diff --git a/Dockerfile b/Dockerfile
index bd24085..280b1bc 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,9 +1,15 @@
 FROM python:3.8-slim-buster
 
 COPY . /app
-RUN apt-get update ; apt-get install -y graphviz
+
+RUN sed -i 's/deb.debian.org/archive.debian.org/g' /etc/apt/sources.list && \
+    sed -i '/security.debian.org/d' /etc/apt/sources.list && \
+    apt-get update && \
+    apt-get install -y --no-install-recommends graphviz && \
+    rm -rf /var/lib/apt/lists/*
+
 RUN mkdir -p /storage
 RUN pip install /app
 ENV PMAPPER_STORAGE /storage
 
-CMD sh
+CMD ["sh"]