diff --git a/eventarc/generic/Dockerfile b/eventarc/generic/Dockerfile
index 80846818ad..6ab90e8262 100644
--- a/eventarc/generic/Dockerfile
+++ b/eventarc/generic/Dockerfile
@@ -16,7 +16,7 @@
 
 # Use the official PHP image.
 # https://hub.docker.com/_/php
-FROM php:8.4-apache
+FROM php:8.5-apache
 
 # Configure PHP for Cloud Run.
 # Precompile PHP code with opcache.