diff --git a/activerecord/CHANGELOG.md b/activerecord/CHANGELOG.md
index 7b441bcdb2..72920a590c 100644
--- a/activerecord/CHANGELOG.md
+++ b/activerecord/CHANGELOG.md
@@ -1,3 +1,7 @@
+*   Remove deprecated `ActiveRecord::ConnectionAdapters::SQLite3Adapter#valid_alter_table_type?`.
+
+    *Rafael Mendonça França*
+
 *   Do not allow passing the column name to `sum` when a block is passed.
 
     *Rafael Mendonça França*
diff --git a/activerecord/lib/active_record/connection_adapters/sqlite3_adapter.rb b/activerecord/lib/active_record/connection_adapters/sqlite3_adapter.rb
index 3896d4df07..969b648e23 100644
--- a/activerecord/lib/active_record/connection_adapters/sqlite3_adapter.rb
+++ b/activerecord/lib/active_record/connection_adapters/sqlite3_adapter.rb
@@ -307,11 +307,6 @@ module ActiveRecord
         rename_table_indexes(table_name, new_name)
       end
 
-      def valid_alter_table_type?(type, options = {})
-        !invalid_alter_table_type?(type, options)
-      end
-      deprecate :valid_alter_table_type?
-
       def add_column(table_name, column_name, type, options = {}) #:nodoc:
         if invalid_alter_table_type?(type, options)
           alter_table(table_name) do |definition|
diff --git a/activerecord/test/cases/adapters/sqlite3/sqlite3_adapter_test.rb b/activerecord/test/cases/adapters/sqlite3/sqlite3_adapter_test.rb
index 56ceb45040..5c41c14171 100644
--- a/activerecord/test/cases/adapters/sqlite3/sqlite3_adapter_test.rb
+++ b/activerecord/test/cases/adapters/sqlite3/sqlite3_adapter_test.rb
@@ -536,10 +536,6 @@ module ActiveRecord
         end
       end
 
-      def test_deprecate_valid_alter_table_type
-        assert_deprecated { @conn.valid_alter_table_type?(:string) }
-      end
-
       def test_db_is_not_readonly_when_readonly_option_is_false
         conn = Base.sqlite3_connection database: ":memory:",
                                        adapter: "sqlite3",