diff --git a/abra.sh b/abra.sh
index f813c59..942cc15 100644
--- a/abra.sh
+++ b/abra.sh
@@ -11,6 +11,7 @@ export MATRIX_CONFIG_VERSION=v1
 export WEKAN_CONFIG_VERSION=v3
 export VIKUNJA_CONFIG_VERSION=v1
 export MONITORING_CONFIG_VERSION=v1
+export DB_ENTRYPOINT_VERSION=v1
 
 customize() {
     if [ -z "$1" ]
diff --git a/compose.yml b/compose.yml
index 438ab45..5367be1 100644
--- a/compose.yml
+++ b/compose.yml
@@ -73,7 +73,7 @@ services:
         - "traefik.http.middlewares.${STACK_NAME}-redirect.headers.SSLHost=${DOMAIN}"
         - "traefik.http.middlewares.${STACK_NAME}-frameOptions.headers.customFrameOptionsValue=SAMEORIGIN"
         - "traefik.http.middlewares.${STACK_NAME}-frameOptions.headers.contentSecurityPolicy=frame-ancestors ${X_FRAME_OPTIONS_ALLOW_FROM}"
-        - "coop-cloud.${STACK_NAME}.version=3.3.0+2023.8.5"
+        - "coop-cloud.${STACK_NAME}.version=3.3.1+2023.8.5"
         - "coop-cloud.${STACK_NAME}.timeout=${TIMEOUT:-120}"
 
   worker:
@@ -109,9 +109,15 @@ services:
     environment: *env
 
   db:
-    image: postgres:12.17-alpine
+    image: postgres:15.5
     secrets:
       - db_password
+    configs:
+      - source: db_entrypoint
+        target: /docker-entrypoint.sh
+        mode: 0555
+    entrypoint:
+      /docker-entrypoint.sh
     volumes:
       - database:/var/lib/postgresql/data
     networks:
@@ -202,3 +208,7 @@ configs:
     name: ${STACK_NAME}_system_tenant_${SYSTEM_TENANT_VERSION}
     file: system_tenant.yaml.tmpl
     template_driver: golang
+  db_entrypoint:
+    name: ${STACK_NAME}_db_entrypoint_${DB_ENTRYPOINT_VERSION}
+    file: entrypoint.postgres.sh.tmpl
+    template_driver: golang
diff --git a/entrypoint.postgres.sh.tmpl b/entrypoint.postgres.sh.tmpl
new file mode 100644
index 0000000..03ff1c5
--- /dev/null
+++ b/entrypoint.postgres.sh.tmpl
@@ -0,0 +1,45 @@
+#!/bin/bash
+
+set -e
+
+MIGRATION_MARKER=$PGDATA/migration_in_progress
+OLDDATA=$PGDATA/old_data
+NEWDATA=$PGDATA/new_data
+
+if [ -e $MIGRATION_MARKER ]; then
+  echo "FATAL: migration was started but did not complete in a previous run. manual recovery necessary"
+  exit 1
+fi
+
+if [ -f $PGDATA/PG_VERSION ]; then
+  DATA_VERSION=$(cat $PGDATA/PG_VERSION)
+
+  if [ -n "$DATA_VERSION" -a "$PG_MAJOR" != "$DATA_VERSION" ]; then
+    echo "postgres data version $DATA_VERSION found, but need $PG_MAJOR. Starting migration"
+    echo "Installing postgres $DATA_VERSION"
+    sed -i "s/$/ $DATA_VERSION/" /etc/apt/sources.list.d/pgdg.list
+    apt-get update && apt-get install -y --no-install-recommends \
+      postgresql-$DATA_VERSION \
+      && rm -rf /var/lib/apt/lists/*
+    echo "shuffling around"
+    chown -R postgres:postgres $PGDATA
+    gosu postgres mkdir $OLDDATA $NEWDATA
+    chmod 700 $OLDDATA $NEWDATA
+    mv $PGDATA/* $OLDDATA/ || true
+    touch $MIGRATION_MARKER
+    echo "running initdb"
+    # abuse entrypoint script for initdb by making server error out
+    gosu postgres bash -c "export PGDATA=$NEWDATA ; /usr/local/bin/docker-entrypoint.sh --invalid-arg || true"
+    echo "running pg_upgrade"
+    cd /tmp
+    gosu postgres pg_upgrade --link -b /usr/lib/postgresql/$DATA_VERSION/bin -d $OLDDATA -D $NEWDATA -U $POSTGRES_USER
+    cp $OLDDATA/pg_hba.conf $NEWDATA/
+    mv $NEWDATA/* $PGDATA
+    rm -rf $OLDDATA
+    rmdir $NEWDATA
+    rm $MIGRATION_MARKER
+    echo "migration complete"
+  fi
+fi
+
+/usr/local/bin/docker-entrypoint.sh postgres