diff --git a/Dockerfile b/Dockerfile
index f6b3c81..c0fa166 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -5,4 +5,6 @@ RUN apk add --no-cache \
     weasyprint
 
 # Plugin installieren
-RUN pip install --no-cache-dir mkdocs-to-pdf
+RUN apk add --no-cache --virtual .build-deps build-base python3-dev libffi-dev
+&& pip install --no-cache-dir mkdocs-to-pdf
+&& apk del .build-deps