diff --git a/Dockerfile b/Dockerfile
index bf290ad..8c23cbb 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,6 +1,9 @@
 FROM debian:buster
 
-RUN apt-get update && apt-get install -y python3 python3-requests cron
+RUN \
+    apt-get update && \
+    apt-get install -y python3 python3-requests cron && \
+    apt-get clean && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
 
 ADD files/main.py /main.py