diff --git a/Dockerfile b/Dockerfile
index 6050141..d3eef9e 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,6 @@
 FROM nginx:alpine
+RUN apk add --no-cache tzdata
+ENV TZ=Asia/Tokyo
 COPY nginx.conf /etc/nginx/nginx.conf
 COPY conf.d/ /etc/nginx/conf.d/
 COPY entrypoint.sh /entrypoint.sh