diff --git a/seafile-server/Dockerfile b/seafile-server/Dockerfile
index 7887e9b..05db489 100644
--- a/seafile-server/Dockerfile
+++ b/seafile-server/Dockerfile
@@ -29,6 +29,7 @@ ENV SEAFILE_VERSION=11.0.4
 
 RUN apt-get update && \
 DEBIAN_FRONTEND=noninteractive apt-get install -y \
+netcat-openbsd \
 socat \
 cron \
 tzdata \