diff --git a/math/qalculate-gtk/Makefile b/math/qalculate-gtk/Makefile
index d7703ddf5249..d10de80c6838 100644
--- a/math/qalculate-gtk/Makefile
+++ b/math/qalculate-gtk/Makefile
@@ -1,35 +1,38 @@
 PORTNAME=	qalculate-gtk
-PORTVERSION=	5.8.2
+PORTVERSION=	5.9.0
 CATEGORIES=	math
 MASTER_SITES=	https://github.com/Qalculate/${PORTNAME}/releases/download/v${PORTVERSION}/
 
 MAINTAINER=	jhale@FreeBSD.org
 COMMENT=	Multi-purpose desktop calculator (GTK 3 frontend)
 WWW=		https://qalculate.github.io/
 
 LICENSE=	GPLv2+
 LICENSE_FILE=	${WRKSRC}/COPYING
 
 LIB_DEPENDS=	libqalculate.so:math/libqalculate \
 		libharfbuzz.so:print/harfbuzz
 RUN_DEPENDS=	gnuplot:math/gnuplot
 
-USES=		compiler:c++11-lang gettext gmake gnome \
-		libtool:build localbase pkgconfig
-USE_GNOME=	cairo gdkpixbuf gtk30 intltool libxml2
+USES=		compiler:c++17-lang gettext gmake gnome \
+		libtool localbase pkgconfig
+# Project does not set a c++ dialect, but it's better to not leave this
+# undefined and left up to the whims of the compiler.
+USE_CXXSTD=	c++17
+USE_GNOME=	cairo gdkpixbuf gtk30 libxml2
 
 GNU_CONFIGURE=	yes
 
 OPTIONS_DEFINE=		NLS WEBKIT
 OPTIONS_DEFAULT=	WEBKIT
 OPTIONS_SUB=		yes
 
 WEBKIT_DESC=		Use WebKitGTK for display of the user manual
 WEBKIT_LIB_DEPENDS=	libsoup-2.4.so:devel/libsoup \
 			libwebkit2gtk-4.0.so:www/webkit2-gtk@40
 WEBKIT_CONFIGURE_ON=	--with-webkitgtk=4.0
 
 post-patch-NLS-off:
 	@${REINPLACE_CMD} -e '/^SUBDIRS =/s|po ||g' ${WRKSRC}/Makefile.in
 
 .include <bsd.port.mk>
diff --git a/math/qalculate-gtk/distinfo b/math/qalculate-gtk/distinfo
index 6e7c55cd01b0..84c11aa858d0 100644
--- a/math/qalculate-gtk/distinfo
+++ b/math/qalculate-gtk/distinfo
@@ -1,3 +1,3 @@
-TIMESTAMP = 1763448406
-SHA256 (qalculate-gtk-5.8.2.tar.gz) = 20a3d4c4c63f53236cdaa79234e8d51e4deb5b647aff32bc310b920261ce68a3
-SIZE (qalculate-gtk-5.8.2.tar.gz) = 3095670
+TIMESTAMP = 1768988356
+SHA256 (qalculate-gtk-5.9.0.tar.gz) = 39cd0bc5abe26edfc04a3064d4412d5af9f7197eafa0762a18a0cb6996f1021b
+SIZE (qalculate-gtk-5.9.0.tar.gz) = 3619981