diff --git a/changelog/items/other/min-free-param.md b/changelog/items/other/min-free-param.md
new file mode 100644
index 00000000..0a6239f3
--- /dev/null
+++ b/changelog/items/other/min-free-param.md
@@ -0,0 +1 @@
+- Set `min_free` parameter on the `proxy_cache_path` directive to `100g`
diff --git a/docker/nginx/nginx.conf b/docker/nginx/nginx.conf
index a6883cb8..c8da6b0f 100644
--- a/docker/nginx/nginx.conf
+++ b/docker/nginx/nginx.conf
@@ -70,7 +70,7 @@ http {
     proxy_http_version 1.1;
 
     # proxy cache definition
-    proxy_cache_path /data/nginx/cache levels=1:2 keys_zone=skynet:10m max_size=50g inactive=48h use_temp_path=off;
+    proxy_cache_path /data/nginx/cache levels=1:2 keys_zone=skynet:10m max_size=50g min_free=100g inactive=48h use_temp_path=off;
 
     # this runs before forking out nginx worker processes
     init_by_lua_block {