diff --git a/Gemfile.lock b/Gemfile.lock
index 0fcf5bda3664718faf020c77727c95af804216b9..ce09bcedb34fc4296428dd971b80ae77044025c1 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -17,58 +17,58 @@ GIT
 PATH
   remote: .
   specs:
-    actioncable (5.0.1)
-      actionpack (= 5.0.1)
+    actioncable (5.0.2.rc1)
+      actionpack (= 5.0.2.rc1)
       nio4r (>= 1.2, < 3.0)
       websocket-driver (~> 0.6.1)
-    actionmailer (5.0.1)
-      actionpack (= 5.0.1)
-      actionview (= 5.0.1)
-      activejob (= 5.0.1)
+    actionmailer (5.0.2.rc1)
+      actionpack (= 5.0.2.rc1)
+      actionview (= 5.0.2.rc1)
+      activejob (= 5.0.2.rc1)
       mail (~> 2.5, >= 2.5.4)
       rails-dom-testing (~> 2.0)
-    actionpack (5.0.1)
-      actionview (= 5.0.1)
-      activesupport (= 5.0.1)
+    actionpack (5.0.2.rc1)
+      actionview (= 5.0.2.rc1)
+      activesupport (= 5.0.2.rc1)
       rack (~> 2.0)
       rack-test (~> 0.6.3)
       rails-dom-testing (~> 2.0)
       rails-html-sanitizer (~> 1.0, >= 1.0.2)
-    actionview (5.0.1)
-      activesupport (= 5.0.1)
+    actionview (5.0.2.rc1)
+      activesupport (= 5.0.2.rc1)
       builder (~> 3.1)
       erubis (~> 2.7.0)
       rails-dom-testing (~> 2.0)
       rails-html-sanitizer (~> 1.0, >= 1.0.3)
-    activejob (5.0.1)
-      activesupport (= 5.0.1)
+    activejob (5.0.2.rc1)
+      activesupport (= 5.0.2.rc1)
       globalid (>= 0.3.6)
-    activemodel (5.0.1)
-      activesupport (= 5.0.1)
-    activerecord (5.0.1)
-      activemodel (= 5.0.1)
-      activesupport (= 5.0.1)
+    activemodel (5.0.2.rc1)
+      activesupport (= 5.0.2.rc1)
+    activerecord (5.0.2.rc1)
+      activemodel (= 5.0.2.rc1)
+      activesupport (= 5.0.2.rc1)
       arel (~> 7.0)
-    activesupport (5.0.1)
+    activesupport (5.0.2.rc1)
       concurrent-ruby (~> 1.0, >= 1.0.2)
       i18n (~> 0.7)
       minitest (~> 5.1)
       tzinfo (~> 1.1)
-    rails (5.0.1)
-      actioncable (= 5.0.1)
-      actionmailer (= 5.0.1)
-      actionpack (= 5.0.1)
-      actionview (= 5.0.1)
-      activejob (= 5.0.1)
-      activemodel (= 5.0.1)
-      activerecord (= 5.0.1)
-      activesupport (= 5.0.1)
+    rails (5.0.2.rc1)
+      actioncable (= 5.0.2.rc1)
+      actionmailer (= 5.0.2.rc1)
+      actionpack (= 5.0.2.rc1)
+      actionview (= 5.0.2.rc1)
+      activejob (= 5.0.2.rc1)
+      activemodel (= 5.0.2.rc1)
+      activerecord (= 5.0.2.rc1)
+      activesupport (= 5.0.2.rc1)
       bundler (>= 1.3.0, < 2.0)
-      railties (= 5.0.1)
+      railties (= 5.0.2.rc1)
       sprockets-rails (>= 2.0.0)
-    railties (5.0.1)
-      actionpack (= 5.0.1)
-      activesupport (= 5.0.1)
+    railties (5.0.2.rc1)
+      actionpack (= 5.0.2.rc1)
+      activesupport (= 5.0.2.rc1)
       method_source
       rake (>= 0.8.7)
       thor (>= 0.18.1, < 2.0)
@@ -160,7 +160,7 @@ GEM
       activesupport (>= 4.1.0)
     hiredis (0.6.1)
     http_parser.rb (0.6.0)
-    i18n (0.8.0)
+    i18n (0.8.1)
     jquery-rails (4.2.1)
       rails-dom-testing (>= 1, < 3)
       railties (>= 4.2.0)
@@ -191,7 +191,7 @@ GEM
     mysql2 (0.4.5)
     mysql2 (0.4.5-x64-mingw32)
     mysql2 (0.4.5-x86-mingw32)
-    nio4r (1.2.1)
+    nio4r (2.0.0)
     nokogiri (1.7.0)
       mini_portile2 (~> 2.1.0)
     nokogiri (1.7.0-x64-mingw32)
@@ -370,4 +370,4 @@ DEPENDENCIES
   wdm (>= 0.1.0)
 
