diff --git a/src/tracker/api/tasks.py b/src/tracker/api/tasks.py
index 9d5ea8b..1c321c5 100644
--- a/src/tracker/api/tasks.py
+++ b/src/tracker/api/tasks.py
@@ -227,7 +227,9 @@ async def create_task(
     current_member: Member = Depends(get_current_member),
     db: AsyncSession = Depends(get_db),
 ):
-    result = await db.execute(select(Project).where(Project.slug == project_slug))
+    result = await db.execute(
+        select(Project).where(Project.slug == project_slug).with_for_update()
+    )
     project = result.scalar_one_or_none()
     if not project:
         raise HTTPException(404, "Project not found")