diff --git a/Dockerfile b/Dockerfile
index 7b54bbf..3aee7ae 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM docker.io/library/alpine:3.15.3
+FROM docker.io/library/alpine:3.15.4
 
 RUN apk update && apk add certbot bind-tools