diff --git a/net/libarms/Makefile b/net/libarms/Makefile
index 17d94baa1f8b..2dcadff5b656 100644
--- a/net/libarms/Makefile
+++ b/net/libarms/Makefile
@@ -1,25 +1,28 @@
 PORTNAME=	libarms
 PORTVERSION=	5.01
 PORTREVISION=	2
 CATEGORIES=	net devel
 MASTER_SITES=	https://dev.smf.jp/dl/ \
 		http://dev.smf.jp/dl/
 
 MAINTAINER=	shigeru@iij.ad.jp
 COMMENT=	SMFv2/ARMS client library for C
 WWW=		https://dev.smf.jp/libarms/
 
 LICENSE=	BSD2CLAUSE
 LICENSE_FILE=	${WRKSRC}/COPYING
 
+DEPRECATED=	Obsolete version and not updated in a decade
+EXPIRATION_DATE=2025-07-31
+
 LIB_DEPENDS=	libexpat.so:textproc/expat2
 
 USES=		gmake libtool localbase ssl
 GNU_CONFIGURE=	yes
 USE_LDCONFIG=	yes
 
 post-configure:
 	@${REINPLACE_CMD} 's|$${datarootdir}/doc/$${PACKAGE_TARNAME}|${DOCSDIR}|' \
 		${WRKSRC}/Makefile
 
 .include <bsd.port.mk>