diff --git a/sleep/Dockerfile b/sleep/Dockerfile
index 8ca8db2fa93460e3f233467cb108183edf8fcad3..0656e597402af84dad6b07bc55f0a85ed43791ad 100644
--- a/sleep/Dockerfile
+++ b/sleep/Dockerfile
@@ -1,4 +1,4 @@
-FROM alpine:3.20
+FROM alpine:3.21
 COPY --chown=root:root entrypoint /usr/local/bin/entrypoint
 USER nobody
 ENTRYPOINT ["entrypoint"]