diff --git a/math/obake/Makefile b/math/obake/Makefile
index af31bc9f55a9..6603cc137f90 100644
--- a/math/obake/Makefile
+++ b/math/obake/Makefile
@@ -1,45 +1,45 @@
 PORTNAME=	obake
 DISTVERSIONPREFIX=	v
 DISTVERSION=	0.7.0-24
 DISTVERSIONSUFFIX=	-gb8cc71c
 PORTREVISION=	2
 CATEGORIES=	math
 
 PATCH_SITES=	https://github.com/${GH_ACCOUNT}/${GH_PROJECT}/commit/
 PATCHFILES+=	1a53966f5ce8ca5542d3612c780ea4b69be34de2.patch:-p1 \
 		dadf4ce2aba713522d1949a16ffbf0fa5d6e6298.patch:-p1 \
 		9310de2cb5cc4c85b54e7e90aa6cd88664380346.patch:-p1 \
 		57da8d5f2d0c50e857979ba74434893b0b392382.patch:-p1 \
 		494df04bd7608bb666efde776241370cb84c96bb.patch:-p1 # adding fmt9 compatibility, see https://github.com/bluescarni/obake/pull/145/commits
 
 MAINTAINER=	yuri@FreeBSD.org
 COMMENT=	C++ library for the symbolic manipulation of sparse polynomials & co
 WWW=		https://bluescarni.github.io/obake/
 
 LICENSE=	MPL20
 LICENSE_FILE=	${WRKSRC}/LICENSE
 
 LIB_DEPENDS=	libabsl_base.so:devel/abseil \
 		libboost_serialization.so:devel/boost-libs \
 		libfmt.so:devel/libfmt \
 		libgmp.so:math/gmp \
 		libmp++.so:math/mppp \
 		libmpc.so:math/mpc \
 		libmpfr.so:math/mpfr \
 		libtbb.so:devel/onetbb
 
-USES=		cmake:testing compiler:c++17-lang # need compiler:c++20-lang
+USES=		cmake:testing compiler:c++20-lang
 USE_LDCONFIG=	yes
 
 USE_GITHUB=	yes
 GH_ACCOUNT=	bluescarni
 
 CXXFLAGS+=	-DBOOST_STACKTRACE_GNU_SOURCE_NOT_REQUIRED
 
 CMAKE_TESTING_ON=	OBAKE_BUILD_TESTS
 
 post-install:
 	# remove patch artefacts
 	@${FIND} ${STAGEDIR}${PREFIX}/include/obake -name "*.orig" -delete
 
 .include <bsd.port.mk>