diff --git a/compose.yml b/compose.yml
index d99117c..92ab617 100644
--- a/compose.yml
+++ b/compose.yml
@@ -11,6 +11,8 @@ services:
       - internal
     environment:
       - "DB_HOST=${STACK_NAME}_db"
+      - "DB_TYPE=pgsql"
+      - "DB_PORT=5432"
       - "DB_PASSWORD_FILE=/run/secrets/db_password"
       - ADMIN_EMAIL
       - ADMIN_NAME
@@ -48,29 +50,27 @@ services:
       retries: 10
       start_period: 1m
   db:
-    image: mysql:5.7
+    image: postgres:14-alpine
     networks:
       - internal
     environment:
-      - "MYSQL_USER=limesurvey"
-      - "MYSQL_DATABASE=limesurvey"
-      - "MYSQL_PASSWORD_FILE=/run/secrets/db_password"
-      - "MYSQL_ROOT_PASSWORD_FILE=/run/secrets/db_root_password"
-    volumes:
-      - mariadb:/var/lib/mysql
+      - POSTGRES_DB=limesurvey
+      - POSTGRES_USER=limesurvey
+      - POSTGRES_PASSWORD_FILE=/run/secrets/db_password
     secrets:
       - db_password
-      - db_root_password
+    volumes:
+      - postgres:/var/lib/postgresql/data
     deploy:
       labels:
           backupbot.backup: "true"
-          backupbot.backup.pre-hook: 'mkdir -p /tmp/backup/ && mysqldump --single-transaction -u root -p"$$(cat /run/secrets/db_root_password)" limesurvey > /tmp/backup/backup.sql'
+          backupbot.backup.pre-hook: "mkdir -p /tmp/backup/ && PGPASSWORD=$$(cat $${POSTGRES_PASSWORD_FILE}) pg_dump -U $${POSTGRES_USER} $${POSTGRES_DB} > /tmp/backup/backup.sql"
           backupbot.backup.post-hook: "rm -rf /tmp/backup"
           backupbot.backup.path: "/tmp/backup/"
 
 volumes:
   app:
-  mariadb:
+  postgres:
 
 networks:
   proxy:
@@ -83,9 +83,6 @@ configs:
     file: entrypoint.sh
 
 secrets:
-  db_root_password:
-    external: true
-    name: ${STACK_NAME}_db_root_password_${SECRET_DB_ROOT_PASSWORD_VERSION}
   db_password:
     external: true
     name: ${STACK_NAME}_db_password_${SECRET_DB_PASSWORD_VERSION}