diff --git a/.woodpecker/build.yml b/.woodpecker/build.yml
index db5d3b4..47b4cc3 100644
--- a/.woodpecker/build.yml
+++ b/.woodpecker/build.yml
@@ -13,7 +13,7 @@ pipeline:
       tags:
         - ${PHP_VERSION}
       build_args:
-        - PHP_VERSION=${PHP_VERSION}
+        - PHP_IMAGE=php:${PHP_VERSION}-fpm-alpine
       username: deploy
       password:
         from_secret: deploy_password
diff --git a/Dockerfile b/Dockerfile
index f0207de..dd27c78 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,7 +1,9 @@
+ARG PHP_IMAGE=php:7.4-fpm-alpine
 FROM caddy:builder-alpine as caddy 
+ARG PHP_IMAGE
 RUN xcaddy build --with github.com/baldinof/caddy-supervisor@v0.6.0
-ARG PHP_VERSION=7.4
-FROM php:$PHP_VERSION-fpm-alpine
+RUN echo "image tag is ${PHP_IMAGE}"
+FROM $PHP_IMAGE
 COPY --from=caddy /usr/bin/caddy /usr/bin
 COPY Caddyfile /usr/local/etc/caddy/Caddyfile
 COPY php.ini /usr/local/etc/php/conf.d