 BUNDLED WITH
-   1.14.3
+   1.14.4
diff --git a/RAILS_VERSION b/RAILS_VERSION
index 6b244dcd6960b101b0ab4d9e5162d39632dec80c..963eea3a80e1c72b742e755b44bf3a937168c5bd 100644
--- a/RAILS_VERSION
+++ b/RAILS_VERSION
@@ -1 +1 @@
-5.0.1
+5.0.2.rc1
diff --git a/actioncable/CHANGELOG.md b/actioncable/CHANGELOG.md
index 2e964d0b49adbffcfa4e9df2f65a1fd8943631b2..ad0d19d4f6c3e8fa346550dba53896b667c5ff64 100644
--- a/actioncable/CHANGELOG.md
+++ b/actioncable/CHANGELOG.md
@@ -1,3 +1,8 @@
+## Rails 5.0.2.rc1 (February 24, 2017) ##
+
+*   No changes.
+
+
 ## Rails 5.0.1 (December 21, 2016) ##
 
 *   No changes.
diff --git a/actioncable/lib/action_cable/gem_version.rb b/actioncable/lib/action_cable/gem_version.rb
index f6a7af249793bdf208dc22642bc6c0cf4138c435..1d7a0910053c29197f3cbd85c2c88857611b59c7 100644
--- a/actioncable/lib/action_cable/gem_version.rb
+++ b/actioncable/lib/action_cable/gem_version.rb
@@ -7,8 +7,8 @@ def self.gem_version
   module VERSION
     MAJOR = 5
     MINOR = 0
-    TINY  = 1
-    PRE   = nil
+    TINY  = 2
+    PRE   = "rc1"
 
     STRING = [MAJOR, MINOR, TINY, PRE].compact.join(".")
   end
diff --git a/actioncable/package.json b/actioncable/package.json
index e51556725c9cdb542d9016bc69f0b3a18f4a7f4c..5115bc946a50b24970e440402ea903a05d58f7aa 100644
--- a/actioncable/package.json
+++ b/actioncable/package.json
@@ -1,6 +1,6 @@
 {
   "name": "actioncable",
-  "version": "5.0.1",
+  "version": "5.0.2-rc1",
   "description": "WebSocket framework for Ruby on Rails.",
   "main": "lib/assets/compiled/action_cable.js",
   "files": [
diff --git a/actionmailer/CHANGELOG.md b/actionmailer/CHANGELOG.md
index ba4c79d978e6f34dfb971f7f36f078b130214266..24b4827f087fcea6488de2ccac172608bcfee99b 100644
--- a/actionmailer/CHANGELOG.md
+++ b/actionmailer/CHANGELOG.md
@@ -1,3 +1,8 @@
+## Rails 5.0.2.rc1 (February 24, 2017) ##
+
+*   No changes.
+
+
 ## Rails 5.0.1 (December 21, 2016) ##
 
 *   No changes.
diff --git a/actionmailer/lib/action_mailer/gem_version.rb b/actionmailer/lib/action_mailer/gem_version.rb
index f24d347a25ab557a758ee4971269fa05fa207414..1c8d3a7d78169a9473c1af90185a9ec05676008c 100644
--- a/actionmailer/lib/action_mailer/gem_version.rb
+++ b/actionmailer/lib/action_mailer/gem_version.rb
@@ -7,8 +7,8 @@ def self.gem_version
   module VERSION
     MAJOR = 5
     MINOR = 0
-    TINY  = 1
-    PRE   = nil
+    TINY  = 2
+    PRE   = "rc1"
 
     STRING = [MAJOR, MINOR, TINY, PRE].compact.join(".")
   end
diff --git a/actionpack/CHANGELOG.md b/actionpack/CHANGELOG.md
index 1abdd1866ffbd1b45efef5c78bf7e5dc811256ad..ae86dc21dae1e947828f81a14c75706fcb735243 100644
--- a/actionpack/CHANGELOG.md
+++ b/actionpack/CHANGELOG.md
@@ -1,3 +1,5 @@
+## Rails 5.0.2.rc1 (February 24, 2017) ##
+
 *   Make `with_routing` test helper work when testing controllers inheriting from `ActionController::API`.
 
