diff --git a/apps/emqx_prometheus/rebar.config b/apps/emqx_prometheus/rebar.config
index 7b9a6cc48..ea0bd57a6 100644
--- a/apps/emqx_prometheus/rebar.config
+++ b/apps/emqx_prometheus/rebar.config
@@ -3,7 +3,7 @@
 {deps, [
     {emqx, {path, "../emqx"}},
     {emqx_utils, {path, "../emqx_utils"}},
-    {prometheus, {git, "https://github.com/deadtrickster/prometheus.erl", {tag, "v4.8.1"}}}
+    {prometheus, {git, "https://github.com/emqx/prometheus.erl", {branch, "enhance-sample-perf"}}}
 ]}.
 
 {edoc_opts, [{preprocess, true}]}.
diff --git a/apps/emqx_prometheus/src/emqx_prometheus_schema.erl b/apps/emqx_prometheus/src/emqx_prometheus_schema.erl
index a33eaa5e7..d657e0772 100644
--- a/apps/emqx_prometheus/src/emqx_prometheus_schema.erl
+++ b/apps/emqx_prometheus/src/emqx_prometheus_schema.erl
@@ -170,4 +170,7 @@ validate_push_gateway_server(Url) ->
 
 %% for CI test, CI don't load the whole emqx_conf_schema.
 translation(Name) ->
+    %% translate 'vm_dist_collector', 'mnesia_collector', 'vm_statistics_collector',
+    %% 'vm_system_info_collector', 'vm_memory_collector', 'vm_msacc_collector'
+    %% to prometheus envrionments
     emqx_conf_schema:translation(Name).