diff --git a/Dockerfile b/Dockerfile
index fcfc2a3..2c78989 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -6,6 +6,7 @@ ENV ZULIP_VERSION="master" DATA_DIR="/data"
 ADD entrypoint.sh /sbin/entrypoint.sh
 
 RUN apt-get -q update && \
+    apt-get -q dist-upgrade -y && \
     apt-get install -y git && \
     mkdir -p "$DATA_DIR" /root/zulip && \
     git clone https://github.com/zulip/zulip.git /root/zulip && \