diff --git a/Dockerfile b/Dockerfile
index f9cee6b..d66bf19 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,6 +1,6 @@
 FROM python:alpine
 
-RUN apk add --no-cache gcc g++ musl-dev python3-dev libffi-dev rust openssl-dev cargo pkgconfig 
+RUN apk add --no-cache gcc g++ musl-dev python3-dev libffi-dev rust openssl-dev cargo pkgconfig
 
 RUN pip install --no-cache-dir pdm
 
@@ -11,7 +11,7 @@ COPY ./utils ./utils
 COPY ./pyproject.toml ./pdm.lock ./miuitask.py ./docker_start.sh ./
 
 RUN pdm install --prod && \
-    echo "0 4 * * * cd /srv && pdm run /srv/miuitask.py" > /var/spool/cron/crontabs/root && \
+    echo '0 4 * * * /bin/sh -c "sleep $((RANDOM % 1800 + 1)); cd /srv && pdm run /srv/miuitask.py"' > /var/spool/cron/crontabs/root && \
     chmod +x docker_start.sh
 
 VOLUME ["/srv/data", "/srv/logs"]