diff --git a/Dockerfile b/Dockerfile
index 6862ea1..051ba1f 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -4,7 +4,7 @@ MAINTAINER Adam Dodman <"adam.dodman@gmx.com">
 
 COPY . /quotedb/
 
-RUN apk add --no-cache python3 py3-pip tini gcc python3-dev libc-dev libffi-dev \
+RUN apk add --no-cache python3 py3-pip tini gcc python3-dev libc-dev ca-certificates libffi-dev \
  && pip3 install -r /quotedb/requirements.txt \
  && ln -s /quotedb/adduser.py /usr/bin/quote-adduser