diff --git a/www/ruby-rainbows/Makefile b/www/ruby-rainbows/Makefile
index 2cc8f2e86e2..aeb64b6123a 100644
--- a/www/ruby-rainbows/Makefile
+++ b/www/ruby-rainbows/Makefile
@@ -1,8 +1,8 @@
-# $OpenBSD: Makefile,v 1.19 2019/07/12 21:02:29 sthen Exp $
+# $OpenBSD: Makefile,v 1.20 2021/03/20 19:51:41 jeremy Exp $
 
 COMMENT =	ruby-unicorn for sleepy apps and slow clients
 
-DISTNAME =	rainbows-5.1.1
+DISTNAME =	rainbows-5.2.1
 CATEGORIES =	www
 
 HOMEPAGE =	https://bogomips.org/rainbows/
@@ -16,7 +16,7 @@ MODULES =	lang/ruby
 
 BUILD_DEPENDS =	${RUN_DEPENDS}
 RUN_DEPENDS =	devel/ruby-kgio,${MODRUBY_FLAVOR}>=2.5,<3.0 \
-		www/ruby-unicorn,${MODRUBY_FLAVOR}>=5.1,<6.0 \
+		www/ruby-unicorn,${MODRUBY_FLAVOR}>=5.1 \
 		www/ruby-rack,${MODRUBY_FLAVOR}>=1.1.0,<3.0
 
 CONFIGURE_STYLE = ruby gem
diff --git a/www/ruby-rainbows/distinfo b/www/ruby-rainbows/distinfo
index 53f4be68b66..9f1f6a06a48 100644
--- a/www/ruby-rainbows/distinfo
+++ b/www/ruby-rainbows/distinfo
@@ -1,2 +1,2 @@
-SHA256 (rainbows-5.1.1.gem) = MZpsae3qvwzaDcc+r1UcZuNZJ7vE9VuD072oG93xfgM=
-SIZE (rainbows-5.1.1.gem) = 158720
+SHA256 (rainbows-5.2.1.gem) = irKjwYH/JFApCTufNaubGfrw2viTu77naBxu4jlLQPk=
+SIZE (rainbows-5.2.1.gem) = 156160
diff --git a/www/ruby-rainbows/patches/patch-_metadata b/www/ruby-rainbows/patches/patch-_metadata
index 43ec50a6e22..3069b1ae3c0 100644
--- a/www/ruby-rainbows/patches/patch-_metadata
+++ b/www/ruby-rainbows/patches/patch-_metadata
@@ -1,15 +1,16 @@
-$OpenBSD: patch-_metadata,v 1.1 2017/03/28 23:38:05 jeremy Exp $
+$OpenBSD: patch-_metadata,v 1.2 2021/03/20 19:51:41 jeremy Exp $
 
-Allow prerelease unicorn gem.
+Work with unicorn 6.
 
---- .metadata.orig	Tue Mar 28 16:34:55 2017
-+++ .metadata	Tue Mar 28 16:35:13 2017
-@@ -46,7 +46,7 @@ dependencies:
-       - !ruby/object:Gem::Version
-         version: '5.0'
-   type: :runtime
--  prerelease: false
-+  prerelease: true
-   version_requirements: !ruby/object:Gem::Requirement
+Index: .metadata
+--- .metadata.orig
++++ .metadata
+@@ -48,7 +48,7 @@ dependencies:
+   name: unicorn
+   requirement: !ruby/object:Gem::Requirement
      requirements:
-     - - "~>"
+-    - - "~>"
++    - - ">"
+       - !ruby/object:Gem::Version
+         version: '5.1'
+   type: :runtime
diff --git a/www/ruby-rainbows/pkg/PLIST b/www/ruby-rainbows/pkg/PLIST
index ac154d7da47..235fba7c736 100644
--- a/www/ruby-rainbows/pkg/PLIST
+++ b/www/ruby-rainbows/pkg/PLIST
@@ -1,4 +1,4 @@
-@comment $OpenBSD: PLIST,v 1.7 2017/11/14 17:03:55 jeremy Exp $
+@comment $OpenBSD: PLIST,v 1.8 2021/03/20 19:51:41 jeremy Exp $
 ${GEM_BIN}/rainbows${GEM_BIN_SUFFIX}
 ${GEM_LIB}/cache/${DISTNAME}.gem
 ${GEM_LIB}/gems/${DISTNAME}/
@@ -11,9 +11,7 @@ ${GEM_LIB}/gems/${DISTNAME}/COPYING
 ${GEM_LIB}/gems/${DISTNAME}/DEPLOY
 ${GEM_LIB}/gems/${DISTNAME}/Documentation/
 ${GEM_LIB}/gems/${DISTNAME}/Documentation/.gitignore
-${GEM_LIB}/gems/${DISTNAME}/Documentation/GNUmakefile
 ${GEM_LIB}/gems/${DISTNAME}/Documentation/comparison.haml
-${GEM_LIB}/gems/${DISTNAME}/Documentation/rainbows.1.txt
 ${GEM_LIB}/gems/${DISTNAME}/FAQ
 ${GEM_LIB}/gems/${DISTNAME}/GIT-VERSION-FILE
 ${GEM_LIB}/gems/${DISTNAME}/GIT-VERSION-GEN
@@ -32,7 +30,6 @@ ${GEM_LIB}/gems/${DISTNAME}/TUNING
 ${GEM_LIB}/gems/${DISTNAME}/Test_Suite
 ${GEM_LIB}/gems/${DISTNAME}/archive/
 ${GEM_LIB}/gems/${DISTNAME}/archive/.gitignore
-${GEM_LIB}/gems/${DISTNAME}/archive/rfmig.rb
 ${GEM_LIB}/gems/${DISTNAME}/archive/slrnpull.conf
 ${GEM_LIB}/gems/${DISTNAME}/bin/
 ${GEM_LIB}/gems/${DISTNAME}/bin/rainbows