diff --git a/Dockerfile b/Dockerfile
index 7e48b617..267d103f 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,6 +1,6 @@
 ARG RUBY_VERSION=2.7
-ARG RUBY_PATCH=6
-ARG ALPINE_VERSION=3.13.10
+ARG RUBY_PATCH=8
+ARG ALPINE_VERSION=3.14.10
 ARG BASE_IMAGE=registry.nulo.in/sutty/rails
 FROM ${BASE_IMAGE}:${ALPINE_VERSION}-${RUBY_VERSION}.${RUBY_PATCH}
 ARG PANDOC_VERSION=2.18