3 files changed, 4 insertions, 3 deletions
diff --git a/activemodel/lib/active_model/gem_version.rb b/activemodel/lib/active_model/gem_version.rb
index d74a3912d6..4563f860c3 100644
--- a/activemodel/lib/active_model/gem_version.rb
+++ b/activemodel/lib/active_model/gem_version.rb
@@ -8,7 +8,7 @@ module ActiveModel
     MAJOR = 5
     MINOR = 0
     TINY  = 0
-    PRE   = "beta1"
+    PRE   = "beta1.1"
 
     STRING = [MAJOR, MINOR, TINY, PRE].compact.join(".")
   end
diff --git a/activemodel/lib/active_model/serializers/json.rb b/activemodel/lib/active_model/serializers/json.rb
index b66dbf1afe..b64a8299e6 100644
--- a/activemodel/lib/active_model/serializers/json.rb
+++ b/activemodel/lib/active_model/serializers/json.rb
@@ -10,7 +10,7 @@ module ActiveModel
       included do
         extend ActiveModel::Naming
 
-        class_attribute :include_root_in_json
+        class_attribute :include_root_in_json, instance_writer: false
         self.include_root_in_json = false
       end
 
diff --git a/activemodel/lib/active_model/validations.rb b/activemodel/lib/active_model/validations.rb
index f23c920d87..8159b9b1d3 100644
--- a/activemodel/lib/active_model/validations.rb
+++ b/activemodel/lib/active_model/validations.rb
@@ -47,9 +47,10 @@ module ActiveModel
       include HelperMethods
 
       attr_accessor :validation_context
+      private :validation_context=
       define_callbacks :validate, scope: :name
 
-      class_attribute :_validators
+      class_attribute :_validators, instance_writer: false
       self._validators = Hash.new { |h,k| h[k] = [] }
     end