Merge pull request #4607 from mailcow/netfilter-alpine3.16

Netfilter base image update

data/Dockerfiles/netfilter/Dockerfile

@@ -1,4 +1,4 @@
-FROM alpine:3.15
+FROM alpine:3.16
 LABEL maintainer "Andre Peters <andre.peters@servercow.de>"
 
 ENV XTABLES_LIBDIR /usr/lib/xtables

docker-compose.yml

@@ -422,7 +422,7 @@ services:
             - acme
 
     netfilter-mailcow:
-      image: mailcow/netfilter:1.47
+      image: mailcow/netfilter:1.48
       stop_grace_period: 30s
       depends_on:
         - dovecot-mailcow