diff --git a/RAILS_VERSION b/RAILS_VERSION
index 59e61f95df9670cb933bcd6551601b3602460008..e33286503d43a7b3fb23f73f090d16fdb02b2daa 100644
--- a/RAILS_VERSION
+++ b/RAILS_VERSION
@@ -1 +1 @@
-4.2.0.alpha
+4.2.0.beta1
diff --git a/actionmailer/lib/action_mailer/gem_version.rb b/actionmailer/lib/action_mailer/gem_version.rb
index b564813ccf4ff9ca9b4cfc9e4f30ff6fde6abc25..a266f50cd7b5bd67ee5fd37cadb6ebfe46ce1942 100644
--- a/actionmailer/lib/action_mailer/gem_version.rb
+++ b/actionmailer/lib/action_mailer/gem_version.rb
@@ -8,7 +8,7 @@ module VERSION
     MAJOR = 4
     MINOR = 2
     TINY  = 0
-    PRE   = "alpha"
+    PRE   = "beta1"
 
     STRING = [MAJOR, MINOR, TINY, PRE].compact.join(".")
   end
diff --git a/actionpack/lib/action_pack/gem_version.rb b/actionpack/lib/action_pack/gem_version.rb
index beaf35d3daa2bd6e7c787e01ee9e7aaa6cd42b30..8658069c8600b6654ef5ca1307c951cddec24d78 100644
--- a/actionpack/lib/action_pack/gem_version.rb
+++ b/actionpack/lib/action_pack/gem_version.rb
@@ -8,7 +8,7 @@ module VERSION
     MAJOR = 4
     MINOR = 2
     TINY  = 0
-    PRE   = "alpha"
+    PRE   = "beta1"
 
     STRING = [MAJOR, MINOR, TINY, PRE].compact.join(".")
   end
diff --git a/actionview/lib/action_view/gem_version.rb b/actionview/lib/action_view/gem_version.rb
index 9266e55c47947263fe11b2799b5f0c23d79ba118..7375e537e0e40f2a07f888e65f0f0068b4c29543 100644
--- a/actionview/lib/action_view/gem_version.rb
+++ b/actionview/lib/action_view/gem_version.rb
@@ -8,7 +8,7 @@ module VERSION
     MAJOR = 4
     MINOR = 2
     TINY  = 0
-    PRE   = "alpha"
+    PRE   = "beta1"
 
     STRING = [MAJOR, MINOR, TINY, PRE].compact.join(".")
   end
diff --git a/activejob/lib/active_job/gem_version.rb b/activejob/lib/active_job/gem_version.rb
index c166020b28cc5631e21ddcc4dd5c4193ff3609af..d41c916085919a3a17a8b6180972fdf7f03b8723 100644
--- a/activejob/lib/active_job/gem_version.rb
+++ b/activejob/lib/active_job/gem_version.rb
@@ -8,7 +8,7 @@ module VERSION
     MAJOR = 4
     MINOR = 2
     TINY  = 0
-    PRE   = "alpha"
+    PRE   = "beta1"
 
     STRING = [MAJOR, MINOR, TINY, PRE].compact.join(".")
   end
diff --git a/activemodel/lib/active_model/gem_version.rb b/activemodel/lib/active_model/gem_version.rb
index 964b24398d5c108192d06befb17f1e2653ca29ac..8fbd8453b126d82b94f7e7ed46db2e38a73c27c9 100644
--- a/activemodel/lib/active_model/gem_version.rb
+++ b/activemodel/lib/active_model/gem_version.rb
@@ -8,7 +8,7 @@ module VERSION
     MAJOR = 4
     MINOR = 2
     TINY  = 0
-    PRE   = "alpha"
+    PRE   = "beta1"
 
     STRING = [MAJOR, MINOR, TINY, PRE].compact.join(".")
   end
diff --git a/activerecord/lib/active_record/gem_version.rb b/activerecord/lib/active_record/gem_version.rb
index 4a7aace46046245b78c6c69b5a7b3d3422a62518..38343928606a65f62a133fc2de60bcfb7db3e568 100644
--- a/activerecord/lib/active_record/gem_version.rb
+++ b/activerecord/lib/active_record/gem_version.rb
@@ -8,7 +8,7 @@ module VERSION
     MAJOR = 4
     MINOR = 2
     TINY  = 0
-    PRE   = "alpha"
+    PRE   = "beta1"
 
     STRING = [MAJOR, MINOR, TINY, PRE].compact.join(".")
   end
diff --git a/activesupport/lib/active_support/gem_version.rb b/activesupport/lib/active_support/gem_version.rb
index 83a3bf7a5d77da6b8f9c183aee6194ee81abb372..e026c4f899ac7f8ad5f82f613d1085d6f7e01e54 100644
--- a/activesupport/lib/active_support/gem_version.rb
+++ b/activesupport/lib/active_support/gem_version.rb
@@ -8,7 +8,7 @@ module VERSION
     MAJOR = 4
     MINOR = 2
     TINY  = 0
-    PRE   = "alpha"
+    PRE   = "beta1"
 
     STRING = [MAJOR, MINOR, TINY, PRE].compact.join(".")
   end
diff --git a/railties/lib/rails/gem_version.rb b/railties/lib/rails/gem_version.rb
index c7397c4f15c90a84f0e56e25d7a79294c84c70e6..672b78c599eb9940eb1d45d438fb416aa701e528 100644
--- a/railties/lib/rails/gem_version.rb
+++ b/railties/lib/rails/gem_version.rb
@@ -8,7 +8,7 @@ module VERSION
     MAJOR = 4
     MINOR = 2
     TINY  = 0
-    PRE   = "alpha"
+    PRE   = "beta1"
 
     STRING = [MAJOR, MINOR, TINY, PRE].compact.join(".")
   end
diff --git a/version.rb b/version.rb
index c7397c4f15c90a84f0e56e25d7a79294c84c70e6..672b78c599eb9940eb1d45d438fb416aa701e528 100644
--- a/version.rb
+++ b/version.rb
@@ -8,7 +8,7 @@ module VERSION
     MAJOR = 4
     MINOR = 2
     TINY  = 0
-    PRE   = "alpha"
+    PRE   = "beta1"
 
     STRING = [MAJOR, MINOR, TINY, PRE].compact.join(".")
   end