diff --git a/Dockerfile b/Dockerfile
index 68ec6188..ac90a548 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,8 @@
-FROM registry.nulo.in/sutty/rails:3.13.6-2.7.5
+ARG RUBY_VERSION=2.7
+ARG RUBY_PATCH=6
+ARG ALPINE_VERSION=3.13.10
+ARG BASE_IMAGE=registry.nulo.in/sutty/rails
+FROM ${BASE_IMAGE}:${ALPINE_VERSION}-${RUBY_VERSION}.${RUBY_PATCH}
 ARG PANDOC_VERSION=2.18
 ENV RAILS_ENV production