diff --git a/Dockerfile b/Dockerfile
index 4bf5c73c..a76496f7 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,5 @@
 FROM python:3.12-slim
+ARG NIGHTLY=0
 
 # Install packages needed to run your application (not build deps):
 # We need to recreate the /usr/share/man/man{1..8} directories first because
@@ -39,6 +40,12 @@ RUN set -ex \
     && apt-get purge -y --auto-remove -o APT::AutoRemove::RecommendsImportant=false $BUILD_DEPS \
     && rm -rf /var/lib/apt/lists/*
 
+RUN if [ "$NIGHTLY" = "1" ]; then \
+    curl -s https://releases.wagtail.org/nightly/latest.json | \
+    grep -o 'https://[^"]*' | \
+    xargs python3.12 -m pip install; \
+fi
+
 RUN mkdir /code/
 WORKDIR /code/
 ADD . /code/
diff --git a/heroku.yml b/heroku.yml
index b18fd649..1a259f1b 100644
--- a/heroku.yml
+++ b/heroku.yml
@@ -2,6 +2,8 @@ build:
   docker:
     web:
       dockerfile: Dockerfile
+  config:
+    NIGHTLY: 1
 
 release:
   image: web