diff --git a/context/nextjs/etc/nginx/templates/default.conf.template b/context/nextjs/etc/nginx/templates/default.conf.template
index 9652600..1d4b24f 100644
--- a/context/nextjs/etc/nginx/templates/default.conf.template
+++ b/context/nextjs/etc/nginx/templates/default.conf.template
@@ -12,7 +12,10 @@ server {
         proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
     }
 
-    location /_next/webpack-hmr {
+    # Dev HMR websocket. Turbopack (Next 16 default) uses /_next/hmr, webpack
+    # uses /_next/webpack-hmr. A failed upgrade breaks client hydration, so
+    # cover both. Regex beats the `location /` prefix, so these still match here.
+    location ~ ^/_next/(webpack-)?hmr {
         proxy_pass ${NGINX_PROXY_PASS};
         proxy_http_version 1.1;
         proxy_set_header Upgrade $http_upgrade;