diff --git a/.env b/.env
index c98fdde..3dab01a 100644
--- a/.env
+++ b/.env
@@ -5,4 +5,4 @@ POSTGRES_USER=zammad
 REDIS_URL=redis://zammad-redis:6379
 RESTART=always
 # don't forget to add the minus before the version
-VERSION=-5.2.3-18
+VERSION=-5.2.3-32
diff --git a/.github/dependabot.yml b/.github/dependabot.yml
index d991fb6..55fceac 100644
--- a/.github/dependabot.yml
+++ b/.github/dependabot.yml
@@ -8,20 +8,6 @@ updates:
       time: "09:00"
       timezone: "Europe/Berlin"
 
-  - package-ecosystem: "docker"
-    directory: "/containers/zammad-elasticsearch"
-    schedule:
-      interval: "weekly"
-      time: "09:00"
-      timezone: "Europe/Berlin"
-
-  - package-ecosystem: "docker"
-    directory: "/containers/zammad-postgresql"
-    schedule:
-      interval: "weekly"
-      time: "09:00"
-      timezone: "Europe/Berlin"
-
   - package-ecosystem: "github-actions"
     directory: "/"
     schedule:
diff --git a/.github/docker-image-build.sh b/.github/docker-image-build.sh
index d119540..fbe0f14 100755
--- a/.github/docker-image-build.sh
+++ b/.github/docker-image-build.sh
@@ -5,10 +5,7 @@
 set -o errexit
 set -o pipefail
 
-DOCKER_IMAGES="zammad zammad-elasticsearch zammad-postgresql"
+DOCKER_IMAGE="zammad"
 
-# shellcheck disable=SC2153
-for DOCKER_IMAGE in ${DOCKER_IMAGES}; do
-  echo "Build Zammad Docker image ${DOCKER_IMAGE} for local or ci tests"
-  docker build --pull --no-cache --build-arg BUILD_DATE="$(date -u +'%Y-%m-%dT%H:%M:%SZ')" -t "${DOCKER_IMAGE}-local" -f "containers/${DOCKER_IMAGE}/Dockerfile" .
-done
+echo "Build Zammad Docker image ${DOCKER_IMAGE} for local or ci tests"
+docker build --pull --no-cache --build-arg BUILD_DATE="$(date -u +'%Y-%m-%dT%H:%M:%SZ')" -t "${DOCKER_IMAGE}-local" -f "containers/${DOCKER_IMAGE}/Dockerfile" .
diff --git a/.github/workflows/ci-remote-image.yaml b/.github/workflows/ci-remote-image.yaml
index 327c995..1f387b9 100644
--- a/.github/workflows/ci-remote-image.yaml
+++ b/.github/workflows/ci-remote-image.yaml
@@ -9,7 +9,7 @@ on:
 jobs:
   run-remote-image-docker-compose:
     timeout-minutes: 20
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-22.04
     steps:
       - name: Checkout
         uses: actions/checkout@v3
diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 7dd6458..5fbfed3 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -6,7 +6,7 @@ on:
 
 jobs:
   lint-docker-compose-file:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-22.04
     steps:
       - name: Checkout
         uses: actions/checkout@v3
@@ -15,7 +15,7 @@ jobs:
         run: docker-compose config
 
   super-linter:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-22.04
     steps:
       - name: Checkout Code
         uses: actions/checkout@v3
@@ -36,7 +36,7 @@ jobs:
       - lint-docker-compose-file
       - super-linter
     timeout-minutes: 20
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-22.04
     steps:
       - name: Checkout
         uses: actions/checkout@v3
diff --git a/README.md b/README.md
index d26066a..087e956 100644
--- a/README.md
+++ b/README.md
@@ -46,6 +46,59 @@ Elasticsearch is enabled by default in the example `docker-compose.yml` file. It
 
