diff --git a/actionmailer/actionmailer.gemspec b/actionmailer/actionmailer.gemspec
index d7f450f751d..7ecc35b7c73 100644
--- a/actionmailer/actionmailer.gemspec
+++ b/actionmailer/actionmailer.gemspec
@@ -12,7 +12,7 @@ Gem::Specification.new do |s|
   s.email             = 'david@loudthinking.com'
   s.homepage          = 'http://www.rubyonrails.org'
 
-  s.files        = Dir['CHANGELOG', 'README.rdoc', 'MIT-LICENSE', 'lib/**/*']
+  s.files        = Dir['CHANGELOG.md', 'README.rdoc', 'MIT-LICENSE', 'lib/**/*']
   s.require_path = 'lib'
   s.requirements << 'none'
 
diff --git a/actionpack/actionpack.gemspec b/actionpack/actionpack.gemspec
index c2eac234b08..c261fc8a8f3 100644
--- a/actionpack/actionpack.gemspec
+++ b/actionpack/actionpack.gemspec
@@ -12,7 +12,7 @@ Gem::Specification.new do |s|
   s.email             = 'david@loudthinking.com'
   s.homepage          = 'http://www.rubyonrails.org'
 
-  s.files        = Dir['CHANGELOG', 'README.rdoc', 'MIT-LICENSE', 'lib/**/*']
+  s.files        = Dir['CHANGELOG.md', 'README.rdoc', 'MIT-LICENSE', 'lib/**/*']
   s.require_path = 'lib'
   s.requirements << 'none'
 
diff --git a/activemodel/activemodel.gemspec b/activemodel/activemodel.gemspec
index 260ad01b656..49f664bf89f 100644
--- a/activemodel/activemodel.gemspec
+++ b/activemodel/activemodel.gemspec
@@ -13,7 +13,7 @@ Gem::Specification.new do |s|
   s.email             = 'david@loudthinking.com'
   s.homepage          = 'http://www.rubyonrails.org'
 
-  s.files        = Dir['CHANGELOG', 'MIT-LICENSE', 'README.rdoc', 'lib/**/*']
+  s.files        = Dir['CHANGELOG.md', 'MIT-LICENSE', 'README.rdoc', 'lib/**/*']
   s.require_path = 'lib'
 
   s.add_dependency('activesupport', version)
diff --git a/activerecord/activerecord.gemspec b/activerecord/activerecord.gemspec
index 2de81c31a39..b4622005b41 100644
--- a/activerecord/activerecord.gemspec
+++ b/activerecord/activerecord.gemspec
@@ -13,7 +13,7 @@ Gem::Specification.new do |s|
   s.email             = 'david@loudthinking.com'
   s.homepage          = 'http://www.rubyonrails.org'
 
-  s.files        = Dir['CHANGELOG', 'MIT-LICENSE', 'README.rdoc', 'examples/**/*', 'lib/**/*']
+  s.files        = Dir['CHANGELOG.md', 'MIT-LICENSE', 'README.rdoc', 'examples/**/*', 'lib/**/*']
   s.require_path = 'lib'
 
   s.extra_rdoc_files = %w( README.rdoc )
diff --git a/activeresource/activeresource.gemspec b/activeresource/activeresource.gemspec
index a8772ecf8c0..f5c26f38df2 100644
--- a/activeresource/activeresource.gemspec
+++ b/activeresource/activeresource.gemspec
@@ -13,7 +13,7 @@ Gem::Specification.new do |s|
   s.email             = 'david@loudthinking.com'
   s.homepage          = 'http://www.rubyonrails.org'
 
-  s.files        = Dir['CHANGELOG', 'MIT-LICENSE', 'README.rdoc', 'examples/**/*', 'lib/**/*']
+  s.files        = Dir['CHANGELOG.md', 'MIT-LICENSE', 'README.rdoc', 'examples/**/*', 'lib/**/*']
   s.require_path = 'lib'
 
   s.extra_rdoc_files = %w( README.rdoc )
diff --git a/activesupport/activesupport.gemspec b/activesupport/activesupport.gemspec
index 2ee6bb788a8..70d17fb5800 100644
--- a/activesupport/activesupport.gemspec
+++ b/activesupport/activesupport.gemspec
@@ -13,7 +13,7 @@ Gem::Specification.new do |s|
   s.email        = 'david@loudthinking.com'
   s.homepage     = 'http://www.rubyonrails.org'
 
-  s.files        = Dir['CHANGELOG', 'MIT-LICENSE', 'README.rdoc', 'lib/**/*']
+  s.files        = Dir['CHANGELOG.md', 'MIT-LICENSE', 'README.rdoc', 'lib/**/*']
   s.require_path = 'lib'
 
   s.add_dependency('i18n',       '~> 0.6')
diff --git a/railties/railties.gemspec b/railties/railties.gemspec
index b9171288852..a7b9407daf9 100644
--- a/railties/railties.gemspec
+++ b/railties/railties.gemspec
@@ -12,7 +12,7 @@ Gem::Specification.new do |s|
   s.email             = 'david@loudthinking.com'
   s.homepage          = 'http://www.rubyonrails.org'
 
-  s.files              = Dir['CHANGELOG', 'README.rdoc', 'bin/**/*', 'guides/**/*', 'lib/**/{*,.[a-z]*}']
+  s.files              = Dir['CHANGELOG.md', 'README.rdoc', 'bin/**/*', 'guides/**/*', 'lib/**/{*,.[a-z]*}']
   s.require_path       = 'lib'
 
   s.bindir             = 'bin'