diff --git a/audio/rsgain/Makefile b/audio/rsgain/Makefile
index a3dc5a1ff982..4cc8293607e0 100644
--- a/audio/rsgain/Makefile
+++ b/audio/rsgain/Makefile
@@ -1,5 +1,5 @@
 PORTNAME=	rsgain
-DISTVERSION=	3.5.3
+DISTVERSION=	3.6
 DISTVERSIONSUFFIX=	-source
 CATEGORIES=	audio
 MASTER_SITES=	https://github.com/complexlogic/rsgain/releases/download/v${DISTVERSION}/
@@ -12,14 +12,14 @@ LICENSE=	BSD2CLAUSE
 LICENSE_FILE=	${WRKSRC}/LICENSE
 
 LIB_DEPENDS=	libtag.so:audio/taglib \
-		libfmt.so:devel/libfmt \
 		libinih.so:devel/inih \
 		libavcodec.so:multimedia/ffmpeg
 
-USES=		cmake compiler:c++2b-lang ebur128 pkgconfig tar:xz
+USES=		cmake compiler:c++23-lang ebur128 pkgconfig tar:xz
 
 CMAKE_ARGS=	-DMAXPROGBARWIDTH=80
-CMAKE_ON=	INSTALL_MANPAGE
+CMAKE_ON=	INSTALL_MANPAGE \
+		USE_STD_FORMAT
 WRKSRC=		${WRKDIR}/${PORTNAME}-${DISTVERSION}
 
 OPTIONS_DEFINE=		DOCS UNICODE
diff --git a/audio/rsgain/distinfo b/audio/rsgain/distinfo
index 0efb8e171388..6970fd53fea1 100644
--- a/audio/rsgain/distinfo
+++ b/audio/rsgain/distinfo
@@ -1,3 +1,3 @@
-TIMESTAMP = 1731787792
-SHA256 (rsgain-3.5.3-source.tar.xz) = 3626e7adaee475be3c72c78cd1e8c6ffa38062daf48c8e8a8591c16022ff6bf4
-SIZE (rsgain-3.5.3-source.tar.xz) = 51720
+TIMESTAMP = 1739054801
+SHA256 (rsgain-3.6-source.tar.xz) = 26d46f1240a83366e82cbc9121a467fc1dcc977c7adfb4e15c99ead6b3d07ec8
+SIZE (rsgain-3.6-source.tar.xz) = 52168