diff --git a/Dockerfile b/Dockerfile
index ce1f9ab..2e012ed 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,11 +1,11 @@
 # Erster Schritt: App bauen
-FROM alpine:3.19 AS build
+FROM alpine:3.21 AS build
 RUN apk add --no-cache gcc musl-dev
 COPY deployment.c .
 RUN gcc -o deployment deployment.c
 
 # Finales Image: Nur die Binary mitnehmen
-FROM alpine:3.19
+FROM alpine:3.21
 
 # Neuer User wegen Sicherheit
 RUN adduser -D appuser