Start Rails 6.0 development!!!

:tada::tada::tada:

2 files changed, 4 insertions, 68 deletions

diff --git a/activemodel/CHANGELOG.md b/activemodel/CHANGELOG.md
index 86353674d9..13ea7d0bf3 100644
--- a/activemodel/CHANGELOG.md
+++ b/activemodel/CHANGELOG.md
@@ -1,67 +1,3 @@
-*   Models using the attributes API with a proc default can now be marshalled.
 
-    Fixes #31216.
 
-    *Sean Griffin*
-
-*   Fix to working before/after validation callbacks on multiple contexts.
-
-    *Yoshiyuki Hirano*
-
-
-## Rails 5.2.0.beta2 (November 28, 2017) ##
-
-*   No changes.
-
-
-## Rails 5.2.0.beta1 (November 27, 2017) ##
-
-*   Execute `ConfirmationValidator` validation when `_confirmation`'s value is `false`.
-
-    *bogdanvlviv*
-
-*   Allow passing a Proc or Symbol to length validator options.
-
-    *Matt Rohrer*
-
-*   Add method `#merge!` for `ActiveModel::Errors`.
-
-    *Jahfer Husain*
-
-*   Fix regression in numericality validator when comparing Decimal and Float input
-    values with more scale than the schema.
-
-    *Bradley Priest*
-
-*   Fix methods `#keys`, `#values` in `ActiveModel::Errors`.
-
-    Change `#keys` to only return the keys that don't have empty messages.
-
-    Change `#values` to only return the not empty values.
-
-    Example:
-
-        # Before
-        person = Person.new
-        person.errors.keys     # => []
-        person.errors.values   # => []
-        person.errors.messages # => {}
-        person.errors[:name]   # => []
-        person.errors.messages # => {:name => []}
-        person.errors.keys     # => [:name]
-        person.errors.values   # => [[]]
-
-        # After
-        person = Person.new
-        person.errors.keys     # => []
-        person.errors.values   # => []
-        person.errors.messages # => {}
-        person.errors[:name]   # => []
-        person.errors.messages # => {:name => []}
-        person.errors.keys     # => []
-        person.errors.values   # => []
-
-    *bogdanvlviv*
-
-
-Please check [5-1-stable](https://github.com/rails/rails/blob/5-1-stable/activemodel/CHANGELOG.md) for previous changes.
+Please check [5-2-stable](https://github.com/rails/rails/blob/5-2-stable/activemodel/CHANGELOG.md) for previous changes.
diff --git a/activemodel/lib/active_model/gem_version.rb b/activemodel/lib/active_model/gem_version.rb
index 3c344fe854..cef5441e4a 100644
--- a/activemodel/lib/active_model/gem_version.rb
+++ b/activemodel/lib/active_model/gem_version.rb
@@ -7,10 +7,10 @@ module ActiveModel
   end
 
   module VERSION
-    MAJOR = 5
-    MINOR = 2
+    MAJOR = 6
+    MINOR = 0
     TINY  = 0
-    PRE   = "beta2"
+    PRE   = "alpha"
 
     STRING = [MAJOR, MINOR, TINY, PRE].compact.join(".")
   end