diff --git a/Dockerfile b/Dockerfile
index 48a418a..e89719e 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,7 +1,8 @@
 FROM node:carbon-alpine@sha256:eec36f96b5a0d4685e5a9eebee19bfae37232d4fa93ca4fc218107676c6b1326
 LABEL maintainer "Tim Brust <tim.brust@sinnerschrader.com>"
 
-ENV REFRESHED_AT 2018-07-08
+ARG REFRESHED_AT
+ENV REFRESHED_AT $REFRESHED_AT
 
 RUN apk add --no-cache \
   git \
diff --git a/hooks/build b/hooks/build
new file mode 100644
index 0000000..6b61d1c
--- /dev/null
+++ b/hooks/build
@@ -0,0 +1,2 @@
+#!/bin/bash
+docker build --build-arg REFRESHED_AT="$(date +%Y-%m-%d)" -f "$DOCKERFILE_PATH" -t "$IMAGE_NAME" .
diff --git a/renovate.json b/renovate.json
index f45d8f1..243d9ce 100644
--- a/renovate.json
+++ b/renovate.json
@@ -1,5 +1,6 @@
 {
   "extends": [
-    "config:base"
+    "config:base",
+    "default:automergeDigest"
   ]
 }