diff --git a/Dockerfile b/Dockerfile
index 3be5ac4..dbdbbd8 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,6 +1,10 @@
 FROM "alpine:latest"
 LABEL maintainer="Julien Cabillot <dockerimages@cabillot.eu>"
 
-RUN apk add --no-cache unrar
+RUN apk add --no-cache unrar && \
+    rm -rf /usr/lib/ruby/gems/*/cache/* \
+        /var/cache/apk/* \
+        /tmp/* \
+        /var/tmp/*
 
 ENTRYPOINT [ "/bin/sh", "-c", "cd /data && /usr/bin/unrar" ]