diff --git a/devel/microsoft-gsl/Makefile b/devel/microsoft-gsl/Makefile
index c8b41898905c..83f6b9946f29 100644
--- a/devel/microsoft-gsl/Makefile
+++ b/devel/microsoft-gsl/Makefile
@@ -1,23 +1,23 @@
 PORTNAME=	microsoft-gsl
 DISTVERSIONPREFIX=	v
-DISTVERSION=	4.2.0
+DISTVERSION=	4.2.1
 CATEGORIES=	devel
 
 MAINTAINER=	henry.hu.sh@gmail.com
 COMMENT=	Guidelines Support Library
 WWW=		https://github.com/microsoft/GSL
 
 LICENSE=	MIT
 LICENSE_FILE=	${WRKSRC}/LICENSE
 
 USES=		cmake
 
 USE_GITHUB=	yes
 GH_ACCOUNT=	microsoft
 GH_PROJECT=	GSL
 
 CMAKE_OFF=	GSL_TEST
 
 NO_ARCH=	yes
 
 .include <bsd.port.mk>
diff --git a/devel/microsoft-gsl/distinfo b/devel/microsoft-gsl/distinfo
index 2a97ab6ae16b..a87b3ece7646 100644
--- a/devel/microsoft-gsl/distinfo
+++ b/devel/microsoft-gsl/distinfo
@@ -1,3 +1,3 @@
-TIMESTAMP = 1740975942
-SHA256 (microsoft-GSL-v4.2.0_GH0.tar.gz) = 2c717545a073649126cb99ebd493fa2ae23120077968795d2c69cbab821e4ac6
-SIZE (microsoft-GSL-v4.2.0_GH0.tar.gz) = 62240
+TIMESTAMP = 1765573041
+SHA256 (microsoft-GSL-v4.2.1_GH0.tar.gz) = d959f1cb8bbb9c94f033ae5db60eaf5f416be1baa744493c32585adca066fe1f
+SIZE (microsoft-GSL-v4.2.1_GH0.tar.gz) = 62226