diff --git a/.docker/Dockerfile b/.docker/Dockerfile
index 4ae35a4..ea5a00f 100644
--- a/.docker/Dockerfile
+++ b/.docker/Dockerfile
@@ -1,4 +1,4 @@
-FROM php:7.1-fpm
+FROM php:8.5-fpm@sha256:cf0ad713a40b4728a5de6055633285a92e3fe84dddfddd5218098b203f8395b5
 
 COPY . .
 WORKDIR .