diff --git a/.cloudbees/testing/Dockerfile-test b/.cloudbees/testing/Dockerfile-test
index f9ae36e..61ca6f2 100644
--- a/.cloudbees/testing/Dockerfile-test
+++ b/.cloudbees/testing/Dockerfile-test
@@ -1,4 +1,4 @@
-FROM alpine:3.21 AS build
+FROM alpine:3.23 AS build
 RUN echo test > /test-file
 
 FROM docker.io/mgoltzsche/podman:5.4.0-minimal AS podman