diff --git a/Dockerfile b/Dockerfile
index 0c10536..e788df8 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -8,7 +8,7 @@ FROM tailscale/tailscale:latest AS tailscale
 FROM alpine:3.20
 
 # Basis-Pakete
-RUN apk add update \
+RUN apk add --update \
       iptables \
       iproute2 \
       ca-certificates \