diff --git a/Dockerfile_auth b/Dockerfile_auth
index 51ddb85..1287c10 100644
--- a/Dockerfile_auth
+++ b/Dockerfile_auth
@@ -1,10 +1,11 @@
-FROM python:3.12
+FROM python:3.12-alpine
 USER root
 
 RUN mkdir /dislocker
 
-ENV TZ JST-9
-ENV TERM xterm
+RUN apk --no-cache add tzdata
+RUN cp /usr/share/zoneinfo/Asia/Tokyo /etc/localtime
+RUN apk del tzdata
 
 RUN pip install --upgrade pip
 RUN pip install --upgrade setuptools
diff --git a/Dockerfile_bot b/Dockerfile_bot
index ac45332..e00c09a 100644
--- a/Dockerfile_bot
+++ b/Dockerfile_bot
@@ -1,10 +1,11 @@
-FROM python:3.12
+FROM python:3.12-alpine
 USER root
 
 RUN mkdir /dislocker
 
-ENV TZ JST-9
-ENV TERM xterm
+RUN apk --no-cache add tzdata
+RUN cp /usr/share/zoneinfo/Asia/Tokyo /etc/localtime
+RUN apk del tzdata
 
 RUN pip install --upgrade pip
 RUN pip install --upgrade setuptools