diff --git a/apps/emqx_plugin_libs/src/emqx_plugin_libs.app.src b/apps/emqx_plugin_libs/src/emqx_plugin_libs.app.src
index 67337af21..fe4fff0b5 100644
--- a/apps/emqx_plugin_libs/src/emqx_plugin_libs.app.src
+++ b/apps/emqx_plugin_libs/src/emqx_plugin_libs.app.src
@@ -1,6 +1,6 @@
 {application, emqx_plugin_libs,
  [{description, "EMQ X Plugin utility libs"},
-  {vsn, "4.4.1"},
+  {vsn, "4.4.2"},
   {modules, []},
   {applications, [kernel,stdlib]},
   {env, []}
diff --git a/apps/emqx_plugin_libs/src/emqx_plugin_libs.appup.src b/apps/emqx_plugin_libs/src/emqx_plugin_libs.appup.src
index 10095eed0..46e76ed82 100644
--- a/apps/emqx_plugin_libs/src/emqx_plugin_libs.appup.src
+++ b/apps/emqx_plugin_libs/src/emqx_plugin_libs.appup.src
@@ -1,12 +1,24 @@
 %% -*- mode: erlang -*-
 {VSN,
-  [{"4.4.0",
-    [ {update, emqx_slow_subs, {advanced, ["4.4.0"]}}
+  [{"4.4.1",
+    [ {load_module,emqx_trace,brutal_purge,soft_purge,[]}
+    , {load_module,emqx_trace_api,brutal_purge,soft_purge,[]}
+    ]},
+  {"4.4.0",
+    [ {load_module,emqx_trace,brutal_purge,soft_purge,[]}
+    , {load_module,emqx_trace_api,brutal_purge,soft_purge,[]}
+    , {update, emqx_slow_subs, {advanced, ["4.4.0"]}}
     , {load_module,emqx_slow_subs_api,brutal_purge,soft_purge,[]}
     ]},
    {<<".*">>,[]}],
- [{"4.4.0",
-   [ {update, emqx_slow_subs, {advanced, ["4.4.0"]}}
+ [{"4.4.1",
+    [ {load_module,emqx_trace,brutal_purge,soft_purge,[]}
+    , {load_module,emqx_trace_api,brutal_purge,soft_purge,[]}
+    ]},
+  {"4.4.0",
+   [ {load_module,emqx_trace,brutal_purge,soft_purge,[]}
+   , {load_module,emqx_trace_api,brutal_purge,soft_purge,[]}
+   , {update, emqx_slow_subs, {advanced, ["4.4.0"]}}
    , {load_module,emqx_slow_subs_api,brutal_purge,soft_purge,[]}
    ]},
   {<<".*">>,[]}]
diff --git a/apps/emqx_plugin_libs/src/emqx_trace/emqx_trace_api.erl b/apps/emqx_plugin_libs/src/emqx_trace/emqx_trace_api.erl
index 0e298698e..548b58ae9 100644
--- a/apps/emqx_plugin_libs/src/emqx_trace/emqx_trace_api.erl
+++ b/apps/emqx_plugin_libs/src/emqx_trace/emqx_trace_api.erl
@@ -95,7 +95,8 @@ download_zip_log(#{name := Name}, _Param) ->
             TraceFiles = collect_trace_file(TraceLog),
             ZipDir = emqx_trace:zip_dir(),
             Zips = group_trace_file(ZipDir, TraceLog, TraceFiles),
-            ZipFileName = ZipDir ++ binary_to_list(Name) ++ ".zip",
+            ZipFileName0 = binary_to_list(Name) ++ ".zip",
+            ZipFileName = filename:join([Zips, ZipFileName0]),
             {ok, ZipFile} = zip:zip(ZipFileName, Zips, [{cwd, ZipDir}]),
             emqx_trace:delete_files_after_send(ZipFileName, Zips),
             {ok, ZipFile};
@@ -107,9 +108,10 @@ group_trace_file(ZipDir, TraceLog, TraceFiles) ->
     lists:foldl(fun(Res, Acc) ->
         case Res of
             {ok, Node, Bin} ->
-                ZipName = ZipDir ++ Node ++ "-" ++ TraceLog,
+                FileName = Node ++ "-" ++ TraceLog,
+                ZipName = filename:join([ZipDir, FileName]),
                 case file:write_file(ZipName, Bin) of
-                    ok -> [Node ++ "-" ++ TraceLog | Acc];
+                    ok -> [FileName | Acc];
                     _ -> Acc
                 end;
             {error, Node, Reason} ->