diff --git a/www/rubygem-em-websocket/Makefile b/www/rubygem-em-websocket/Makefile
index 18517adaf8f0..bfe1f4d253b1 100644
--- a/www/rubygem-em-websocket/Makefile
+++ b/www/rubygem-em-websocket/Makefile
@@ -1,22 +1,23 @@
 # Created by: Sunpoet Po-Chuan Hsieh <sunpoet@FreeBSD.org>
 
 PORTNAME=	em-websocket
 PORTVERSION=	0.5.2
+PORTREVISION=	1
 CATEGORIES=	www rubygems
 MASTER_SITES=	RG
 
 MAINTAINER=	sunpoet@FreeBSD.org
 COMMENT=	EventMachine based WebSocket server
 
 LICENSE=	MIT
 LICENSE_FILE=	${WRKSRC}/LICENCE
 
 RUN_DEPENDS=	rubygem-eventmachine>=0.12.9:devel/rubygem-eventmachine \
-		rubygem-http_parser.rb>=0.6.0<0.7:net/rubygem-http_parser.rb
+		rubygem-http_parser.rb>=0.6.0<1:net/rubygem-http_parser.rb
 
 USES=		gem
 USE_RUBY=	yes
 
 NO_ARCH=	yes
 
 .include <bsd.port.mk>
diff --git a/www/rubygem-em-websocket/files/patch-gemspec b/www/rubygem-em-websocket/files/patch-gemspec
new file mode 100644
index 000000000000..0851e6256080
--- /dev/null
+++ b/www/rubygem-em-websocket/files/patch-gemspec
@@ -0,0 +1,11 @@
+--- em-websocket.gemspec.orig	2021-07-15 21:52:22 UTC
++++ em-websocket.gemspec
+@@ -23,7 +23,7 @@ Gem::Specification.new do |s|
+ 
+     if Gem::Version.new(Gem::VERSION) >= Gem::Version.new('1.2.0') then
+       s.add_runtime_dependency(%q<eventmachine>.freeze, [">= 0.12.9"])
+-      s.add_runtime_dependency(%q<http_parser.rb>.freeze, ["~> 0.6.0"])
++      s.add_runtime_dependency(%q<http_parser.rb>.freeze, ["~> 0.6"])
+     else
+       s.add_dependency(%q<eventmachine>.freeze, [">= 0.12.9"])
+       s.add_dependency(%q<http_parser.rb>.freeze, ["~> 0.6.0"])