diff --git a/Dockerfile b/Dockerfile
index 4f891374..fd9eb1d1 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM python:3.10.12-slim-buster
+FROM python:3.10.13-slim-bookworm
 
 RUN apt-get -y update && apt-get -y upgrade && \
     apt-get install --no-install-recommends -y wait-for-it gcc libpq-dev libc-dev postgresql-client redis-tools
diff --git a/Dockerfile.debug b/Dockerfile.debug
index 84fd41bb..c8e7e165 100644
--- a/Dockerfile.debug
+++ b/Dockerfile.debug
@@ -1,4 +1,4 @@
-FROM python:3.10.12-slim-buster
+FROM python:3.10.13-slim-bookworm
 
 RUN apt-get -y update && apt-get -y upgrade && \
     apt-get install --no-install-recommends -y wait-for-it gcc libpq-dev libc-dev postgresql-client redis-tools
diff --git a/Dockerfile.dev b/Dockerfile.dev
index cd358fa6..5b5dc381 100644
--- a/Dockerfile.dev
+++ b/Dockerfile.dev
@@ -1,4 +1,4 @@
-FROM python:3.10.12-slim-buster
+FROM python:3.10.13-slim-bookworm
 
 RUN apt-get -y update && apt-get -y upgrade && \
     apt-get install --no-install-recommends -y wait-for-it gcc libpq-dev libc-dev postgresql-client redis-tools
diff --git a/Dockerfile.test b/Dockerfile.test
index 7a98a17f..8e098835 100644
--- a/Dockerfile.test
+++ b/Dockerfile.test
@@ -1,4 +1,4 @@
-FROM python:3.10.12-slim-buster
+FROM python:3.10.13-slim-bookworm
 
 RUN apt-get -y update && apt-get -y upgrade && \
     apt-get install --no-install-recommends -y wait-for-it vim gcc libpq-dev libc-dev postgresql-client redis-tools curl
diff --git a/dc.dev.yml b/dc.dev.yml
index 43952850..6b195b65 100644
--- a/dc.dev.yml
+++ b/dc.dev.yml
@@ -36,7 +36,7 @@ services:
         stdin_open: true
         tty: true
     postgres:
-        image: postgres:13
+        image: postgres:15
         env_file: database.env
         networks:
             - postgres
diff --git a/dc.external.yml b/dc.external.yml
index 200490e0..de7240f8 100644
--- a/dc.external.yml
+++ b/dc.external.yml
@@ -39,7 +39,7 @@ services:
             - postgres
             - redis
     postgres:
-        image: postgres:13
+        image: postgres:15
         environment:
             - POSTGRES_USER=openslides
             - POSTGRES_PASSWORD=openslides
diff --git a/dc.test.yml b/dc.test.yml
index 388dd50c..f3cb3d0e 100644
--- a/dc.test.yml
+++ b/dc.test.yml
@@ -22,7 +22,7 @@ services:
         ports:
             - "5679:5678"
     postgres:
-        image: postgres:13
+        image: postgres:15
         env_file: database.env
         networks:
             - postgres
diff --git a/docker-compose.yml b/docker-compose.yml
index 19f949ef..39d205ae 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -28,7 +28,7 @@ services:
         secrets:
             - postgres_password
     postgres:
-        image: postgres:13
+        image: postgres:15
         env_file: database.env
         networks:
             - postgres
diff --git a/requirements/requirements-testing.txt b/requirements/requirements-testing.txt
index bb983565..7af61b23 100644
--- a/requirements/requirements-testing.txt
+++ b/requirements/requirements-testing.txt
@@ -5,9 +5,9 @@ pytest==7.4.3
 pytest-cov==4.1.0
 
 # linting & formatting
-black==23.11.0
+black==23.12.0
 autoflake==2.2.1
-isort==5.12.0
+isort==5.13.1
 flake8==6.1.0
 mypy==1.7.1
 
diff --git a/system_tests/Dockerfile b/system_tests/Dockerfile
index 437e5a21..b584b37f 100644
--- a/system_tests/Dockerfile
+++ b/system_tests/Dockerfile
@@ -1,4 +1,4 @@
-FROM python:3.10.3-slim-buster
+FROM python:3.10.13-slim-bookworm
 
 RUN apt-get -y update && apt-get -y upgrade && \
     apt-get install --no-install-recommends -y wait-for-it gcc libpq-dev libc-dev postgresql-client redis-tools