diff --git a/docker/docker-compose.yml b/docker/docker-compose.yml
index dc162c2b9..82f421c8b 100644
--- a/docker/docker-compose.yml
+++ b/docker/docker-compose.yml
@@ -3,25 +3,25 @@
 ---
 services:
   backend:
-    image: ghcr.io/hedgedoc/hedgedoc/backend:develop
+    image: ghcr.io/hedgedoc/hedgedoc/backend:develop@sha256:01eb029fb57fa8a142c0ea315e689f385a3137d80ce5aa40cfe9c183f1cb23c9
     volumes:
       - $PWD/.env:/usr/src/app/backend/.env
       - hedgedoc_uploads:/usr/src/app/backend/uploads
 
   frontend:
-    image: ghcr.io/hedgedoc/hedgedoc/frontend:develop
+    image: ghcr.io/hedgedoc/hedgedoc/frontend:develop@sha256:8c7e57e87a1fe3fa78ea1576a7834c9831b70d1c43826dfa06f1f79d5c7c918c
     environment:
       HD_BASE_URL: "${HD_BASE_URL}"
 
   db:
-    image: postgres:15
+    image: postgres:15@sha256:9e3b538a581247a22f8e452d1b797373bb3e1bfae6e3273e9c49b637e080c797
     environment:
       POSTGRES_USER: "${HD_DATABASE_USER}"
       POSTGRES_PASSWORD: "${HD_DATABASE_PASS}"
       POSTGRES_DB: "${HD_DATABASE_NAME}"
 
   proxy:
-    image: caddy:latest
+    image: caddy:latest@sha256:20bbfcf569bdcbca76a8df356877600d12331fef823c3e6ad6faa192d5668304
     restart: unless-stopped
     environment:
       HD_BASE_URL: "${HD_BASE_URL}"