 ## Upgrading
 
+### From =< to 5.0.0 to 5.2.3-32
+
+* Elasticsearch was updated from 7.17.3 to 8.5.0 using the Bitnami image
+  * We don't use a custom build of the docker image anymore as ingest-attachment is no longer a plugin but instead a module packaged with this distribution of Elasticsearch
+  * ELASTICSEARCH_REINDEX var should be set to true
+
+* PostgreSql was updated from 9.6.24 to 15.0.0
+  * We don't use a custom build of the docker image anymore as we just mount the backup script to the postgres container now
+  * backup / restore ins needed to update
+    * you can create a new backup (with your old postgres 9.6 version / still in previous git version) by:
+      * if you already have checked out the newest commit
+        * `git checkout cd424e98689b8dc49878a37b9aab67192c36fd24`
+      * docker-compose stop
+      * docker-compose up
+      * check docker logs until "backup finished :)" is shown as last(!) entry
+        * `docker logs -f zammad-docker-compose_zammad-backup_1`
+      * `docker-compose stop`
+    * you can restore the backup in postgres 15 like
+      * update git epository
+        * `git checkout master`
+        * `git pull`
+      * stop docker-compose if it's running
+        * `docker-compose stop`
+      * delete old zammad postgre container and volume (data is lost! get sure your backups are in place!)
+        * `docker container rm zammad-docker-compose_zammad-postgresql_1`
+        * `docker volume rm zammad-docker-compose_postgresql-data`
+      * recreate zammads postgres volume
+        * `docker volume create zammad-docker-compose_postgresql-data`
+      * start a temporary restore container (adjust username & password vars if needed)
+        * `docker run -it --rm --name postgres-restore -v zammad-docker-compose_zammad-backup:/var/tmp/zammad:ro -v zammad-docker-compose_postgresql-data:/var/lib/postgresql/data -e POSTGRES_USER=zammad -e POSTGRES_PASSWORD=zammad postgres:15.0-alpine`
+      * in a second bash shell run:
+        * show available backups
+          * `docker exec -it postgres-restore bash -c "ls -al /var/tmp/zammad/"`
+        * create zammad_production db
+          * `docker exec -it postgres-restore bash -c "psql -U zammad --command='CREATE DATABASE zammad_production'"`
+        * restore old data with adjusted filename you got from the ls command above
+          * `docker exec -it postgres-restore bash -c "gunzip -kc /var/tmp/zammad/!!!ENTER_PSQL_FILE_NAME_FROM_COMMAND_ABOVE!!!_zammad_db.psql.gz | psql -U zammad" -d zammad_production`
+        * stop the restore container
+          * `docker stop postgres-restore`
+      * in your first bash shell
+        * `docker-compose up`
+
+### From =< 4.0.0 to 5.0.0
+
+Memchached config changed. If you use the old env vars `MEMCACHED_HOST` & `MEMCACHED_PORT` adapt to `MEMCACHE_SERVERS`.
+Redis is a dependency for the Websocket server now.
+
+### From =< 3.6.0-65
+
+To be able to run Zammad container with an unprivileged user we had to change the port Nginx uses from 80 to 8080, so Zammad needs to be accessed via <http://localhost:8080> instead of <http://localhost> now!
+
+This change will also affect you, if you use a reverse proxy, like Traefik or Haproxy, in front of Zammad as your reverse proxy configuration needs to be adapted to point to port 8080 now.
+
 ### From =< 3.3.0-12
 
