diff --git a/math/libqalculate/Makefile b/math/libqalculate/Makefile
index 1c37add066c7..4fec5172abce 100644
--- a/math/libqalculate/Makefile
+++ b/math/libqalculate/Makefile
@@ -1,10 +1,10 @@
 PORTNAME=	libqalculate
-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 (backend library)
+COMMENT=	Multi-purpose desktop calculator (library and CLI)
 WWW=		https://qalculate.github.io/
 
 LICENSE=	GPLv2+
@@ -15,9 +15,12 @@ LIB_DEPENDS=	libicuuc.so:devel/icu \
 		libgmp.so:math/gmp \
 		libmpfr.so:math/mpfr
 
-USES=		compiler:c++14-lang gettext gmake gnome iconv libtool \
+USES=		compiler:c++17-lang gettext gmake gnome iconv libtool \
 		localbase ncurses pathfix pkgconfig readline
-USE_GNOME=	intltool libxml2
+# 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=	libxml2
 USE_LDCONFIG=	yes
 
 GNU_CONFIGURE=	yes
diff --git a/math/libqalculate/distinfo b/math/libqalculate/distinfo
index 6d6a27ed8c6e..884e90c1110f 100644
--- a/math/libqalculate/distinfo
+++ b/math/libqalculate/distinfo
@@ -1,3 +1,3 @@
-TIMESTAMP = 1763447653
-SHA256 (libqalculate-5.8.2.tar.gz) = 7136f3c929e88e7cea0fa66427bc541dcc99c7ecbe0d67cb256bfc922d2127d1
-SIZE (libqalculate-5.8.2.tar.gz) = 2683875
+TIMESTAMP = 1768982673
+SHA256 (libqalculate-5.9.0.tar.gz) = 94d734b9303b3b68df61e4255f2eddeee346b66ec4b6e134f19e1a3cc3ff4a09
+SIZE (libqalculate-5.9.0.tar.gz) = 3526223
diff --git a/math/libqalculate/pkg-plist b/math/libqalculate/pkg-plist
index 156a42ef22cf..55f8c9d76883 100644
--- a/math/libqalculate/pkg-plist
+++ b/math/libqalculate/pkg-plist
@@ -16,7 +16,7 @@ include/libqalculate/util.h
 lib/libqalculate.a
 lib/libqalculate.so
 lib/libqalculate.so.23
-lib/libqalculate.so.23.3.9
+lib/libqalculate.so.23.3.10
 libdata/pkgconfig/libqalculate.pc
 share/man/man1/qalc.1.gz
 %%NLS%%share/locale/ca/LC_MESSAGES/libqalculate.mo