diff --git a/lib/proxy/proxy.go b/lib/proxy/proxy.go
index cab5966e..d8cd1266 100644
--- a/lib/proxy/proxy.go
+++ b/lib/proxy/proxy.go
@@ -110,6 +110,7 @@ server {
         proxy_set_header   Host $http_host;
         proxy_set_header   X-Forwarded-For $proxy_add_x_forwarded_for;
         proxy_set_header   X-Forwarded-Proto $scheme;
+        proxy_http_version 1.1;
         proxy_set_header   Upgrade $http_upgrade;
         proxy_set_header   Connection $http_connection;
     }