diff --git a/crond/Dockerfile b/crond/Dockerfile
index 9b39fa10145f6f586e0e7f4c1e5bd6dd4ba12caf..b542461079321729d8884e8c0723730338d7d768 100644
--- a/crond/Dockerfile
+++ b/crond/Dockerfile
@@ -1,4 +1,4 @@
-FROM alpine:3.20 as downloader
+FROM alpine:3.21 as downloader
 ARG URL=https://github.com/aptible/supercronic/releases/download/v0.2.32/supercronic-linux-amd64
 ARG SHA1SUM=7da26ce6ab48d75e97f7204554afe7c80779d4e0
 WORKDIR /tmp
@@ -8,7 +8,7 @@ RUN wget -q $URL && \
     install -m 755 supercronic-linux-amd64 /usr/local/bin/supercronic && \
     touch /crontab
 
-FROM alpine:3.20
+FROM alpine:3.21
 COPY --from=downloader /usr/local/bin/supercronic /usr/local/bin/supercronic
 COPY --from=downloader /crontab /crontab
 WORKDIR /tmp