diff --git a/Dockerfile b/Dockerfile
index a336e58..170b42f 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,7 +1,9 @@
 FROM debian:latest AS builder
 
-RUN cat /etc/issue
-
+RUN \
+  apt-get --yes update &&\
+  apt-get --yes install ca-certificates &&\
+  apt-get clean && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
 
 FROM scratch