diff --git a/Dockerfile b/Dockerfile
index b556804..082fce3 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
 FROM debian:buster-slim
-RUN apt-get update -y && apt-get install -y libssl-dev && rm -rf /var/lib/apt/lists/*
+RUN apt-get update -y && apt-get install -y libssl-dev ca-certificates && rm -rf /var/lib/apt/lists/*
 COPY ./weasyl-watcher /bin/weasyl-watcher
 CMD ["/bin/weasyl-watcher"]