diff --git a/apps/emqx_auth_redis/priv/emqx_auth_redis.schema b/apps/emqx_auth_redis/priv/emqx_auth_redis.schema
index 69a3cf388..299e1bae3 100644
--- a/apps/emqx_auth_redis/priv/emqx_auth_redis.schema
+++ b/apps/emqx_auth_redis/priv/emqx_auth_redis.schema
@@ -43,7 +43,6 @@
   {datatype, string}
 ]}.
 
-%% FIXME: compatible with 4.0-4.2 version format, plan to delete in 5.0
 {mapping, "auth.redis.ssl.certfile", "emqx_auth_redis.options", [
   {default, ""},
   {datatype, string}
@@ -54,40 +53,17 @@
   {datatype, string}
 ]}.
 
-%% FIXME: compatible with 4.0-4.2 version format, plan to delete in 5.0
-{mapping, "auth.redis.cafile", "emqx_auth_redis.options", [
-  {default, ""},
-  {datatype, string}
-]}.
-
-%% FIXME: compatible with 4.0-4.2 version format, plan to delete in 5.0
-{mapping, "auth.redis.certfile", "emqx_auth_redis.options", [
-  {default, ""},
-  {datatype, string}
-]}.
-
-%% FIXME: compatible with 4.0-4.2 version format, plan to delete in 5.0
-{mapping, "auth.redis.keyfile", "emqx_auth_redis.options", [
-  {default, ""},
-  {datatype, string}
-]}.
-
 {translation, "emqx_auth_redis.options", fun(Conf) ->
-   Ssl = cuttlefish:conf_get("auth.redis.ssl.enable", Conf, false),
-   case Ssl of
+   case cuttlefish:conf_get("auth.redis.ssl.enable", Conf, false) of
        true ->
-           %% FIXME: compatible with 4.0-4.2 version format, plan to delete in 5.0
-           Prefix = case cuttlefish:conf_get("auth.redis.ssl.cacertfile", Conf, undefined) of
-               undefined -> "auth.redis";
-               _ -> "auth.redis.ssl"
-           end,
-           CA = cuttlefish:conf_get(Prefix ++ ".cacertfile", Conf),
-           Cert = cuttlefish:conf_get(Prefix ++ ".certfile", Conf),
-           Key = cuttlefish:conf_get(Prefix ++ ".keyfile", Conf),
+           CA = cuttlefish:conf_get("auth.redis.ssl.cacertfile", Conf),
+           Cert = cuttlefish:conf_get("auth.redis.ssl.certfile", Conf),
+           Key = cuttlefish:conf_get("auth.redis.ssl.keyfile", Conf),
            [{options, [{ssl_options, [{cacertfile, CA},
                                       {certfile, Cert},
                                       {keyfile, Key}]}]}];
-       _ -> [{options, []}]
+       false ->
+           [{options, []}]
    end
 end}.