diff --git a/src/Dockerfile b/src/Dockerfile
index 5e441a4..24d480a 100644
--- a/src/Dockerfile
+++ b/src/Dockerfile
@@ -4,7 +4,7 @@ RUN /usr/local/openresty/luajit/bin/luarocks install lua-resty-http
 RUN /usr/local/openresty/luajit/bin/luarocks install lua-resty-cookie
 RUN /usr/local/openresty/luajit/bin/luarocks install lua-resty-iputils
 
-RUN apk add openssl
+RUN apk add openssl certbot
 RUN /usr/local/openresty/luajit/bin/luarocks install lua-resty-auto-ssl
 
 RUN mkdir /etc/resty-auto-ssl && chown -R nobody /etc/resty-auto-ssl