diff --git a/Dockerfile b/Dockerfile
index f7d7907..7152802 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -16,9 +16,11 @@
 RUN sed -i 's@archive.ubuntu.com@ftp.jaist.ac.jp/pub/Linux@g' /etc/apt/sources.list
 
  
-RUN apt-get update && \
+RUN apt-get autoclean -y && \
+    apt-get clean all -y && \
+    apt-get update && \
     apt-get upgrade -y && \
-    apt-get install --no-install-recommends -y \
+    apt-get install -y \
     build-essential \
     dkms \
     openssh-server && \
@@ -35,6 +37,7 @@
     apt-get upgrade -y && \
     apt-get install --no-install-recommends -y \
     python3-pip \
+    python3-testresources \
     gedit \
     ros-noetic-rosserial \
     ros-noetic-rosserial-arduino \
@@ -74,7 +77,9 @@
 COPY src /home/ubuntu/catkin_ws/src
 
 
-RUN pip3 install pymodbus && \
+RUN pip3 install --upgrade --no-cache-dir pip && \
+    pip3 install --no-cache-dir \
+    pymodbus && \
     cd /home/ubuntu/catkin_ws/src/ZLAC8015D_python && \
     python3 setup.py install && \
     usermod -a -G dialout $USER