diff --git a/pica-whiteboard/default.conf b/pica-whiteboard/default.conf
index f4a85715b8de9429c96938e77e1575753d1d4130..489d4eb77d291fb088b63e0ca57d14bc1d2d10e5 100644
--- a/pica-whiteboard/default.conf
+++ b/pica-whiteboard/default.conf
@@ -15,5 +15,8 @@ server {
 		proxy_set_header Host $host;
 		proxy_set_header X-Real-IP $remote_addr;
 		proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+		proxy_http_version 1.1;
+		proxy_set_header Upgrade $http_upgrade;
+		proxy_set_header Connection upgrade;
 	}
 }