diff --git a/Dockerfile b/Dockerfile
index 279aae1..9643549 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM alpine:3.21.2@sha256:56fa17d2a7e7f168a043a2712e63aed1f8543aeafdcee47c58dcffe38ed51099 AS bin
+FROM alpine:3.21.3@sha256:a8560b36e8b8210634f77d9f7f9efd7ffa463e380b75e2e74aff4511df3ef88c AS bin
 
 ARG TARGETOS
 ARG TARGETARCH
@@ -19,7 +19,7 @@ RUN set -ex \
     esac \
   && cp /dist/kured_${TARGETOS}_${TARGETARCH}${SUFFIX}/kured /dist/kured;
 
-FROM alpine:3.21.2@sha256:56fa17d2a7e7f168a043a2712e63aed1f8543aeafdcee47c58dcffe38ed51099
+FROM alpine:3.21.3@sha256:a8560b36e8b8210634f77d9f7f9efd7ffa463e380b75e2e74aff4511df3ef88c
 RUN apk update --no-cache && apk upgrade --no-cache && apk add --no-cache ca-certificates tzdata
 COPY --from=bin /dist/kured /usr/bin/kured
 ENTRYPOINT ["/usr/bin/kured"]