diff --git a/Dockerfile b/Dockerfile
index 5135949..2f5e21a 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,9 +1,9 @@
-FROM certbot/certbot:v0.33.1
+FROM certbot/certbot:v0.37.2
 
 # install docker-in-docker
-ARG DOCKERVERSION=18.03.1-ce
-RUN apk add curl
-RUN curl -fsSLO https://download.docker.com/linux/static/stable/x86_64/docker-${DOCKERVERSION}.tgz && \
+ARG DOCKERVERSION=19.03.1
+RUN apk add --no-cache curl=7.65.1-r0; \
+    curl -fsSLO https://download.docker.com/linux/static/stable/x86_64/docker-${DOCKERVERSION}.tgz && \
     tar xzvf docker-${DOCKERVERSION}.tgz --strip 1 -C /usr/local/bin docker/docker && \
     rm docker-${DOCKERVERSION}.tgz