diff --git a/Dockerfile b/Dockerfile
index dac10f7c..a219e550 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -11,7 +11,7 @@ RUN go build -o /Jomon -ldflags "-s -w"
 
 ## run
 
-FROM alpine:3.20.3
+FROM alpine:3.21.0
 ENV TZ Asia/Tokyo
 
 RUN apk --update --no-cache add tzdata \