diff --git a/actionmailer/README.rdoc b/actionmailer/README.rdoc
index a14a6ba18f..a02ea86153 100644
--- a/actionmailer/README.rdoc
+++ b/actionmailer/README.rdoc
@@ -142,7 +142,7 @@ The latest version of Action Mailer can be installed with RubyGems:
 
 Source code can be downloaded as part of the Rails project on GitHub
 
-* https://github.com/rails/rails/tree/master/actionmailer
+* https://github.com/rails/rails/tree/4-0-stable/actionmailer
 
 
 == License
diff --git a/actionpack/README.rdoc b/actionpack/README.rdoc
index 29a7fcf0f0..f730a873a9 100644
--- a/actionpack/README.rdoc
+++ b/actionpack/README.rdoc
@@ -37,7 +37,7 @@ The latest version of Action Pack can be installed with RubyGems:
 
 Source code can be downloaded as part of the Rails project on GitHub
 
-* https://github.com/rails/rails/tree/master/actionpack
+* https://github.com/rails/rails/tree/4-0-stable/actionpack
 
 
 == License
diff --git a/activemodel/README.rdoc b/activemodel/README.rdoc
index a399fe9051..46ef28d60f 100644
--- a/activemodel/README.rdoc
+++ b/activemodel/README.rdoc
@@ -227,7 +227,7 @@ The latest version of Active Model can be installed with RubyGems:
 
 Source code can be downloaded as part of the Rails project on GitHub
 
-* https://github.com/rails/rails/tree/master/activemodel
+* https://github.com/rails/rails/tree/4-0-stable/activemodel
 
 
 == License
diff --git a/activerecord/README.rdoc b/activerecord/README.rdoc
index 822e460918..19faeec282 100644
--- a/activerecord/README.rdoc
+++ b/activerecord/README.rdoc
@@ -192,7 +192,7 @@ The latest version of Active Record can be installed with RubyGems:
 
 Source code can be downloaded as part of the Rails project on GitHub:
 
-* https://github.com/rails/rails/tree/master/activerecord
+* https://github.com/rails/rails/tree/4-0-stable/activerecord
 
 
 == License
diff --git a/activesupport/README.rdoc b/activesupport/README.rdoc
index f3582767c0..58ced9331c 100644
--- a/activesupport/README.rdoc
+++ b/activesupport/README.rdoc
@@ -14,7 +14,7 @@ The latest version of Active Support can be installed with RubyGems:
 
 Source code can be downloaded as part of the Rails project on GitHub:
 
-* https://github.com/rails/rails/tree/master/activesupport
+* https://github.com/rails/rails/tree/4-0-stable/activesupport
 
 
 == License
diff --git a/railties/README.rdoc b/railties/README.rdoc
index 6248b5feed..8834a2d207 100644
--- a/railties/README.rdoc
+++ b/railties/README.rdoc
@@ -17,7 +17,7 @@ The latest version of Railties can be installed with RubyGems:
 
 Source code can be downloaded as part of the Rails project on GitHub
 
-* https://github.com/rails/rails/tree/master/railties
+* https://github.com/rails/rails/tree/4-0-stable/railties
 
 == License