diff --git a/math/cadabra2/Makefile b/math/cadabra2/Makefile
index e8de464c19be..614ee6e1bba0 100644
--- a/math/cadabra2/Makefile
+++ b/math/cadabra2/Makefile
@@ -1,58 +1,57 @@
 PORTNAME=	cadabra2
-DISTVERSION=	2.5.4
-PORTREVISION=	2
+DISTVERSION=	2.5.6
 CATEGORIES=	math
 
 MAINTAINER=	yuri@FreeBSD.org
 COMMENT=	Computer algebra system for solving field theory problems
 WWW=		https://cadabra.science/
 
 LICENSE=	LGPL3
 LICENSE_FILE=	${WRKSRC}/doc/license.txt
 
 BROKEN_FreeBSD_15=	compilation fails with clang-17, see https://github.com/kpeeters/cadabra2/issues/285
 
 BUILD_DEPENDS=	${LOCALBASE}/include/websocketpp/client.hpp:devel/websocketpp
 LIB_DEPENDS=	${PY_BOOST} \
 		libboost_system.so:devel/boost-libs \
 		libfontconfig.so:x11-fonts/fontconfig \
 		libharfbuzz.so:print/harfbuzz \
 		libpcrecpp.so:devel/pcre \
 		libjsoncpp.so:devel/jsoncpp \
 		libgmp.so:math/gmp \
 		libuuid.so:misc/e2fsprogs-libuuid
 RUN_DEPENDS=	${PYTHON_SITELIBDIR}/sympy/__init__.py:math/py-sympy@${PY_FLAVOR} \
 		${PYTHON_SITELIBDIR}/matplotlib/__init__.py:math/py-matplotlib@${PY_FLAVOR}
 
-USES=		compiler:c++14-lang cmake:noninja dos2unix gettext-runtime gnome localbase:ldflags pkgconfig python sqlite tex # USES=python picks random python versions
+USES=		compiler:c++17-lang cmake:noninja dos2unix gettext-runtime gnome localbase:ldflags pkgconfig python sqlite tex # USES=python picks random python versions
 USE_GNOME=	glib20 glibmm libsigc++20
 USE_TEX=	base latex texhash
 
 USE_GITHUB=	yes
 GH_ACCOUNT=	kpeeters
 GH_TAGNAME=	95ca296 # 2.5.2 + fixes for the microtex library
 GH_TUPLE=	kpeeters:MicroTeX:d68cf35:microtex/submodules/microtex
 
 DOS2UNIX_FILES=	cmake/version.cmake
 
 CMAKE_ON=	ENABLE_SYSTEM_JSONCPP USE_PYTHON_3 # OFF doesn't work, still links to python3: https://github.com/kpeeters/cadabra2/issues/76
 CMAKE_OFF=	ENABLE_MATHEMATICA
 CXXFLAGS+=	-I${LOCALBASE}/include/jsoncpp
 LDFLAGS+=	-ljsoncpp
 
 PLIST_SUB=	_PY_SONAME=${_PY_SONAME}
 
 OPTIONS_DEFINE=		GUI
 OPTIONS_DEFAULT=	GUI
 OPTIONS_SUB=		yes
 
 GUI_USES=		desktop-file-utils
 GUI_USE=		GNOME=gtkmm30,gdkpixbuf2
 GUI_CMAKE_BOOL=		ENABLE_FRONTEND
 
 _PY_SONAME=	${PYTHON_EXT_SUFFIX}
 
 post-extract: # unbundle
 	@${RM} -r ${WRKSRC}/libs/jsoncpp ${WRKSRC}/libs/websocketpp
 
 .include <bsd.port.mk>
diff --git a/math/cadabra2/distinfo b/math/cadabra2/distinfo
index 6b65cd3e709f..936a04eb7e76 100644
--- a/math/cadabra2/distinfo
+++ b/math/cadabra2/distinfo
@@ -1,5 +1,5 @@
-TIMESTAMP = 1723440675
-SHA256 (kpeeters-cadabra2-2.5.4-95ca296_GH0.tar.gz) = 14e10284d82dbd98145baa9b33e2bec280dc71f0df4f70abb8d865ad908b562e
-SIZE (kpeeters-cadabra2-2.5.4-95ca296_GH0.tar.gz) = 32459069
+TIMESTAMP = 1728535443
+SHA256 (kpeeters-cadabra2-2.5.6-95ca296_GH0.tar.gz) = 14e10284d82dbd98145baa9b33e2bec280dc71f0df4f70abb8d865ad908b562e
+SIZE (kpeeters-cadabra2-2.5.6-95ca296_GH0.tar.gz) = 32459069
 SHA256 (kpeeters-MicroTeX-d68cf35_GH0.tar.gz) = 6b2a54dd28544c7dd3d18f44a9fb5b837cebdb86d913c0e570191777bf50b24c
 SIZE (kpeeters-MicroTeX-d68cf35_GH0.tar.gz) = 5492579