diff --git a/math/libtommath/Makefile b/math/libtommath/Makefile
index 1e721627e196..14cb5f597382 100644
--- a/math/libtommath/Makefile
+++ b/math/libtommath/Makefile
@@ -1,48 +1,21 @@
 PORTNAME=	libtommath
-DISTVERSION=	1.2.1
+DISTVERSION=	1.3.0
 CATEGORIES=	math
 MASTER_SITES=	https://github.com/libtom/libtommath/releases/download/v${DISTVERSION}/
 DISTNAME=	ltm-${DISTVERSION}
 
 MAINTAINER=	gahr@FreeBSD.org
 COMMENT=	Comprehensive, modular, and portable mathematical routines
 WWW=		https://libtom.net/
 
 LICENSE=	UNLICENSE
 LICENSE_FILE=	${WRKSRC}/LICENSE
 
-USES=		gmake libtool:build pathfix tar:xz
-
+USES=		cmake:testing tar:xz
+CMAKE_ARGS=	-DBUILD_TESTING:BOOL=ON \
+		-DCMAKE_INSTALL_PKGCONFIGDIR:STRING=libdata/pkgconfig
 WRKSRC=		${WRKDIR}/${PORTNAME}-${DISTVERSION}
-USE_LDCONFIG=	yes
-
-MAKEFILE=	makefile.shared
-MAKE_ENV+=	IGNORE_SPEED=yes
-ALL_TARGET=	default
-CFLAGS+=	-fPIC
-PORTDOCS=	*
-
-PLIST_FILES=	include/tommath.h \
-		lib/libtommath.a \
-		lib/libtommath.so \
-		lib/libtommath.so.${DISTVERSION:R:R} \
-		lib/libtommath.so.${DISTVERSION} \
-		libdata/pkgconfig/libtommath.pc
 
-OPTIONS_DEFINE=	DOCS
-
-post-patch:
-	@${REINPLACE_CMD} -e 's|$$(LIBPATH)/pkgconfig|${PREFIX}/libdata/pkgconfig|' \
-		${WRKSRC}/${MAKEFILE}
-
-post-install:
-	@${MKDIR} ${STAGEDIR}${DOCSDIR}
-	${INSTALL_DATA} ${WRKSRC}/doc/bn.pdf ${STAGEDIR}${DOCSDIR}
-	@${STRIP_CMD} ${STAGEDIR}${PREFIX}/lib/libtommath.so.${DISTVERSION}
-
-do-test:
-	(cd ${WRKSRC}; \
-	 ${SETENV} ${MAKE_ENV} ${MAKE_CMD} -f makefile mtest/mtest test; \
-	 ./mtest/mtest | ./test)
+USE_LDCONFIG=	yes
 
 .include <bsd.port.mk>
diff --git a/math/libtommath/distinfo b/math/libtommath/distinfo
index 6cc0e5e7f56c..bcbacb38c3fd 100644
--- a/math/libtommath/distinfo
+++ b/math/libtommath/distinfo
@@ -1,3 +1,3 @@
-TIMESTAMP = 1696845190
-SHA256 (ltm-1.2.1.tar.xz) = 986025d7b374276fee2e30e99f3649e4ac0db8a02257a37ee10eae72abed0d1f
-SIZE (ltm-1.2.1.tar.xz) = 635728
+TIMESTAMP = 1712044712
+SHA256 (ltm-1.3.0.tar.xz) = 296272d93435991308eb73607600c034b558807a07e829e751142e65ccfa9d08
+SIZE (ltm-1.3.0.tar.xz) = 642776