diff --git a/devel/rubygem-message_bus/Makefile b/devel/rubygem-message_bus/Makefile
index b622812914bc..6d60f623808c 100644
--- a/devel/rubygem-message_bus/Makefile
+++ b/devel/rubygem-message_bus/Makefile
@@ -1,23 +1,23 @@
 PORTNAME=	message_bus
-PORTVERSION=	4.4.1
+PORTVERSION=	4.5.1
 CATEGORIES=	devel rubygems
 MASTER_SITES=	RG
 
 MAINTAINER=	ruby@FreeBSD.org
 COMMENT=	Message bus for rack
 WWW=		https://github.com/discourse/message_bus
 
 LICENSE=	MIT
 LICENSE_FILE=	${WRKSRC}/LICENSE
 
-RUN_DEPENDS=	rubygem-rack>=1.1.3,3:www/rubygem-rack
+RUN_DEPENDS=	rubygem-rack>=2,3<4,3:www/rubygem-rack
 
 USES=		cpe gem shebangfix
 
 NO_ARCH=	yes
 
 CPE_VENDOR=	discourse
 
 SHEBANG_FILES=	examples/chat/docker_container/update_chat
 
 .include <bsd.port.mk>
diff --git a/devel/rubygem-message_bus/distinfo b/devel/rubygem-message_bus/distinfo
index 31516550c7c1..2261a4d8ec6f 100644
--- a/devel/rubygem-message_bus/distinfo
+++ b/devel/rubygem-message_bus/distinfo
@@ -1,3 +1,3 @@
-TIMESTAMP = 1744289438
-SHA256 (rubygem/message_bus-4.4.1.gem) = 719ec5c3167e6571030dee0f43eafa99dbf68ae67fca6fd63c265ff55c0c2adb
-SIZE (rubygem/message_bus-4.4.1.gem) = 203776
+TIMESTAMP = 1771422102
+SHA256 (rubygem/message_bus-4.5.1.gem) = e004e4ad42a0e333c74b180e41c98bff5e73c90e9431a4033b1e6501608c5f25
+SIZE (rubygem/message_bus-4.5.1.gem) = 185856