diff --git a/Dockerfile b/Dockerfile
index 5bec7d5..1c7b7cb 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM docker.io/alpine:3.16 AS builder
+FROM docker.io/alpine:3.17 AS builder
 
 ENV VERSION=20.0.1
 ENV SHA256_SUM=0ab04636827d54915f54456a260d37489e6c4df494615cf00c05e96d281a91e6
@@ -8,7 +8,9 @@ RUN echo "$SHA256_SUM  keycloak-$VERSION.tar.gz" | sha256sum -c - || exit 1
 RUN mkdir -p /keycloak
 RUN tar xvf keycloak-$VERSION.tar.gz -C /keycloak --strip 1
 
-FROM docker.io/thallian/alpine-s6:3.16
+FROM docker.io/thallian/alpine-s6:3.17
+
+ENV JAVA_OPTS_APPEND="-Djava.net.preferIPv4Stack=false -Djava.net.preferIPv6Addresses=true"
 
 RUN addgroup -g 2222 keycloak
 RUN adduser -h /home/keycloak -u 2222 -D -G keycloak keycloak