diff --git a/Dockerfile-alpine.template b/Dockerfile-alpine.template
index 4d05f14d..38e00615 100644
--- a/Dockerfile-alpine.template
+++ b/Dockerfile-alpine.template
@@ -1,4 +1,4 @@
-FROM php:%%PHP_VERSION%%-%%VARIANT%%3.14
+FROM php:%%PHP_VERSION%%-%%VARIANT%%3.15
 
 # entrypoint.sh and cron.sh dependencies
 RUN set -ex; \