diff --git a/tools/docker/core/Dockerfile b/tools/docker/core/Dockerfile
index 044202bda..6942ca489 100644
--- a/tools/docker/core/Dockerfile
+++ b/tools/docker/core/Dockerfile
@@ -1,4 +1,4 @@
-FROM python:2-alpine3.9
+FROM python:2-alpine3.10
 
 ARG CERTBOT_VERSION
 ENV CERTBOT_VERSION=${CERTBOT_VERSION}