diff --git a/src/emqx_session.erl b/src/emqx_session.erl
index 0364bde61..a5b723b59 100644
--- a/src/emqx_session.erl
+++ b/src/emqx_session.erl
@@ -201,13 +201,11 @@ init_mqueue(Zone) ->
 
 %% @doc uprade from 4.3
 upgrade(CInfo, S) ->
-    ?LOG(warning, "upgrading from 4.3", []),
     [session | Fields] = tuple_to_list(S),
     #session{} = list_to_tuple([session, ?GET_CLIENT_ID(CInfo) | Fields] ++ [#{}]).
 
 %% @doc Downgrade to 4.3
 downgrade(#session{} = S) ->
-    ?LOG(warning, "downgrading to 4.3", []),
     [session, _ClientID | Fields] = tuple_to_list(S),
     list_to_tuple([session | lists:reverse(tl(lists:reverse(Fields)))]).