diff --git a/docker-compose.override.yml b/docker-compose.override.yml
new file mode 100644
index 0000000..38cc387
--- /dev/null
+++ b/docker-compose.override.yml
@@ -0,0 +1,15 @@
+## Local development overrides.
+## Compose loads this automatically alongside docker-compose.yml, so `docker compose up`
+## live-mounts the source files for hot-reload. Portainer (Git stack) only deploys
+## docker-compose.yml and ignores this file, using the code baked into the image instead.
+version: '3.8'
+
+services:
+  web:
+    volumes:
+      - ./web:/app/web
+      - ./download-overpass.py:/app/download-overpass.py
+      - ./diff-highways.py:/app/diff-highways.py
+      - ./shp-to-geojson.py:/app/shp-to-geojson.py
+      - ./convert-addresses.py:/app/convert-addresses.py
+      - ./compare-addresses.py:/app/compare-addresses.py
diff --git a/docker-compose.yml b/docker-compose.yml
index 709a8d5..99be3fd 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -8,12 +8,6 @@ services:
       - "5000:5000"
     volumes:
       - ./data:/data
-      - ./web:/app/web
-      - ./download-overpass.py:/app/download-overpass.py
-      - ./diff-highways.py:/app/diff-highways.py
-      - ./shp-to-geojson.py:/app/shp-to-geojson.py
-      - ./convert-addresses.py:/app/convert-addresses.py
-      - ./compare-addresses.py:/app/compare-addresses.py
     env_file:
       - stack.env
     environment: