diff --git a/src/Column/ColumnFactory.php b/src/Column/ColumnFactory.php
index 346b5fa4..3b902d5f 100644
--- a/src/Column/ColumnFactory.php
+++ b/src/Column/ColumnFactory.php
@@ -8,7 +8,7 @@
 use Yiisoft\Db\Schema\Column\ColumnSchemaInterface;
 use Yiisoft\Db\Schema\SchemaInterface;
 
-class ColumnFactory extends AbstractColumnFactory
+final class ColumnFactory extends AbstractColumnFactory
 {
     /**
      * Mapping from physical column types (keys) to abstract column types (values).