diff --git a/Dockerfile b/Dockerfile
index baa80c6..be23f64 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM alpine:3.19
+FROM alpine:3.21
 
 RUN apk update && \
     apk add bash gawk cyrus-sasl cyrus-sasl-login cyrus-sasl-crammd5 mailx \