diff --git a/Dockerfile_auth b/Dockerfile_auth
index 1287c10..02adca3 100644
--- a/Dockerfile_auth
+++ b/Dockerfile_auth
@@ -5,7 +5,6 @@ RUN mkdir /dislocker
 
 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 e00c09a..fad88ae 100644
--- a/Dockerfile_bot
+++ b/Dockerfile_bot
@@ -5,7 +5,6 @@ RUN mkdir /dislocker
 
 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