diff --git a/src/esockd.appup.src b/src/esockd.appup.src
index 49b51b5..50677bf 100644
--- a/src/esockd.appup.src
+++ b/src/esockd.appup.src
@@ -1,7 +1,7 @@
 %%-*- mode: erlang; -*-
 
-{"5.8.7",
-  [{"5.8.6",[{load_module,esockd_transport,brutal_purge,soft_purge,[]}]},
+{"5.8.8",
+  [{<<"5\\.8\\.[6-7]">>,[{load_module,esockd_transport,brutal_purge,soft_purge,[]}]},
    {<<"5\\.8\\.[4-5]">>,
     [{load_module,esockd_udp,brutal_purge,soft_purge,[]},
      {load_module,esockd_transport,brutal_purge,soft_purge,[]}
@@ -21,7 +21,7 @@
     ]},
    {<<".*">>, []}
   ],
-  [{"5.8.6",[{load_module,esockd_transport,brutal_purge,soft_purge,[]}]},
+  [{<<"5\\.8\\.[6-7]">>,[{load_module,esockd_transport,brutal_purge,soft_purge,[]}]},
    {<<"5\\.8\\.[4-5]">>,
     [{load_module,esockd_udp,brutal_purge,soft_purge,[]},
      {load_module,esockd_transport,brutal_purge,soft_purge,[]}
diff --git a/src/esockd_transport.erl b/src/esockd_transport.erl
index f5e4957..77d4484 100644
--- a/src/esockd_transport.erl
+++ b/src/esockd_transport.erl
@@ -349,6 +349,10 @@ ssl_upgrade_fun(SslOpts) ->
     {fun ?MODULE:ssl_upgrade/3, [SslOpts2, #{timeout => Timeout,
                                              gc_after_handshake => GCAfterHandshake}]}.
 
+%% NOTE: The first clause of the function `ssl_upgrade` (with an integer parameter
+%% `Timeout`) will be called by the running process after relup. So don't delete it.
+ssl_upgrade(Sock, SslOpts1, Timeout) when is_integer(Timeout) ->
+    ssl_upgrade(Sock, SslOpts1, #{timeout => Timeout, gc_after_handshake => false});
 ssl_upgrade(Sock, SslOpts1, #{timeout := Timeout,
                               gc_after_handshake := GCAfterHandshake}) ->
     try do_ssl_handshake(Sock, SslOpts1, Timeout) of