diff --git a/Dockerfile b/Dockerfile
index 3150b40..1e1295c 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -14,7 +14,8 @@ RUN if [ $enable_mecab -ne 0 ]; then apt-get update \
   && ./bin/install-mecab-ipadic-neologd -n -y \
   && rm -rf /opt/mecab-ipadic-neologd \
   && echo "dicdir = /usr/lib/x86_64-linux-gnu/mecab/dic/mecab-ipadic-neologd/" > /etc/mecabrc \
-  && apt-get purge git make curl xz-utils file -y; fi
+  && apt-get purge git make curl xz-utils file -y \
+	&& apt-get autoremove -y && apt-get clean -y && rm -rf /var/lib/apt/lists/* /root/.gnupg /tmp/library-scripts; fi
 
 COPY . /ai