     *Julia López*
diff --git a/actionpack/lib/action_pack/gem_version.rb b/actionpack/lib/action_pack/gem_version.rb
index 5c65b8e1fcd3887c8e8504397d7b04565a963e08..32796573763b65ac44dec294d358aae643e477f1 100644
--- a/actionpack/lib/action_pack/gem_version.rb
+++ b/actionpack/lib/action_pack/gem_version.rb
@@ -7,8 +7,8 @@ def self.gem_version
   module VERSION
     MAJOR = 5
     MINOR = 0
-    TINY  = 1
-    PRE   = nil
+    TINY  = 2
+    PRE   = "rc1"
 
     STRING = [MAJOR, MINOR, TINY, PRE].compact.join(".")
   end
diff --git a/actionview/CHANGELOG.md b/actionview/CHANGELOG.md
index dc5edb94378753a765972a78e0550e38d5eb5fe0..49a455376f5dc70b1e02190970174264d23f64f4 100644
--- a/actionview/CHANGELOG.md
+++ b/actionview/CHANGELOG.md
@@ -1,3 +1,5 @@
+## Rails 5.0.2.rc1 (February 24, 2017) ##
+
 *   Allow render locals to be assigned to instance variables in a view.
 
     Fixes #27480.
diff --git a/actionview/lib/action_view/gem_version.rb b/actionview/lib/action_view/gem_version.rb
index 3324792eba90b429e0a6c29482bacbab69194ba6..0f70116d3c69ff2fb8f8b95c0333954a63eed1fc 100644
--- a/actionview/lib/action_view/gem_version.rb
+++ b/actionview/lib/action_view/gem_version.rb
@@ -7,8 +7,8 @@ def self.gem_version
   module VERSION
     MAJOR = 5
     MINOR = 0
-    TINY  = 1
-    PRE   = nil
+    TINY  = 2
+    PRE   = "rc1"
 
     STRING = [MAJOR, MINOR, TINY, PRE].compact.join(".")
   end
diff --git a/activejob/CHANGELOG.md b/activejob/CHANGELOG.md
index e280d478de5e580650f929f72793694bd408e302..5c4065c8ad2fc3fe154f1bf26dbd939b83803822 100644
--- a/activejob/CHANGELOG.md
+++ b/activejob/CHANGELOG.md
@@ -1,3 +1,8 @@
+## Rails 5.0.2.rc1 (February 24, 2017) ##
+
+*   No changes.
+
+
 ## Rails 5.0.1 (December 21, 2016) ##
 
 *   No changes.
diff --git a/activejob/lib/active_job/gem_version.rb b/activejob/lib/active_job/gem_version.rb
index 4b632eb6c3c0c543c754c36a558bf855a8b6758b..9fe3676df2ed6dbbd97e4682e8e3e167b8f5a3df 100644
--- a/activejob/lib/active_job/gem_version.rb
+++ b/activejob/lib/active_job/gem_version.rb
@@ -7,8 +7,8 @@ def self.gem_version
   module VERSION
     MAJOR = 5
     MINOR = 0
-    TINY  = 1
-    PRE   = nil
+    TINY  = 2
+    PRE   = "rc1"
 
     STRING = [MAJOR, MINOR, TINY, PRE].compact.join(".")
   end
diff --git a/activemodel/CHANGELOG.md b/activemodel/CHANGELOG.md
index 8eae032e3010bbeba84386f2bc3b6a99004dd749..b97c456c70a111e91e71e6dddb089ce99fb50e0d 100644
--- a/activemodel/CHANGELOG.md
+++ b/activemodel/CHANGELOG.md
@@ -1,3 +1,8 @@
+## Rails 5.0.2.rc1 (February 24, 2017) ##
+
+*   No changes.
+
+
 ## Rails 5.0.1 (December 21, 2016) ##
 
 *   No changes.
diff --git a/activemodel/lib/active_model/gem_version.rb b/activemodel/lib/active_model/gem_version.rb
index 4453590dc72481f07b6835da2a936b85b8fb6b46..8c021a3accaa7bdbb53ad2d7b86f8d87da3ad150 100644
--- a/activemodel/lib/active_model/gem_version.rb
+++ b/activemodel/lib/active_model/gem_version.rb
@@ -7,8 +7,8 @@ def self.gem_version
   module VERSION
     MAJOR = 5
     MINOR = 0
-    TINY  = 1
-    PRE   = nil
+    TINY  = 2
+    PRE   = "rc1"
 
     STRING = [MAJOR, MINOR, TINY, PRE].compact.join(".")
   end
diff --git a/activerecord/CHANGELOG.md b/activerecord/CHANGELOG.md
index 43ddd90f78b6fe8b6feb6179862c4c446340a580..4208c0cb061818de28cd771f234c2c27adf29a14 100644
--- a/activerecord/CHANGELOG.md
+++ b/activerecord/CHANGELOG.md
@@ -1,3 +1,5 @@
+## Rails 5.0.2.rc1 (February 24, 2017) ##
+
 *   Fix `wait_timeout` to configurable for mysql2 adapter.
 
