diff --git a/actionpack/actionpack.gemspec b/actionpack/actionpack.gemspec
index 4aa2c894f9..fdd894fe63 100644
--- a/actionpack/actionpack.gemspec
+++ b/actionpack/actionpack.gemspec
@@ -19,13 +19,13 @@ Gem::Specification.new do |s|
 
   s.add_dependency('activesupport',    version)
   s.add_dependency('activemodel',      version)
-  s.add_dependency('rack-cache',       '~> 1.0.0')
+  s.add_dependency('rack-cache',       '~> 1.0.1')
   s.add_dependency('builder',          '~> 3.0.0')
   s.add_dependency('i18n',             '~> 0.6.0beta1')
   s.add_dependency('rack',             '~> 1.3.0.beta')
   s.add_dependency('rack-test',        '~> 0.6.0')
   s.add_dependency('rack-mount',       '~> 0.7.2')
   s.add_dependency('sprockets',        '~> 2.0.0.beta.2')
-  s.add_dependency('tzinfo',           '~> 0.3.23')
+  s.add_dependency('tzinfo',           '~> 0.3.27')
   s.add_dependency('erubis',           '~> 2.7.0')
 end
diff --git a/activerecord/activerecord.gemspec b/activerecord/activerecord.gemspec
index 9d4cbbc150..3a5035305b 100644
--- a/activerecord/activerecord.gemspec
+++ b/activerecord/activerecord.gemspec
@@ -23,5 +23,5 @@ Gem::Specification.new do |s|
   s.add_dependency('activesupport', version)
   s.add_dependency('activemodel',   version)
   s.add_dependency('arel',          '~> 2.1.0')
-  s.add_dependency('tzinfo',        '~> 0.3.23')
+  s.add_dependency('tzinfo',        '~> 0.3.27')
 end
diff --git a/railties/railties.gemspec b/railties/railties.gemspec
index cd0646b8ed..4404838670 100644
--- a/railties/railties.gemspec
+++ b/railties/railties.gemspec
@@ -19,7 +19,7 @@ Gem::Specification.new do |s|
   s.rdoc_options << '--exclude' << '.'
 
   s.add_dependency('rake',          '>= 0.8.7')
-  s.add_dependency('thor',          '~> 0.14.4')
+  s.add_dependency('thor',          '~> 0.14.6')
   s.add_dependency('rack-ssl',      '~> 1.3.2')
   s.add_dependency('activesupport', version)
   s.add_dependency('actionpack',    version)