diff --git a/Dockerfile b/Dockerfile
index 6959979..93c64ee 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -3,6 +3,7 @@ FROM ubuntu:16.04
 RUN apt-get update && apt-get install -y --no-install-recommends \
     autoconf \
     build-essential \
+    ca-certificates \
     capnproto \
     cppcheck \
     clang \