     Fixes #26556.
diff --git a/activerecord/lib/active_record/gem_version.rb b/activerecord/lib/active_record/gem_version.rb
index d707a849c69ea4c485728e405f2bbf345bd09116..5d7fc9cf07bacbddbbb3dad5f2b654c798108e34 100644
--- a/activerecord/lib/active_record/gem_version.rb
+++ b/activerecord/lib/active_record/gem_version.rb
@@ -7,8 +7,8 @@ def self.gem_version
   module VERSION
     MAJOR = 5
     MINOR = 0
-    TINY  = 1
-    PRE   = nil
+    TINY  = 2
+    PRE   = "rc1"
 
     STRING = [MAJOR, MINOR, TINY, PRE].compact.join(".")
   end
diff --git a/activesupport/CHANGELOG.md b/activesupport/CHANGELOG.md
index 90cd9035f13aa931085117bee62ae9a399c84724..ebc32048fbd655aa10ec6d6a63e369490862b515 100644
--- a/activesupport/CHANGELOG.md
+++ b/activesupport/CHANGELOG.md
@@ -1,3 +1,5 @@
+## Rails 5.0.2.rc1 (February 24, 2017) ##
+
 *   In Core Extensions, make `MarshalWithAutoloading#load` pass through the second, optional
     argument for `Marshal#load( source [, proc] )`. This way we don't have to do 
     `Marshal.method(:load).super_method.call(sourse, proc)` just to be able to pass a proc.
diff --git a/activesupport/lib/active_support/gem_version.rb b/activesupport/lib/active_support/gem_version.rb
index 7a806ccb78937e84af9c40a4bbf8ca9b28b57137..e0e2b2bdae8f0a728d4478e66a0324fc02bb4d9a 100644
--- a/activesupport/lib/active_support/gem_version.rb
+++ b/activesupport/lib/active_support/gem_version.rb
@@ -7,8 +7,8 @@ def self.gem_version
   module VERSION
     MAJOR = 5
     MINOR = 0
-    TINY  = 1
-    PRE   = nil
+    TINY  = 2
+    PRE   = "rc1"
 
     STRING = [MAJOR, MINOR, TINY, PRE].compact.join(".")
   end
diff --git a/guides/CHANGELOG.md b/guides/CHANGELOG.md
index 3832db78cd9f57f53210e53f0a48fc445bed7337..c98d06335100f9340548cbad9e6d0f05557e244b 100644
--- a/guides/CHANGELOG.md
+++ b/guides/CHANGELOG.md
@@ -1,3 +1,8 @@
+## Rails 5.0.2.rc1 (February 24, 2017) ##
+
+*   No changes.
+
+
 ## Rails 5.0.1 (December 21, 2016) ##
 
 *   No changes.
diff --git a/railties/CHANGELOG.md b/railties/CHANGELOG.md
index 231a2de8e1440d433c423bbc1f68651ada4b3fc5..f143d0fee1375322d432fdaf4143f31caf24b165 100644
--- a/railties/CHANGELOG.md
+++ b/railties/CHANGELOG.md
@@ -1,3 +1,5 @@
+## Rails 5.0.2.rc1 (February 24, 2017) ##
+
 *   Fix running multiple tests in one `rake` command
 
     e.g. `bin/rake test:models test:controllers`
diff --git a/railties/lib/rails/gem_version.rb b/railties/lib/rails/gem_version.rb
index eac16d626f1caf9b447bf21a0f31660a454ed647..b5526218eea549556cab89fd64fec61d7633a46e 100644
--- a/railties/lib/rails/gem_version.rb
+++ b/railties/lib/rails/gem_version.rb
@@ -7,8 +7,8 @@ def self.gem_version
   module VERSION
     MAJOR = 5
     MINOR = 0
-    TINY  = 1
-    PRE   = nil
+    TINY  = 2
+    PRE   = "rc1"
 
     STRING = [MAJOR, MINOR, TINY, PRE].compact.join(".")
   end
diff --git a/version.rb b/version.rb
index eac16d626f1caf9b447bf21a0f31660a454ed647..b5526218eea549556cab89fd64fec61d7633a46e 100644
--- a/version.rb
+++ b/version.rb
@@ -7,8 +7,8 @@ def self.gem_version
   module VERSION
     MAJOR = 5
     MINOR = 0
-    TINY  = 1
-    PRE   = nil
+    TINY  = 2
+    PRE   = "rc1"
 
     STRING = [MAJOR, MINOR, TINY, PRE].compact.join(".")
   end