diff --git a/Dockerfile b/Dockerfile
index aa67925..0437885 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,5 +1,5 @@
 # sample dockerfile for testing call-docker-build.yaml
-FROM alpine:3.18.4
+FROM alpine:3.21.3
 
 RUN apk add --no-cache curl