diff --git a/actionmailer/actionmailer.gemspec b/actionmailer/actionmailer.gemspec
index 01a886c5eeeb8..53ed59e9d0312 100644
--- a/actionmailer/actionmailer.gemspec
+++ b/actionmailer/actionmailer.gemspec
@@ -20,6 +20,6 @@ Gem::Specification.new do |s|
   s.has_rdoc = true
 
   s.add_dependency('actionpack',  version)
-  s.add_dependency('mail',        '~> 2.2.0')
+  s.add_dependency('mail',        '>= 2.2', '< 2.9')
   s.add_dependency('text-format', '~> 1.0.0')
 end
diff --git a/actionpack/actionpack.gemspec b/actionpack/actionpack.gemspec
index a5abe9be10e0d..abfc401061b1e 100644
--- a/actionpack/actionpack.gemspec
+++ b/actionpack/actionpack.gemspec
@@ -21,7 +21,7 @@ Gem::Specification.new do |s|
 
   s.add_dependency('activesupport', version)
   s.add_dependency('activemodel',   version)
-  s.add_dependency('rack',          '~> 1.1.0')
+  s.add_dependency('rack',          '>= 1.1', '< 3.2')
   s.add_dependency('rack-test',     '~> 0.5.0')
   s.add_dependency('rack-mount',    '~> 0.6.3')
   s.add_dependency('erubis',        '~> 2.6.5')
diff --git a/activesupport/activesupport.gemspec b/activesupport/activesupport.gemspec
index ad1401bfa9ac0..167fa8ac6572e 100644
--- a/activesupport/activesupport.gemspec
+++ b/activesupport/activesupport.gemspec
@@ -19,7 +19,7 @@ Gem::Specification.new do |s|
 
   s.has_rdoc = true
 
-  s.add_dependency('i18n',            '~> 0.3.6')
+  s.add_dependency('i18n',            '>= 0.3.6', '< 1.15.0')
   s.add_dependency('tzinfo',          '~> 0.3.16')
   s.add_dependency('builder',         '~> 2.1.2')
   s.add_dependency('memcache-client', '>= 1.7.5')