diff --git a/Dockerfile b/Dockerfile
index 8dc4ff9..20eaae1 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM php:8.3-cli-alpine AS base
+FROM php:8.4-cli-alpine3.21 AS base
 
 RUN apk add --no-cache \
     curl \
@@ -13,11 +13,11 @@ FROM base AS deps
 COPY --from=composer:2 /usr/bin/composer /usr/bin/composer
 COPY composer.json composer.lock* ./
 RUN composer install \
-        --no-dev \
-        --no-scripts \
-        --no-interaction \
-        --optimize-autoloader \
-        --prefer-dist
+    --no-dev \
+    --no-scripts \
+    --no-interaction \
+    --optimize-autoloader \
+    --prefer-dist
 
 # ── build stage (generate optimised classmap with source present) ──────────────
 FROM deps AS build