diff --git a/lib/validates_timeliness/orm/active_record.rb b/lib/validates_timeliness/orm/active_record.rb
index c468ddd..c41e9a2 100644
--- a/lib/validates_timeliness/orm/active_record.rb
+++ b/lib/validates_timeliness/orm/active_record.rb
@@ -14,27 +14,18 @@ module ValidatesTimeliness
           timeliness_column_for_attribute(attr_name).type
         end
 
-        if ::ActiveModel.version >= Gem::Version.new('4.2')
-          def timeliness_column_for_attribute(attr_name)
-            columns_hash.fetch(attr_name.to_s) do |key|
-              validation_type = _validators[key.to_sym].find {|v| v.kind == :timeliness }.type.to_s
-              ::ActiveRecord::ConnectionAdapters::Column.new(key, nil, lookup_cast_type(validation_type), validation_type)
-            end
+        def timeliness_column_for_attribute(attr_name)
+          columns_hash.fetch(attr_name.to_s) do |key|
+            validation_type = _validators[key.to_sym].find {|v| v.kind == :timeliness }.type.to_s
+            ::ActiveRecord::ConnectionAdapters::Column.new(key, nil, lookup_cast_type(validation_type), validation_type)
           end
-          
-          def lookup_cast_type(sql_type)
-            case sql_type
-            when 'datetime' then ::ActiveRecord::Type::DateTime.new
-            when 'date' then ::ActiveRecord::Type::Date.new
-            when 'time' then ::ActiveRecord::Type::Time.new
-            end
-          end
-        else
-          def timeliness_column_for_attribute(attr_name)
-            columns_hash.fetch(attr_name.to_s) do |key|
-              validation_type = _validators[key.to_sym].find {|v| v.kind == :timeliness }.type.to_s
-              ::ActiveRecord::ConnectionAdapters::Column.new(key, nil, validation_type)
-            end
+        end
+
+        def lookup_cast_type(sql_type)
+          case sql_type
+          when 'datetime' then ::ActiveRecord::Type::DateTime.new
+          when 'date' then ::ActiveRecord::Type::Date.new
+          when 'time' then ::ActiveRecord::Type::Time.new
           end
         end
 
diff --git a/lib/validates_timeliness/validator.rb b/lib/validates_timeliness/validator.rb
index 82b09e1..a31a612 100644
--- a/lib/validates_timeliness/validator.rb
+++ b/lib/validates_timeliness/validator.rb
@@ -55,11 +55,6 @@ module ValidatesTimeliness
       end
     end
 
-    # Rails 4.0 compatibility for old #setup method with class as arg
-    if Gem::Version.new(ActiveModel::VERSION::STRING) <= Gem::Version.new('4.1')
-      alias_method(:setup, :setup_timeliness_validated_attributes) 
-    end
-
     def validate_each(record, attr_name, value)
       raw_value = attribute_raw_value(record, attr_name) || value
       return if (@allow_nil && raw_value.nil?) || (@allow_blank && raw_value.blank?)