diff --git a/src/api/invitations.py b/src/api/invitations.py
index 7792ffb..0921093 100644
--- a/src/api/invitations.py
+++ b/src/api/invitations.py
@@ -224,7 +224,7 @@ async def delete_invitation(invitation_id: PydanticObjectId, user: CurrentUserDe
 
 
 @invitations_router.post("/{invitation_id}/accept")
-async def accept_invitation(invitation_id: PydanticObjectId, user: CurrentUserDep) -> Response:
+async def accept_invitation(invitation_id: PydanticObjectId, user: CurrentUserDep) -> InvitationData:
     """Accept an invitation."""
     invitation = await Invitation.get(invitation_id, fetch_links=True)
     if invitation is None:
@@ -242,7 +242,7 @@ async def accept_invitation(invitation_id: PydanticObjectId, user: CurrentUserDe
     # Mark the invitation as accepted
     invitation.status = "accepted"
     invitation.responded_at = datetime.now(tz=UTC)
-    _ = await invitation.save()
+    _ = await invitation.replace()
 
     # Add the user to the event
     event = invitation.event
@@ -262,11 +262,11 @@ async def accept_invitation(invitation_id: PydanticObjectId, user: CurrentUserDe
     )
     notification = await notification.create()
 
-    return Response(status_code=status.HTTP_204_NO_CONTENT)
+    return InvitationData.from_invitation(invitation)
 
 
 @invitations_router.post("/{invitation_id}/decline")
-async def decline_invitation(invitation_id: PydanticObjectId, user: CurrentUserDep) -> Response:
+async def decline_invitation(invitation_id: PydanticObjectId, user: CurrentUserDep) -> InvitationData:
     """Decline an invitation."""
     invitation = await Invitation.get(invitation_id, fetch_links=True)
     if invitation is None:
@@ -283,7 +283,7 @@ async def decline_invitation(invitation_id: PydanticObjectId, user: CurrentUserD
 
     invitation.status = "declined"
     invitation.responded_at = datetime.now(tz=UTC)
-    _ = await invitation.save()
+    _ = await invitation.replace()
 
     # Send back a notification to the invitor about the decline
     notification = Notification(
@@ -295,7 +295,7 @@ async def decline_invitation(invitation_id: PydanticObjectId, user: CurrentUserD
     )
     notification = await notification.create()
 
-    return Response(status_code=status.HTTP_204_NO_CONTENT)
+    return InvitationData.from_invitation(invitation)
 
 
 router = APIRouter()