diff --git a/actionmailer/actionmailer.gemspec b/actionmailer/actionmailer.gemspec
index d5c0a4c9c4..31d8efc7bf 100644
--- a/actionmailer/actionmailer.gemspec
+++ b/actionmailer/actionmailer.gemspec
@@ -4,6 +4,7 @@ Gem::Specification.new do |s|
   s.version     = '3.0.0.beta1'
   s.summary     = 'Email composition, delivery, and recieval framework (part of Rails).'
   s.description = 'Email composition, delivery, and recieval framework (part of Rails).'
+  s.required_ruby_version = '>= 1.8.7'
 
   s.author            = 'David Heinemeier Hansson'
   s.email             = 'david@loudthinking.com'
diff --git a/actionpack/actionpack.gemspec b/actionpack/actionpack.gemspec
index ef141f2202..a35c4aac72 100644
--- a/actionpack/actionpack.gemspec
+++ b/actionpack/actionpack.gemspec
@@ -4,6 +4,7 @@ Gem::Specification.new do |s|
   s.version     = '3.0.0.beta1'
   s.summary     = 'Web-flow and rendering framework putting the VC in MVC (part of Rails).'
   s.description = 'Web-flow and rendering framework putting the VC in MVC (part of Rails).'
+  s.required_ruby_version = '>= 1.8.7'
 
   s.author            = 'David Heinemeier Hansson'
   s.email             = 'david@loudthinking.com'
diff --git a/activemodel/activemodel.gemspec b/activemodel/activemodel.gemspec
index e5b0207e39..b4fbe26d97 100644
--- a/activemodel/activemodel.gemspec
+++ b/activemodel/activemodel.gemspec
@@ -4,6 +4,7 @@ Gem::Specification.new do |s|
   s.version = '3.0.0.beta1'
   s.summary = "A toolkit for building other modeling frameworks like ActiveRecord"
   s.description = %q{Extracts common modeling concerns from ActiveRecord to share between similar frameworks like ActiveResource.}
+  s.required_ruby_version = '>= 1.8.7'
 
   s.author = "David Heinemeier Hansson"
   s.email = "david@loudthinking.com"
diff --git a/activerecord/activerecord.gemspec b/activerecord/activerecord.gemspec
index 82a31b262b..aeaafbb694 100644
--- a/activerecord/activerecord.gemspec
+++ b/activerecord/activerecord.gemspec
@@ -4,6 +4,7 @@ Gem::Specification.new do |s|
   s.version     = '3.0.0.beta1'
   s.summary     = 'Object-relational mapper framework (part of Rails).'
   s.description = 'Object-relational mapper framework (part of Rails).'
+  s.required_ruby_version = '>= 1.8.7'
 
   s.author            = 'David Heinemeier Hansson'
   s.email             = 'david@loudthinking.com'
diff --git a/activeresource/activeresource.gemspec b/activeresource/activeresource.gemspec
index 51a381ccc8..1722ebeb8e 100644
--- a/activeresource/activeresource.gemspec
+++ b/activeresource/activeresource.gemspec
@@ -4,6 +4,7 @@ Gem::Specification.new do |s|
   s.version     = '3.0.0.beta1'
   s.summary     = 'REST-model framework (part of Rails).'
   s.description = 'REST-model framework (part of Rails).'
+  s.required_ruby_version = '>= 1.8.7'
 
   s.author            = 'David Heinemeier Hansson'
   s.email             = 'david@loudthinking.com'
diff --git a/activesupport/activesupport.gemspec b/activesupport/activesupport.gemspec
index d169392dfc..d0557230aa 100644
--- a/activesupport/activesupport.gemspec
+++ b/activesupport/activesupport.gemspec
@@ -4,6 +4,7 @@ Gem::Specification.new do |s|
   s.version     = '3.0.0.beta1'
   s.summary     = 'Support and utility classes used by the Rails framework.'
   s.description = 'Support and utility classes used by the Rails framework.'
+  s.required_ruby_version = '>= 1.8.7'
 
   s.author            = 'David Heinemeier Hansson'
   s.email             = 'david@loudthinking.com'
diff --git a/rails.gemspec b/rails.gemspec
index fa79fee152..1460dd5688 100644
--- a/rails.gemspec
+++ b/rails.gemspec
@@ -4,12 +4,13 @@ Gem::Specification.new do |s|
   s.version     = '3.0.0.beta1'
   s.summary     = 'Full-stack web-application framework.'
   s.description = 'Full-stack web-application framework.'
+  s.required_ruby_version = '>= 1.8.7'
 
   s.author            = 'David Heinemeier Hansson'
   s.email             = 'david@loudthinking.com'
   s.homepage          = 'http://www.rubyonrails.org'
   s.rubyforge_project = 'rails'
-
+  
   s.files = []
   s.require_path = []
 
diff --git a/rails3b.gemspec b/rails3b.gemspec
index 4aa342e6c0..e28f752e97 100644
--- a/rails3b.gemspec
+++ b/rails3b.gemspec
@@ -4,6 +4,7 @@ Gem::Specification.new do |s|
   s.version     = '3.0.0'
   s.summary     = 'Just the Rails 3 beta dependencies. Works around prerelease RubyGems bug.'
   s.description = 'My kingdom for working dependencies.'
+  s.required_ruby_version = '>= 1.8.7'
 
   s.author            = 'Jeremy Kemper'
   s.email             = 'jeremy@bitsweat.net'
diff --git a/railties/railties.gemspec b/railties/railties.gemspec
index 4fedb64c93..65d2dde89f 100644
--- a/railties/railties.gemspec
+++ b/railties/railties.gemspec
@@ -4,6 +4,7 @@ Gem::Specification.new do |s|
   s.version     = '3.0.0.beta1'
   s.summary     = 'Controls boot-up, rake tasks and generators for the Rails framework.'
   s.description = 'Controls boot-up, rake tasks and generators for the Rails framework.'
+  s.required_ruby_version = '>= 1.8.7'
 
   s.author            = 'David Heinemeier Hansson'
   s.email             = 'david@loudthinking.com'