diff --git a/conf/nginx.conf b/conf/nginx.conf
index 5c95f86..a1dfbf9 100644
--- a/conf/nginx.conf
+++ b/conf/nginx.conf
@@ -48,7 +48,7 @@
     location = __PATH__/srv/status {
       access_log off;
       log_not_found off;
-      proxy_set_header Host $http_host;
+      proxy_set_header Host $host;
       proxy_set_header X-Real-IP $remote_addr;
       proxy_set_header X-Request-Start "t=${msec}";
       proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
@@ -93,7 +93,7 @@
       #
       # proxy_set_header DOES NOT inherit, by design, we must repeat it,
       # otherwise headers are not set correctly
-      proxy_set_header Host $http_host;
+      proxy_set_header Host $host;
       proxy_set_header X-Real-IP $remote_addr;
       proxy_set_header X-Request-Start "t=${msec}";
       proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
@@ -125,7 +125,7 @@
     }
 
     location ~ ^/admin/backups/ {
-      proxy_set_header Host $http_host;
+      proxy_set_header Host $host;
       proxy_set_header X-Real-IP $remote_addr;
       proxy_set_header X-Request-Start "t=${msec}";
       proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
@@ -140,7 +140,7 @@
     # acceleration for backups and avatars
     # see note about repetition above
     location ~ ^/(letter_avatar/|user_avatar|highlight-js|stylesheets|favicon/proxied|service-worker) {
-      proxy_set_header Host $http_host;
+      proxy_set_header Host $host;
       proxy_set_header X-Real-IP $remote_addr;
       proxy_set_header X-Request-Start "t=${msec}";
       proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
@@ -183,7 +183,7 @@
     # we need buffering off for message bus
     location __PATH__/message-bus/ {
       proxy_set_header X-Request-Start "t=${msec}";
-      proxy_set_header Host $http_host;
+      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_set_header X-Forwarded-Proto https;
@@ -204,7 +204,7 @@
 
   location @__NAME__ {
     more_set_headers "Referrer-Policy : no-referrer-when-downgrade";
-    proxy_set_header Host $http_host;
+    proxy_set_header Host $host;
     proxy_set_header X-Request-Start "t=${msec}";
     proxy_set_header X-Real-IP $remote_addr;
     proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
diff --git a/scripts/_common.sh b/scripts/_common.sh
index 10d395d..5b9f7ca 100644
--- a/scripts/_common.sh
+++ b/scripts/_common.sh
@@ -9,7 +9,7 @@
 pkg_dependencies="postgresql postgresql-client postgresql-contrib imagemagick libjemalloc1|libjemalloc2"
 build_pkg_dependencies="libcurl4-openssl-dev libyaml-dev libxml2-dev libpq-dev libreadline-dev brotli libunwind-dev libtcmalloc-minimal4 cmake pngcrush pngquant advancecomp jhead jpegoptim libjpeg-turbo-progs optipng"
 
-ruby_version="2.7.6"
+ruby_version="3.0.0"
 
 nodejs_version="16"