diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 98f42a5..8808216 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -7,9 +7,9 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        version: [8.0, 8.1, 8.2]
+        php-version: [8.3, 8.4]
     steps:
       - uses: actions/checkout@v2
         with:
           ref: ${{ github.event.release.target_commitish }}
-      - run: docker build . --build-arg PHP_VERSION=${{ matrix.version }}
+      - run: docker build . --build-arg PHP_VERSION=${{ matrix.php-version }} --build-arg ALPINE_VERSION=${{ vars.ALPINE_VERSION }} -t my-app:${{ matrix.php-version }}
diff --git a/Dockerfile b/Dockerfile
index a712992..e397b2d 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,5 +1,12 @@
 ARG PHP_VERSION
-FROM php:${PHP_VERSION}-alpine3.21 as standards-runtime
+ARG ALPINE_VERSION
+
+FROM busybox:latest AS validator
+ARG ALPINE_VERSION
+RUN : "${ALPINE_VERSION:?ALPINE_VERSION build argument is required}" && touch /validated
+
+FROM php:${PHP_VERSION}-alpine${ALPINE_VERSION} AS standards-runtime
+COPY --from=validator /validated /tmp/.validated
 
 # Install system dependencies
 RUN apk update && apk add --no-cache \