diff --git a/Dockerfile b/Dockerfile
index 49f96b2..05e8554 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM php:8.3-apache
+FROM php:8.3-apache@sha256:239772b092f6f21965834817c8419152251263859e563a5625d3f4b7309f17ba
 LABEL maintainer="Julien Cabillot <dockerimages@cabillot.eu>"
 
 # hadolint ignore=DL3008,DL3015,SC3009