diff --git a/Dockerfile b/Dockerfile
index 3a0073e..ef6977e 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -21,6 +21,7 @@ RUN echo "deb http://ftp.debian.org/debian jessie-backports main contrib non-fre
 	      git \
 	      nginx-light \
 	      dnsutils \
+	      ca-certificates \
 && curl -sL https://deb.nodesource.com/setup_6.x | bash - \
 && apt-get -y install -y nodejs --no-install-recommends \
 && gem install bundler \