diff --git a/Dockerfile_auth b/Dockerfile_auth
index f2fbcc6..99cd4dd 100644
--- a/Dockerfile_auth
+++ b/Dockerfile_auth
@@ -3,16 +3,9 @@ USER root
 
 RUN mkdir /dislocker
 
-RUN apt-get update
-RUN apt-get -y install locales && \
-    localedef -f UTF-8 -i ja_JP ja_JP.UTF-8
-ENV LANG ja_JP.UTF-8
-ENV LANGUAGE ja_JP:ja
-ENV LC_ALL ja_JP.UTF-8
 ENV TZ JST-9
 ENV TERM xterm
 
-RUN apt-get install -y nano less
 RUN pip install --upgrade pip
 RUN pip install --upgrade setuptools
 
diff --git a/Dockerfile_bot b/Dockerfile_bot
index e07f1af..6e273a1 100644
--- a/Dockerfile_bot
+++ b/Dockerfile_bot
@@ -3,16 +3,9 @@ USER root
 
 RUN mkdir /dislocker
 
-RUN apt-get update
-RUN apt-get -y install locales && \
-    localedef -f UTF-8 -i ja_JP ja_JP.UTF-8
-ENV LANG ja_JP.UTF-8
-ENV LANGUAGE ja_JP:ja
-ENV LC_ALL ja_JP.UTF-8
 ENV TZ JST-9
 ENV TERM xterm
 
-RUN apt-get install -y nano less
 RUN pip install --upgrade pip
 RUN pip install --upgrade setuptools