diff --git a/README.md b/README.md
index be903b2..36cf096 100644
--- a/README.md
+++ b/README.md
@@ -58,3 +58,8 @@ mysql --host db -uroot -p ${MYSQL_DATABASE} < /db-dumps/$DB_FILE
 #root password (root password is the enviromnent variable ${MYSQL_ROOT_PASSWORD})
 ```
 
+## Maintenance
+
+* 2024-02-19
+It is only possible to upgrade one major version at a time.  
+
diff --git a/docker/Dockerfile b/docker/Dockerfile
index c75f424..caf5de2 100644
--- a/docker/Dockerfile
+++ b/docker/Dockerfile
@@ -1,3 +1,3 @@
-#image name : nextcloud-smbclient:25.0
-FROM nextcloud:25.0
-RUN apt update;apt install -y smbclient libsmbclient-dev;pecl install smbclient;echo "extension=smbclient.so" >> /usr/local/etc/php/conf.d/nextcloud.ini 
\ No newline at end of file
+#image name : nextcloud-smbclient:28.0
+FROM nextcloud:28.0
+RUN apt update;apt install -y smbclient libsmbclient-dev;pecl install smbclient;echo "extension=smbclient.so" >> /usr/local/etc/php/conf.d/nextcloud.ini; echo "extension=smbclient.so" >> /usr/local/etc/php.ini
\ No newline at end of file
diff --git a/docker/docker-compose.yaml b/docker/docker-compose.yaml
index 34a3e4a..9ae9e14 100644
--- a/docker/docker-compose.yaml
+++ b/docker/docker-compose.yaml
@@ -12,7 +12,7 @@ services:
       - MYSQL_DATABASE=${MYSQL_DATABASE}
       - MYSQL_USER=${MYSQL_USER}
   app:
-    image: nextcloud-smbclient:25.0
+    image: nextcloud-smbclient:28.0
     restart: always
     ports:
       - ${APP_PORT}:80