diff --git a/sysutils/rubygem-fluentd/Makefile b/sysutils/rubygem-fluentd/Makefile
index c9c33bfe54bd5..d39c98bd53507 100644
--- a/sysutils/rubygem-fluentd/Makefile
+++ b/sysutils/rubygem-fluentd/Makefile
@@ -1,5 +1,6 @@
 PORTNAME=	fluentd
 PORTVERSION=	1.13.3
+PORTREVISION=	1
 CATEGORIES=	sysutils rubygems
 MASTER_SITES=	RG
 
@@ -11,7 +12,7 @@ LICENSE=	APACHE20
 RUN_DEPENDS=	\
 	rubygem-bundler>=0:sysutils/rubygem-bundler \
 	rubygem-cool.io>=1.4.5<2.0.0:devel/rubygem-cool.io \
-	rubygem-http_parser.rb>=0.5.1<0.8.0:net/rubygem-http_parser.rb \
+	rubygem-http_parser.rb>=0.5.1<0.9.0:net/rubygem-http_parser.rb \
 	rubygem-msgpack>=1.3.1<2.0.0:devel/rubygem-msgpack \
 	rubygem-serverengine>=2.2.2<3.0.0:net/rubygem-serverengine \
 	rubygem-sigdump>=0.2.2<0.3:devel/rubygem-sigdump \
diff --git a/sysutils/rubygem-fluentd/files/patch-gemspec b/sysutils/rubygem-fluentd/files/patch-gemspec
new file mode 100644
index 0000000000000..aff3f37871dd1
--- /dev/null
+++ b/sysutils/rubygem-fluentd/files/patch-gemspec
@@ -0,0 +1,11 @@
+--- fluentd.gemspec.orig	2021-09-26 15:36:14 UTC
++++ fluentd.gemspec
+@@ -29,7 +29,7 @@ Gem::Specification.new do |s|
+       s.add_runtime_dependency(%q<yajl-ruby>.freeze, ["~> 1.0"])
+       s.add_runtime_dependency(%q<cool.io>.freeze, [">= 1.4.5", "< 2.0.0"])
+       s.add_runtime_dependency(%q<serverengine>.freeze, [">= 2.2.2", "< 3.0.0"])
+-      s.add_runtime_dependency(%q<http_parser.rb>.freeze, [">= 0.5.1", "< 0.8.0"])
++      s.add_runtime_dependency(%q<http_parser.rb>.freeze, [">= 0.5.1", "< 0.9.0"])
+       s.add_runtime_dependency(%q<sigdump>.freeze, ["~> 0.2.2"])
+       s.add_runtime_dependency(%q<tzinfo>.freeze, [">= 1.0", "< 3.0"])
+       s.add_runtime_dependency(%q<tzinfo-data>.freeze, ["~> 1.0"])