diff --git a/.env.example b/.env.example
index 01d5756..87bd29e 100644
--- a/.env.example
+++ b/.env.example
@@ -1,3 +1,6 @@
+# Docker image to use for Send
+DOCKER_SEND_IMAGE=mozilla/send:latest
+
 # Host to expose Send on
 HOST=send.example.org
 
diff --git a/README.md b/README.md
index cb22357..f56d17e 100644
--- a/README.md
+++ b/README.md
@@ -19,6 +19,9 @@ See [docker-compose.yaml](./docker-compose.yaml).
 
 ### Example .env
 ```bash
+# Docker image to use for Send
+DOCKER_SEND_IMAGE=mozilla/send:latest
+
 # Host to expose Send on
 HOST=send.example.org
 
diff --git a/docker-compose.yaml b/docker-compose.yaml
index 842c08d..dde7702 100644
--- a/docker-compose.yaml
+++ b/docker-compose.yaml
@@ -28,7 +28,7 @@ services:
       - proxy-vhost:/etc/nginx/vhost.d
       - proxy-html:/usr/share/nginx/html
   send:
-    image: 'mozilla/send:latest'
+    image: '${DOCKER_SEND_IMAGE}'
     restart: always
     ports:
       - '1234:1234'