diff --git a/src/sentry/tasks/update_user_reports.py b/src/sentry/tasks/update_user_reports.py
index 07711127e58103..1a075ccbfd9327 100644
--- a/src/sentry/tasks/update_user_reports.py
+++ b/src/sentry/tasks/update_user_reports.py
@@ -1,6 +1,5 @@
 import logging
-from datetime import timedelta
-from typing import Any
+from datetime import datetime, timedelta
 
 import sentry_sdk
 from django.utils import timezone
@@ -31,13 +30,26 @@
         namespace=issues_tasks,
     ),
 )
-def update_user_reports(**kwargs: Any) -> None:
+def update_user_reports(
+    start_datetime: str | None = None,
+    end_datetime: str | None = None,
+    max_events: int | None = None,
+    event_lookback_days: int | None = None,
+) -> None:
     now = timezone.now()
-    start = kwargs.get("start", now - timedelta(days=1))
-    end = kwargs.get("end", now + timedelta(minutes=5))  # +5 minutes just to catch clock skew
+    start = now - timedelta(days=1)
+    # +5 minutes just to catch clock skew
+    end = now + timedelta(minutes=5)
+
+    if start_datetime:
+        start = datetime.fromisoformat(start_datetime)
+    if end_datetime:
+        end = datetime.fromisoformat(end_datetime)
 
     # The event query time range is [start - event_lookback, end].
-    event_lookback = kwargs.get("event_lookback", timedelta(days=1))
+    if event_lookback_days is None:
+        event_lookback_days = 1
+    event_lookback = timedelta(days=event_lookback_days)
 
     # Filter for user reports where there was no event associated with them at
     # ingestion time
@@ -57,10 +69,8 @@ def update_user_reports(**kwargs: Any) -> None:
     updated_reports = 0
     samples = None
 
-    MAX_EVENTS = kwargs.get(
-        "max_events",
-        2000,  # the default max_query_size is 256 KiB, which we're hitting with 5000 events, so keeping it safe at 2000
-    )
+    # the default max_query_size is 256 KiB, which we're hitting with 5000 events, so keeping it safe at 2000
+    MAX_EVENTS = max_events or 2000
     for project_id, reports in project_map.items():
         project = Project.objects.get(id=project_id)
         event_ids = [r.event_id for r in reports]
diff --git a/tests/sentry/tasks/test_update_user_reports.py b/tests/sentry/tasks/test_update_user_reports.py
index a02d50c8be265c..794f7f9e5e8265 100644
--- a/tests/sentry/tasks/test_update_user_reports.py
+++ b/tests/sentry/tasks/test_update_user_reports.py
@@ -64,7 +64,7 @@ def test_report_timerange(self):
         )
 
         with self.tasks():
-            update_user_reports(start=start, end=end)
+            update_user_reports(start_datetime=start.isoformat(), end_datetime=end.isoformat())
 
         report1 = UserReport.objects.get(project_id=project.id, event_id=event1.event_id)
         report2 = UserReport.objects.get(project_id=project.id, event_id=event2.event_id)
@@ -106,7 +106,11 @@ def test_event_timerange(self):
         )
 
         with self.tasks():
-            update_user_reports(start=start, end=end, event_lookback=event_lookback)
+            update_user_reports(
+                start_datetime=start.isoformat(),
+                end_datetime=end.isoformat(),
+                event_lookback_days=event_lookback.days,
+            )
 
         report1 = UserReport.objects.get(project_id=project.id, event_id=event1.event_id)
         report2 = UserReport.objects.get(project_id=project.id, event_id=event2.event_id)
@@ -207,7 +211,11 @@ def test_event_retention(self, mock_get_event_retention):
         self.create_event_and_report(project.id, event_dt=event_dt, report_dt=report_dt)
 
         with self.tasks():
-            update_user_reports(start=epoch, end=now, event_lookback=event_lookback)
+            update_user_reports(
+                start_datetime=epoch.isoformat(),
+                end_datetime=now.isoformat(),
+                event_lookback_days=event_lookback.days,
+            )
 
         assert mock_get_event_retention.call_count > 0
         report = UserReport.objects.get()