diff --git a/Dockerfile b/Dockerfile
index c65a3c5..ebd756f 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -15,8 +15,12 @@ RUN bundle exec jekyll build
 # === Serve-Phase: node.js backend + ImageMagick ===
 FROM node:20-alpine
 
-# ImageMagick fuer Thumbnails, Build-Tools fuer sqlite3 native bindings
-RUN apk add --no-cache imagemagick python3 make g++ build-base sqlite-dev
+# ImageMagick + Format-Delegates (JPEG/PNG/WebP), Build-Tools fuer sqlite3 native bindings
+RUN apk add --no-cache imagemagick \
+    libjpeg-turbo libjpeg-turbo-dev \
+    libpng libpng-dev \
+    libwebp libwebp-dev \
+    python3 make g++ build-base sqlite-dev
 
 WORKDIR /app
 COPY package*.json ./