diff --git a/net-mgmt/nagios4/Makefile b/net-mgmt/nagios4/Makefile
index eb98f6d76c6b..b823f2bd39c0 100644
--- a/net-mgmt/nagios4/Makefile
+++ b/net-mgmt/nagios4/Makefile
@@ -1,106 +1,106 @@
 PORTNAME=	nagios
-PORTVERSION=	4.4.13
-PORTREVISION=	1
+PORTVERSION=	4.5.0
+PORTREVISION=	0
 PORTEPOCH=	1
 CATEGORIES=	net-mgmt
 MASTER_SITES=	https://assets.nagios.com/downloads/nagioscore/releases/ \
 		SF/${PORTNAME}/${PORTNAME}-4.x/${PORTNAME}-${PORTVERSION}
 PKGNAMESUFFIX=	4
 
 MAINTAINER=	joneum@FreeBSD.org
 COMMENT=	Powerful network monitoring system
 WWW=		https://www.nagios.org/
 
 LICENSE=	GPLv2
 
 LIB_DEPENDS=	libltdl.so:devel/libltdl \
 		libpng.so:graphics/png \
 		libgd.so:graphics/gd
 
 USES=		cpe gmake jpeg perl5 php
 USE_PERL5=	build
 USE_PHP=	xml filter
 USE_RC_SUBR=	nagios
 
 CONFLICTS=	nagios-[123].* nagios-devel
 
 GNU_CONFIGURE=	yes
 CONFIGURE_ARGS=	--with-command-user=${NAGIOSUSER} \
 		--with-command-group=${WWWGRP} \
 		--with-nagios-user=${NAGIOSUSER} \
 		--with-nagios-group=${NAGIOSGROUP} \
 		--with-htmurl=${NAGIOSHTMURL} \
 		--with-cgiurl=${NAGIOSCGIURL} \
 		--with-lockfile=${NAGIOSDIR}/nagios.lock \
 		--with-cgibindir=${WWWDIR}/cgi-bin \
 		--libexecdir=${PREFIX}/libexec/nagios \
 		--datadir=${WWWDIR} \
 		--sysconfdir=${PREFIX}/etc/nagios \
 		--localstatedir=${NAGIOSDIR} \
 		--with-httpd-conf=${PREFIX}/etc \
 		--with-checkresult-dir=${NAGIOSDIR}/checkresults \
 		--disable-statuswrl \
 		--enable-event-broker \
 		ac_cv_lib_iconv_main=no
 CONFIGURE_ENV=	PERL=${PERL}
 
 CPPFLAGS+=	-I${LOCALBASE}/include
 CFLAGS+=	${CPPFLAGS}
 LIBS+=		-L${LOCALBASE}/lib
 
 INSTALL_TARGET=	install install-commandmode install-config
 PLIST_SUB=	NAGIOSDIR=${NAGIOSDIR} \
 		NAGIOSUSER=${NAGIOSUSER} \
 		NAGIOSGROUP=${NAGIOSGROUP} \
 		WWWGRP=${WWWGRP}
 SUB_LIST=	NAGIOSDIR=${NAGIOSDIR} \
 		NAGIOSUSER=${NAGIOSUSER} \
 		NAGIOSGROUP=${NAGIOSGROUP} \
 		NAGIOSHTMURL=${NAGIOSHTMURL} \
 		NAGIOSCGIURL=${NAGIOSCGIURL}
 
 SUB_FILES=	pkg-message
 
 NAGIOSUSER?=	nagios
 NAGIOSGROUP?=	nagios
 NAGIOSDIR?=	/var/spool/nagios
 
 .if defined(NAGIOSWWWDIR)
 WWWDIR=	${PREFIX}/${NAGIOSWWWDIR}
 .endif
 NAGIOSHTMURL?=	/nagios
 NAGIOSCGIURL?=	${NAGIOSHTMURL}/cgi-bin
 
 USERS=		${NAGIOSUSER}
 GROUPS=		${NAGIOSGROUP}
 
 OPTIONS_DEFINE=	NANOSLEEP UNHANDLED_HACK COREWINDOW
 OPTIONS_RADIO=		PLUGINS
 OPTIONS_RADIO_PLUGINS=	MONPLUGINS NAGPLUGINS
 OPTIONS_DEFAULT=	NAGPLUGINS
 NANOSLEEP_DESC=		Use nanosleep in event timing
 UNHANDLED_HACK_DESC=	Display passive checks in unhandled queries
 COREWINDOW_DESC=	Enable the corewindow parameter
 
 MONPLUGINS_RUN_DEPENDS=	${LOCALBASE}/libexec/nagios/check_nagios:net-mgmt/monitoring-plugins
 NAGPLUGINS_RUN_DEPENDS=	${LOCALBASE}/libexec/nagios/check_nagios:net-mgmt/nagios-plugins
 COREWINDOW_CONFIGURE_ENABLE=	corewindow
 
 OPTIONS_SUB=
 
 NANOSLEEP_CONFIGURE_ENABLE=	nanosleep
 
 post-patch:
 	${REINPLACE_CMD} -e 's/\<77\([0-7]\)\>/75\1/g; s/\<66\([0-7]\)\>/64\1/; /chmod/d; \
 		/\.cfg$$/s/$$/-sample/' \
 		${WRKSRC}/Makefile.in ${WRKSRC}/base/Makefile.in ${WRKSRC}/cgi/Makefile.in ${WRKSRC}/contrib/Makefile.in ${WRKSRC}/html/Makefile.in
 
 post-patch-UNHANDLED_HACK-on:
 	${REINPLACE_CMD} -e 's#;serviceprops=42\&#;serviceprops=10\&#g' -e \
 		's#;hostprops=42\"#;hostprops=10\"#g' ${WRKSRC}/html/side.php
 
 post-install:
 	@${RMDIR} ${STAGEDIR}${PREFIX}/libexec/nagios
 	@${MV} ${STAGEDIR}${WWWDIR}/config.inc.php ${STAGEDIR}${WWWDIR}/config.inc.php.sample
 
