diff --git a/plugins/openresty/conf/nginx.conf b/plugins/openresty/conf/nginx.conf
index 066868f62..9533df6c7 100644
--- a/plugins/openresty/conf/nginx.conf
+++ b/plugins/openresty/conf/nginx.conf
@@ -51,7 +51,7 @@ http
     gzip_min_length  1k;
     gzip_buffers     4 16k;
     gzip_http_version 1.1;
-    gzip_comp_level 2;
+    gzip_comp_level 9;
     gzip_types     text/plain application/javascript application/x-javascript text/javascript text/css application/xml;
     gzip_vary on;
     gzip_proxied   expired no-cache no-store private auth;