diff --git a/filesystems/fswatch-mon/Makefile b/filesystems/fswatch-mon/Makefile
index 024b1176b393..2b913ae2a47a 100644
--- a/filesystems/fswatch-mon/Makefile
+++ b/filesystems/fswatch-mon/Makefile
@@ -1,30 +1,29 @@
 PORTNAME=	fswatch
-DISTVERSION=	1.13.0
-PORTREVISION=	3
+DISTVERSION=	1.20.1
 CATEGORIES=	filesystems sysutils
 MASTER_SITES=	https://github.com/emcrisostomo/${PORTNAME}/releases/download/${DISTVERSION}/
 PKGNAMESUFFIX=	-mon
 
 MAINTAINER=	enrico.m.crisostomo@gmail.com
 COMMENT=	Cross-platform file change monitor
 WWW=		https://github.com/emcrisostomo/fswatch
 
 LICENSE=	GPLv3
 LICENSE_FILE=	${WRKSRC}/COPYING
 
-USES=		compiler:c++11-lang libtool makeinfo
+USES=		compiler:c++17-lang libtool makeinfo
 USE_LDCONFIG=	yes
 
 CONFLICTS_INSTALL=	fswatch
 GNU_CONFIGURE=	yes
-GNU_CONFIGURE_MANPREFIX=${PREFIX}/share
 INFO=	fswatch
 INSTALL_TARGET=	install-strip
+LIBS=		-lpthread
 
 OPTIONS_DEFINE=	DOCS NLS
 OPTIONS_SUB=	yes
 
 NLS_USES=	gettext
 NLS_CONFIGURE_ENABLE=	nls
 
 .include <bsd.port.mk>
diff --git a/filesystems/fswatch-mon/distinfo b/filesystems/fswatch-mon/distinfo
index d761195bb2be..6eed2c348dd6 100644
--- a/filesystems/fswatch-mon/distinfo
+++ b/filesystems/fswatch-mon/distinfo
@@ -1,3 +1,3 @@
-TIMESTAMP = 1540284604
-SHA256 (fswatch-1.13.0.tar.gz) = 90bcf0e02fa586251aa3233cb805ca4087e81de2c5960150a0676cc42f8534bb
-SIZE (fswatch-1.13.0.tar.gz) = 819644
+TIMESTAMP = 1777830395
+SHA256 (fswatch-1.20.1.tar.gz) = 890c2d7c53f4e05726d891e6211e6700d5724d6a4d29055282bb849f6eaae227
+SIZE (fswatch-1.20.1.tar.gz) = 849573
diff --git a/filesystems/fswatch-mon/files/patch-libfswatch_src_libfswatch_c++_kqueue__monitor.cpp b/filesystems/fswatch-mon/files/patch-libfswatch_src_libfswatch_c++_kqueue__monitor.cpp
new file mode 100644
index 000000000000..2ce72f4bc63c
--- /dev/null
+++ b/filesystems/fswatch-mon/files/patch-libfswatch_src_libfswatch_c++_kqueue__monitor.cpp
@@ -0,0 +1,11 @@
+--- libfswatch/src/libfswatch/c++/kqueue_monitor.cpp.orig	2026-04-29 08:45:38 UTC
++++ libfswatch/src/libfswatch/c++/kqueue_monitor.cpp
+@@ -131,7 +131,7 @@ namespace fsw
+     nanoseconds *= 1000000000;
+ 
+     struct timespec ts{};
+-    ts.tv_sec = static_cast<__darwin_time_t>(seconds);
++    ts.tv_sec = static_cast<time_t>(seconds);
+     ts.tv_nsec = static_cast<long>(nanoseconds);
+ 
+     return ts;
diff --git a/filesystems/fswatch-mon/pkg-plist b/filesystems/fswatch-mon/pkg-plist
index 88bdd75d8212..b6bb6a73b4a8 100644
--- a/filesystems/fswatch-mon/pkg-plist
+++ b/filesystems/fswatch-mon/pkg-plist
@@ -1,47 +1,47 @@
 bin/fswatch
 include/libfswatch/c++/event.hpp
 include/libfswatch/c++/filter.hpp
 include/libfswatch/c++/kqueue_monitor.hpp
 include/libfswatch/c++/libfswatch_exception.hpp
-include/libfswatch/c++/libfswatch_map.hpp
-include/libfswatch/c++/libfswatch_set.hpp
 include/libfswatch/c++/monitor.hpp
 include/libfswatch/c++/monitor_factory.hpp
 include/libfswatch/c++/path_utils.hpp
 include/libfswatch/c++/poll_monitor.hpp
 include/libfswatch/c++/string_utils.hpp
 include/libfswatch/c/cevent.h
 include/libfswatch/c/cfilter.h
 include/libfswatch/c/cmonitor.h
 include/libfswatch/c/error.h
 include/libfswatch/c/libfswatch.h
 include/libfswatch/c/libfswatch_log.h
 include/libfswatch/c/libfswatch_types.h
 lib/libfswatch.a
 lib/libfswatch.so
-lib/libfswatch.so.11
-lib/libfswatch.so.11.0.0
-share/man/man7/fswatch.7.gz
+lib/libfswatch.so.14
+lib/libfswatch.so.14.0.0
+libdata/pkgconfig/libfswatch.pc
 %%NLS%%%%PORTDOCS%%%%DOCSDIR%%/ABOUT-NLS
 %%PORTDOCS%%%%DOCSDIR%%/AUTHORS
 %%PORTDOCS%%%%DOCSDIR%%/AUTHORS.libfswatch
 %%PORTDOCS%%%%DOCSDIR%%/CONTRIBUTING.md
 %%PORTDOCS%%%%DOCSDIR%%/COPYING
 %%PORTDOCS%%%%DOCSDIR%%/NEWS
 %%PORTDOCS%%%%DOCSDIR%%/NEWS.libfswatch
 %%PORTDOCS%%%%DOCSDIR%%/README.bsd
 %%PORTDOCS%%%%DOCSDIR%%/README.codestyle
 %%PORTDOCS%%%%DOCSDIR%%/README.freebsd
-%%PORTDOCS%%%%DOCSDIR%%/README.libfswatch.md
 %%PORTDOCS%%%%DOCSDIR%%/README.gnu-build-system
 %%PORTDOCS%%%%DOCSDIR%%/README.illumos
+%%PORTDOCS%%%%DOCSDIR%%/README.libfswatch.md
 %%PORTDOCS%%%%DOCSDIR%%/README.linux
+%%PORTDOCS%%%%DOCSDIR%%/README.macos
 %%PORTDOCS%%%%DOCSDIR%%/README.md
-%%PORTDOCS%%%%DOCSDIR%%/README.osx
 %%PORTDOCS%%%%DOCSDIR%%/README.smartos
 %%PORTDOCS%%%%DOCSDIR%%/README.solaris
 %%PORTDOCS%%%%DOCSDIR%%/README.windows
+%%NLS%%share/locale/en/LC_MESSAGES/fswatch.mo
 %%NLS%%share/locale/en@boldquot/LC_MESSAGES/fswatch.mo
 %%NLS%%share/locale/en@quot/LC_MESSAGES/fswatch.mo
 %%NLS%%share/locale/es/LC_MESSAGES/fswatch.mo
 %%NLS%%share/locale/it/LC_MESSAGES/fswatch.mo
+share/man/man7/fswatch.7.gz