diff --git a/.env.example b/.env.example
index d84511e8..7c3e4039 100644
--- a/.env.example
+++ b/.env.example
@@ -6,13 +6,15 @@
 # Please refer to our documentation to see all possible variables:
 #   https://www.openproject.org/docs/installation-and-operations/configuration/environment/
 #
-TAG=15-slim
+TAG=16-slim
 OPENPROJECT_HTTPS=false
 OPENPROJECT_HOST__NAME=localhost
-PORT=127.0.0.1:8080
+OPENPROJECT_HSTS=true
+PORT=8080
 OPENPROJECT_RAILS__RELATIVE__URL__ROOT=
 IMAP_ENABLED=false
-DATABASE_URL=postgres://postgres:p4ssw0rd@db/openproject?pool=20&encoding=unicode&reconnect=true
+POSTGRES_PASSWORD=p4ssw0rd
+DATABASE_URL=postgres://postgres:${POSTGRES_PASSWORD}/openproject?pool=20&encoding=unicode&reconnect=true
 RAILS_MIN_THREADS=4
 RAILS_MAX_THREADS=16
 PGDATA="/var/lib/postgresql/data"