diff --git a/docker/Dockerfile b/docker/Dockerfile
index c7e74189..9d5c16af 100644
--- a/docker/Dockerfile
+++ b/docker/Dockerfile
@@ -1,5 +1,5 @@
 # FROM php:7.3-alpine
-FROM alpine:3.11
+FROM alpine:3.15
 
 RUN apk --no-cache upgrade
 RUN apk add --no-cache apache2 \