 We've updated the Elasticsearch image from 5.6 to 7.6.
@@ -69,14 +122,3 @@ CREATE USER zammad;
 ALTER USER zammad WITH PASSWORD 'zammad';
 ALTER USER zammad WITH SUPERUSER CREATEDB;
 ```
-
-### From =< 3.6.0-65
-
-To be able to run Zammad container with an unprivileged user we had to change the port Nginx uses from 80 to 8080, so Zammad needs to be accessed via <http://localhost:8080> instead of <http://localhost> now!
-
-This change will also affect you, if you use a reverse proxy, like Traefik or Haproxy, in front of Zammad as your reverse proxy configuration needs to be adapted to point to port 8080 now.
-
-### From =< 4.0.0 to 5.0.0
-
-Memchached config changed. If you use the old env vars `MEMCACHED_HOST` & `MEMCACHED_PORT` adapt to `MEMCACHE_SERVERS`.
-Redis is a dependency for the Websocket server now.
diff --git a/containers/zammad-elasticsearch/Dockerfile b/containers/zammad-elasticsearch/Dockerfile
deleted file mode 100644
index a4ea30c..0000000
--- a/containers/zammad-elasticsearch/Dockerfile
+++ /dev/null
@@ -1,17 +0,0 @@
-FROM docker.elastic.co/elasticsearch/elasticsearch:7.17.3
-ARG BUILD_DATE
-
-LABEL org.label-schema.build-date="$BUILD_DATE" \
-      org.label-schema.name="Zammad" \
-      org.label-schema.license="AGPL-3.0" \
-      org.label-schema.description="Docker container for Zammad - Elasticsearch" \
-      org.label-schema.url="https://zammad.org" \
-      org.label-schema.vcs-url="https://github.com/zammad/zammad" \
-      org.label-schema.vcs-type="Git" \
-      org.label-schema.vendor="Zammad" \
-      org.label-schema.schema-version="5.2.1" \
-      org.label-schema.docker.cmd="sysctl -w vm.max_map_count=262144;docker-compose up"
-
-SHELL ["/bin/bash", "-e", "-o", "pipefail", "-c"]
-
-RUN /usr/share/elasticsearch/bin/elasticsearch-plugin install --batch ingest-attachment
diff --git a/containers/zammad-postgresql/Dockerfile b/containers/zammad-postgresql/Dockerfile
deleted file mode 100644
index 1d29c2c..0000000
--- a/containers/zammad-postgresql/Dockerfile
+++ /dev/null
@@ -1,20 +0,0 @@
-FROM postgres:15.0-alpine
-
-ARG BUILD_DATE
-
-LABEL org.label-schema.build-date="$BUILD_DATE" \
-      org.label-schema.name="Zammad" \
-      org.label-schema.license="AGPL-3.0" \
-      org.label-schema.description="Docker container for Zammad - Postgresql" \
-      org.label-schema.url="https://zammad.org" \
-      org.label-schema.vcs-url="https://github.com/zammad/zammad" \
-      org.label-schema.vcs-type="Git" \
-      org.label-schema.vendor="Zammad" \
-      org.label-schema.schema-version="5.2.1" \
-      org.label-schema.docker.cmd="sysctl -w vm.max_map_count=262144;docker-compose up"
-
-SHELL ["/bin/bash", "-e", "-o", "pipefail", "-c"]
-
-# copy backup script
-COPY containers/zammad-postgresql/backup.sh /usr/local/bin/
-RUN chmod +x /usr/local/bin/backup.sh
diff --git a/containers/zammad/Dockerfile b/containers/zammad/Dockerfile
index 5d3702e..7c898d2 100644
--- a/containers/zammad/Dockerfile
+++ b/containers/zammad/Dockerfile
@@ -37,7 +37,7 @@ LABEL org.label-schema.build-date="$BUILD_DATE" \
       org.label-schema.vcs-url="https://github.com/zammad/zammad" \
       org.label-schema.vcs-type="Git" \
       org.label-schema.vendor="Zammad" \
-      org.label-schema.schema-version="5.2.1" \
+      org.label-schema.schema-version="5.2.3" \
       org.label-schema.docker.cmd="sysctl -w vm.max_map_count=262144;docker-compose up"
 
 ENV GIT_BRANCH stable
diff --git a/docker-compose.override-local.yml b/docker-compose.override-local.yml
index f10bab4..375b373 100644
--- a/docker-compose.override-local.yml
+++ b/docker-compose.override-local.yml
@@ -3,21 +3,12 @@ version: '3'
 
 services:
 
-  zammad-backup:
-    image: zammad-postgresql-local
-
-  zammad-elasticsearch:
-    image: zammad-elasticsearch-local
-
   zammad-init:
     image: zammad-local
 
   zammad-nginx:
     image: zammad-local
 
-  zammad-postgresql:
-    image: zammad-postgresql-local
-
   zammad-railsserver:
     image: zammad-local
 
diff --git a/docker-compose.yml b/docker-compose.yml
index 1bb3692..0f9a897 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -14,19 +14,18 @@ services:
       - HOLD_DAYS=10
       - POSTGRESQL_USER=${POSTGRES_USER}
       - POSTGRESQL_PASSWORD=${POSTGRES_PASS}
-    image: ${IMAGE_REPO}:zammad-postgresql${VERSION}
+    image: postgres:15.0-alpine
     restart: ${RESTART}
     volumes:
       - zammad-backup:/var/tmp/zammad
-      - zammad-data:/opt/zammad
+      - zammad-data:/opt/zammad:ro
+      - ./scripts/backup.sh:/usr/local/bin/backup.sh:ro
 
   zammad-elasticsearch:
-    environment:
-      - discovery.type=single-node
-    image: ${IMAGE_REPO}:zammad-elasticsearch${VERSION}
+    image: bitnami/elasticsearch:8.5.0
     restart: ${RESTART}
     volumes:
-      - elasticsearch-data:/usr/share/elasticsearch/data
+      - elasticsearch-data:/bitnami/elasticsearch/data
 
   zammad-init:
     command: ["zammad-init"]
@@ -44,7 +43,7 @@ services:
 
   zammad-memcached:
     command: memcached -m 256M
-    image: memcached:1.6.10-alpine
+    image: memcached:1.6.17-alpine
     restart: ${RESTART}
 
   zammad-nginx:
@@ -62,7 +61,7 @@ services:
     environment:
       - POSTGRES_USER=${POSTGRES_USER}
       - POSTGRES_PASSWORD=${POSTGRES_PASS}
-    image: ${IMAGE_REPO}:zammad-postgresql${VERSION}
+    image: postgres:15.0-alpine
     restart: ${RESTART}
     volumes:
       - postgresql-data:/var/lib/postgresql/data
diff --git a/containers/zammad-postgresql/backup.sh b/scripts/backup.sh
similarity index 98%
rename from containers/zammad-postgresql/backup.sh
rename to scripts/backup.sh
index 6c570ee..3874ed6 100755
--- a/containers/zammad-postgresql/backup.sh
+++ b/scripts/backup.sh
@@ -34,6 +34,8 @@ function zammad_backup {
 
   #db backup
   pg_dump --dbname=postgresql://"${POSTGRESQL_USER}:${POSTGRESQL_PASSWORD}@${POSTGRESQL_HOST}:${POSTGRESQL_PORT}/${POSTGRESQL_DB}" | gzip > "${BACKUP_DIR}"/"${TIMESTAMP}"_zammad_db.psql.gz
+
+  echo "backup finished :)"
 }
 
 if [ "$1" = 'zammad-backup' ]; then