 .include <bsd.port.mk>
diff --git a/net-mgmt/nagios4/distinfo b/net-mgmt/nagios4/distinfo
index 8f5fa461b28b..2e6b571bdb0c 100644
--- a/net-mgmt/nagios4/distinfo
+++ b/net-mgmt/nagios4/distinfo
@@ -1,3 +1,3 @@
-TIMESTAMP = 1685866161
-SHA256 (nagios-4.4.13.tar.gz) = c289488c7ba71e66aae9890113eee475b9cedfe92f663a899ac6f70764fc1727
-SIZE (nagios-4.4.13.tar.gz) = 11341150
+TIMESTAMP = 1708115629
+SHA256 (nagios-4.5.0.tar.gz) = 164e05daed1adf72640b323453b6c13f4d13d90e56a95c7cdd8dccf8519e9be0
+SIZE (nagios-4.5.0.tar.gz) = 11540118
diff --git a/net-mgmt/nagios4/files/patch-html_index.php.in b/net-mgmt/nagios4/files/patch-html_index.php.in
index b6589b525c46..b8cfe2514a32 100644
--- a/net-mgmt/nagios4/files/patch-html_index.php.in
+++ b/net-mgmt/nagios4/files/patch-html_index.php.in
@@ -1,11 +1,17 @@
---- html/index.php.in.orig	2017-02-23 20:00:40 UTC
-+++ html/index.php.in
-@@ -1,6 +1,7 @@
+--- html/index.php.in.orig	2024-02-17 08:44:48.310422000 +0100
++++ html/index.php.in	2024-02-17 09:00:54.496033000 +0100
+@@ -1,4 +1,5 @@
  <?php
 +include_once(dirname(__FILE__).'/includes/utils.inc.php');
  // Allow specifying main window URL for permalinks, etc.
--$url = 'main.php';
-+$url = $cfg['cgi_base_url'].'/tac.cgi';
+ $url = 'main.php';
  
- if ("@COREWINDOW@" == "yes" && isset($_GET['corewindow'])) {
+@@ -23,7 +24,7 @@ if ("@COREWINDOW@" == "yes" && isset($_GET['corewindow
+ 		}
+ 	}
+ 	if (preg_match("/^http:\/\/|^https:\/\/|^\//", $url) != 1)
+-		$url = "main.php";
++		$url = $cfg['cgi_base_url'].'/tac.cgi';
+ }
  
+ $this_year = '2023';
diff --git a/net-mgmt/nagios4/files/patch-html_main.php b/net-mgmt/nagios4/files/patch-html_main.php
index 39377e342321..a8228acc1c12 100644
--- a/net-mgmt/nagios4/files/patch-html_main.php
+++ b/net-mgmt/nagios4/files/patch-html_main.php
@@ -1,36 +1,36 @@
---- html/main.php.orig	2023-06-04 10:27:05.620233000 +0200
-+++ html/main.php	2023-06-04 10:31:49.442315000 +0200
+--- html/main.php.orig	2024-02-17 09:09:32.460023000 +0100
++++ html/main.php	2024-02-17 09:12:55.192427000 +0100
 @@ -146,33 +146,6 @@ $this_year = '2023';
  	<div class="product">Nagios<sup><span style="font-size: small;">&reg;</span></sup> Core<sup><span style="font-size: small;">&trade;</span></sup></div>
  	<div class="version">Version <?php echo $this_version; ?></div>
- 	<div class="releasedate">June 01, 2023</div>
+ 	<div class="releasedate">November 14, 2023</div>
 -	<div class="checkforupdates"><a href="https://www.nagios.org/checkforupdates/?version=<?php echo $this_version; ?>&amp;product=nagioscore" target="_blank">Check for updates</a></div>
 -</div>
 -
 -
 -<div id="updateversioninfo">
 -<?php
 -	$updateinfo = get_update_information();
 -	if (!$updateinfo['update_checks_enabled']) {
 -?>
 -		<div class="updatechecksdisabled">
 -			<div class="warningmessage">Warning: Automatic Update Checks are Disabled!</div>
 -			<div class="submessage">Disabling update checks presents a possible security risk.  Visit <a href="https://www.nagios.org/" target="_blank">nagios.org</a> to check for updates manually or enable update checks in your Nagios config file.</a></div>
 -		</div>
 -<?php
 -	} else if (
 -		$updateinfo['update_available'] && $this_version < $updateinfo['update_version']
 -	) {
 -?>
 -		<div class="updateavailable">
 -			<div class="updatemessage">A new version of Nagios Core is available!</div>
 -			<div class="submessage">Visit <a href="https://www.nagios.org/download/" target="_blank">nagios.org</a> to download Nagios <?php echo htmlentities($updateinfo['update_version'], ENT_QUOTES, 'UTF-8');?>.</div>
 -		</div>
 -<?php
 -	}
 -?>
 -</div>
 -
  
  <div id='splashrow0'>
  	<div id="splashbox0" class="splashbox-media"><!-- info banner feed -->