diff --git a/apps/emqx_exproto/src/emqx_exproto.app.src b/apps/emqx_exproto/src/emqx_exproto.app.src
index e2c674779..f7cab4c2e 100644
--- a/apps/emqx_exproto/src/emqx_exproto.app.src
+++ b/apps/emqx_exproto/src/emqx_exproto.app.src
@@ -1,6 +1,6 @@
 {application, emqx_exproto,
  [{description, "EMQ X Extension for Protocol"},
-  {vsn, "4.3.3"}, %% strict semver
+  {vsn, "4.3.4"}, %% 4.3.3 is used by ee
   {modules, []},
   {registered, []},
   {mod, {emqx_exproto_app, []}},
diff --git a/apps/emqx_exproto/src/emqx_exproto.appup.src b/apps/emqx_exproto/src/emqx_exproto.appup.src
index b5cd29869..6b8dde713 100644
--- a/apps/emqx_exproto/src/emqx_exproto.appup.src
+++ b/apps/emqx_exproto/src/emqx_exproto.appup.src
@@ -1,6 +1,7 @@
 %% -*-: erlang -*-
 {VSN,
  [
+    {"4.3.3", []}, %% 4.3.3 is used by ee
     {"4.3.2", [
       {load_module, emqx_exproto_conn, brutal_purge, soft_purge, []},
       {load_module, emqx_exproto_channel, brutal_purge, soft_purge, []}
@@ -14,6 +15,7 @@
     {<<".*">>, []}
  ],
  [
+    {"4.3.3", []}, %% 4.3.3 is used by ee
     {"4.3.2", [
       {load_module, emqx_exproto_conn, brutal_purge, soft_purge, []},
       {load_module, emqx_exproto_channel, brutal_purge, soft_purge, []}
diff --git a/apps/emqx_exproto/src/emqx_exproto_channel.erl b/apps/emqx_exproto/src/emqx_exproto_channel.erl
index 4c9dca5d5..be609860e 100644
--- a/apps/emqx_exproto/src/emqx_exproto_channel.erl
+++ b/apps/emqx_exproto/src/emqx_exproto_channel.erl
@@ -158,7 +158,6 @@ init(ConnInfo = #{socktype := Socktype,
                        conn_state = connecting,
                        timers = #{}
                       },
-    %% Check license limitation
     case emqx_hooks:run_fold('client.connect', [NConnInfo], #{}) of
         {error, _Reason} ->
             throw(nopermission);