diff --git a/Dockerfile b/Dockerfile
index cdcaf619..1d1c12b4 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -79,7 +79,7 @@ RUN cp -f /app/nginx.conf /etc/nginx/nginx.template.conf \
     && echo 'fs.inotify.max_user_watches=5242880' >> /etc/sysctl.conf \
     && echo 'fs.inotify.max_user_instances=5242880' >> /etc/sysctl.conf \
     && locale-gen zh_CN.UTF-8 \
-    && FRONTEND_VERSION=$(grep -oP "(?<=FRONTEND_VERSION\s*=\s*')[^']+" /app/version.py) \
+    && FRONTEND_VERSION=$(sed -n "s/^FRONTEND_VERSION\s*=\s*'\([^']*\)'/\1/p" /app/version.py) \
     && curl -sL "https://github.com/jxxghp/MoviePilot-Frontend/releases/download/${FRONTEND_VERSION}/dist.zip" | busybox unzip -d / - \
     && mv /dist /public \
     && curl -sL "https://github.com/jxxghp/MoviePilot-Plugins/archive/refs/heads/main.zip" | busybox unzip -d /tmp - \