diff --git a/CHANGES-4.3.md b/CHANGES-4.3.md
index f3f2d5ea0..83a9bfcf6 100644
--- a/CHANGES-4.3.md
+++ b/CHANGES-4.3.md
@@ -20,6 +20,7 @@ File format:
 * Better randomisation of app screts (changed from timestamp seeded sha hash (uuid) to crypto:strong_rand_bytes)
 * Return a client_identifier_not_valid error when username is empty and username_as_clientid is set to true [#7862]
 * Add more rule engine date functions: format_date/3, format_date/4, date_to_unix_ts/4 [#7894]
+* Add proto_name and proto_ver fields for $event/client_disconnected event.
 
 ### Bug fixes
 * List subscription topic (/api/v4/subscriptions), the result do not match with multiple conditions.
diff --git a/apps/emqx_rule_engine/src/emqx_rule_engine.appup.src b/apps/emqx_rule_engine/src/emqx_rule_engine.appup.src
index 36d3605e6..25438c828 100644
--- a/apps/emqx_rule_engine/src/emqx_rule_engine.appup.src
+++ b/apps/emqx_rule_engine/src/emqx_rule_engine.appup.src
@@ -2,7 +2,8 @@
 %% Unless you know what you are doing, DO NOT edit manually!!
 {VSN,
   [{"4.3.9",
-    [{load_module,emqx_rule_funcs,brutal_purge,soft_purge,[]},
+    [{load_module,emqx_rule_events,brutal_purge,soft_purge,[]},
+     {load_module,emqx_rule_funcs,brutal_purge,soft_purge,[]},
      {add_module,emqx_rule_date},
      {load_module,emqx_rule_maps,brutal_purge,soft_purge,[]},
      {load_module,emqx_rule_registry,brutal_purge,soft_purge,[]}]},
@@ -131,7 +132,8 @@
      {load_module,emqx_rule_engine_api,brutal_purge,soft_purge,[]}]},
    {<<".*">>,[]}],
   [{"4.3.9",
-    [{load_module,emqx_rule_funcs,brutal_purge,soft_purge,[]},
+    [{load_module,emqx_rule_events,brutal_purge,soft_purge,[]},
+     {load_module,emqx_rule_funcs,brutal_purge,soft_purge,[]},
      {load_module,emqx_rule_maps,brutal_purge,soft_purge,[]},
      {load_module,emqx_rule_registry,brutal_purge,soft_purge,[]},
      {delete_module,emqx_rule_date}]},
diff --git a/apps/emqx_rule_engine/src/emqx_rule_events.erl b/apps/emqx_rule_engine/src/emqx_rule_events.erl
index 363475d60..01339edbb 100644
--- a/apps/emqx_rule_engine/src/emqx_rule_events.erl
+++ b/apps/emqx_rule_engine/src/emqx_rule_events.erl
@@ -208,6 +208,8 @@ eventmsg_disconnected(_ClientInfo = #{
                       ConnInfo = #{
                         peername := PeerName,
                         sockname := SockName,
+                        proto_name := ProtoName,
+                        proto_ver := ProtoVer,
                         disconnected_at := DisconnectedAt
                       }, Reason) ->
     with_basic_columns('client.disconnected',
@@ -216,6 +218,8 @@ eventmsg_disconnected(_ClientInfo = #{
           username => Username,
           peername => ntoa(PeerName),
           sockname => ntoa(SockName),
+          proto_name => ProtoName,
+          proto_ver => ProtoVer,
           disconn_props => printable_maps(maps:get(disconn_props, ConnInfo, #{})),
           disconnected_at => DisconnectedAt
         }).
@@ -597,6 +601,8 @@ columns_with_exam('client.disconnected') ->
     , {<<"username">>, <<"u_emqx">>}
     , {<<"peername">>, <<"192.168.0.10:56431">>}
     , {<<"sockname">>, <<"0.0.0.0:1883">>}
+    , {<<"proto_name">>, <<"MQTT">>}
+    , {<<"proto_ver">>, 5}
     , {<<"disconnected_at">>, erlang:system_time(millisecond)}
     , {<<"timestamp">>, erlang:system_time(millisecond)}
     , {<<"node">>, node()}