diff --git a/Dockerfile b/Dockerfile
index 0354e97..f91ed3f 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -2,7 +2,8 @@ FROM node:latest
 
 ENV HOSTNAME=${HOSTNAME:-haraka}
 
-RUN apt-get update && apt-get upgrade -y && apt-get install -y supervisor certbot && \
+RUN echo "deb http://ftp.debian.org/debian jessie-backports main" >> /etc/apt/sources.list && \
+    apt-get update && apt-get upgrade -y && apt-get install -y supervisor certbot && \
     rm -rf /var/lib/apt/lists/* && \
     mkdir /var/log/supervisord && \
     groupadd -r haraka && \