diff --git a/Dockerfile b/Dockerfile
index 6b657e4f6a3e1486f0c23cce486c81529211cefa..77c46ba77e4a057aad3b4416bc734eba6a43a007 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -3,7 +3,7 @@ FROM debian:stable-slim
 RUN apt-get -q update && \
     echo prometheus-blackbox-exporter prometheus-blackbox-exporter/want_cap_net_raw boolean true \
        | debconf-set-selections && \
-    env DEBIAN_FRONTEND=noninteractive apt-get -y install prometheus-blackbox-exporter && \
+    env DEBIAN_FRONTEND=noninteractive apt-get -y install prometheus-blackbox-exporter ca-certificates && \
     apt-get clean && \
     rm -fr /var/lib/apt/lists/*