diff --git a/deployment/nginx.conf b/deployment/nginx.conf
index 2472cb1..2c9bd85 100644
--- a/deployment/nginx.conf
+++ b/deployment/nginx.conf
@@ -11,7 +11,7 @@ http {
             proxy_set_header Host $host;
             proxy_http_version 1.1;
             proxy_set_header Upgrade $http_upgrade;
-            proxy_set_header Connection $connection_upgrade;
+            proxy_set_header Connection "upgrade";
             proxy_set_header X-Real-IP $remote_addr;
             proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
             proxy_set_header X-Forwarded-Proto $scheme;
@@ -22,7 +22,7 @@ http {
             proxy_set_header Host $host;
             proxy_http_version 1.1;
             proxy_set_header Upgrade $http_upgrade;
-            proxy_set_header Connection $connection_upgrade;
+            proxy_set_header Connection "upgrade";
             proxy_set_header X-Real-IP $remote_addr;
             proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
             proxy_set_header X-Forwarded-Proto $scheme;