diff --git a/environment/dev/app/Dockerfile b/environment/dev/app/Dockerfile
index 56b6ba5e..5bd1eb78 100644
--- a/environment/dev/app/Dockerfile
+++ b/environment/dev/app/Dockerfile
@@ -1,3 +1,4 @@
+# renovate: datasource=docker depName=php
 ARG PHP_VERSION=8.3.6
 ARG PHP_MODULE_NAME=php${PHP_VERSION}
 # https://github.com/nginx/unit/tags
diff --git a/environment/prod/app/Dockerfile b/environment/prod/app/Dockerfile
index 86218c25..01b6838e 100644
--- a/environment/prod/app/Dockerfile
+++ b/environment/prod/app/Dockerfile
@@ -1,3 +1,4 @@
+# renovate: datasource=docker depName=php
 ARG PHP_VERSION=8.3.6
 ARG PHP_MODULE_NAME=php${PHP_VERSION}
 # https://github.com/nginx/unit/tags