diff --git a/Dockerfile b/Dockerfile
index 5dfe442c..73a052d5 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,7 +1,8 @@
 # add amd64 platform to support Mac M1
 FROM --platform=linux/amd64 shivammathur/node:latest-amd64
 
-ARG PHP_VERSION=8.2
+# todo update this to 8.2 once shivammathur/node supports that
+ARG PHP_VERSION=8.1
 
 WORKDIR /var/www/html
 
diff --git a/INTERNAL.md b/INTERNAL.md
new file mode 100644
index 00000000..4b3297dd
--- /dev/null
+++ b/INTERNAL.md
@@ -0,0 +1,8 @@
+# Internal development notes
+
+## Updating the docker image used by the GH action
+
+1. Login in to Docker Hub: `docker login -u archtechx -p`
+2. Build the image (probably shut down docker-compose containers first): `docker-compose build --no-cache`
+3. Tag a new image: `docker tag tenancy_test archtechx/tenancy:latest`
+4. Push the image: `docker push archtechx/tenancy:latest`