diff --git a/Dockerfile b/Dockerfile
index 6e9dbc9..e5920cd 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM alpine:3.21
+FROM alpine:3.23
 
 RUN apk add --no-cache tini ca-certificates dovecot dovecot-ldap dovecot-lmtpd dovecot-pigeonhole-plugin dovecot-pop3d python3 ssmtp && \
     addgroup -g 1000 mailuser0 && adduser -D -u 1000 -G mailuser0 mailuser0