis2.py
+++ b/openhexa/toolbox/dhis2/dhis2.py
@@ -560,7 +560,7 @@ def get(
         data_elements: List[str] = None,
         datasets: List[str] = None,
         data_element_groups: List[str] = None,
-        periods: List[str | Period] = None,
+        periods: List[Union[str, Period]] = None,
         start_date: str = None,
         end_date: str = None,
         org_units: List[str] = None,
@@ -972,7 +972,7 @@ def get(
         data_element_groups: List[str] = None,
         indicators: List[str] = None,
         indicator_groups: List[str] = None,
-        periods: List[str | Period] = None,
+        periods: Union[str, Period] = None,
         org_units: List[str] = None,
         org_unit_groups: List[str] = None,
         org_unit_levels: List[int] = None,