diff --git a/CHANGELOG.md b/CHANGELOG.md
index e1dbc55fe..4511e5b9f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -15,7 +15,7 @@
 - New #355, #368, #370, #399: Implement `ColumnFactory` class (@Tigrov)
 - Enh #359: Separate column type constants (@Tigrov)
 - Enh #359: Remove `Schema::TYPE_ARRAY` and `Schema::TYPE_STRUCTURED` constants (@Tigrov)
-- New #360: Realize `ColumnBuilder` class (@Tigrov)
+- New #360, #460: Realize `ColumnBuilder` class (@Tigrov, @vjik)
 - Enh #362: Update according changes in `ColumnSchemaInterface` (@Tigrov)
 - New #364, #372: Add `ColumnDefinitionBuilder` class (@Tigrov)
 - Enh #365, #427: Refactor `Dsn` class (@Tigrov)
@@ -56,6 +56,7 @@
 - Enh #444: Improve `ArrayExpressionBuilder` and `JsonExpressionBuilder` classes (@Tigrov)
 - Chg #447: Update expression namespaces according to changes in `yiisoft/db` package (@Tigrov)
 - Bug #456: Fix typecasting bit columns' values with big size (@Tigrov)
+- Chg #460: Throw exception on "unsigned" column usage (@vjik)
 
 ## 1.3.0 March 21, 2024
 
diff --git a/src/Column/ColumnBuilder.php b/src/Column/ColumnBuilder.php
index d99451211..cf0d4c1ff 100644
--- a/src/Column/ColumnBuilder.php
+++ b/src/Column/ColumnBuilder.php
@@ -37,9 +37,11 @@ public static function integer(?int $size = null): IntegerColumn
         return new IntegerColumn(ColumnType::INTEGER, size: $size);
     }
 
-    public static function bigint(?int $size = null): IntegerColumn
+    public static function bigint(?int $size = null, bool $unsigned = false): BigIntColumn|IntegerColumn
     {
-        return new IntegerColumn(ColumnType::BIGINT, size: $size);
+        return PHP_INT_SIZE === 4 || $unsigned
+            ? new BigIntColumn(ColumnType::BIGINT, size: $size, unsigned: $unsigned)
+            : new IntegerColumn(ColumnType::BIGINT, size: $size, unsigned: $unsigned);
     }
 
     public static function binary(?int $size = null): BinaryColumn
diff --git a/src/Column/ColumnDefinitionBuilder.php b/src/Column/ColumnDefinitionBuilder.php
index 7d2693f40..26bb1c45d 100644
--- a/src/Column/ColumnDefinitionBuilder.php
+++ b/src/Column/ColumnDefinitionBuilder.php
@@ -5,6 +5,7 @@
 namespace Yiisoft\Db\Pgsql\Column;
 
 use Yiisoft\Db\Constant\ColumnType;
+use Yiisoft\Db\Exception\NotSupportedException;
 use Yiisoft\Db\QueryBuilder\AbstractColumnDefinitionBuilder;
 use Yiisoft\Db\Schema\Column\AbstractArrayColumn;
 use Yiisoft\Db\Schema\Column\CollatableColumnInterface;
@@ -40,6 +41,10 @@ final class ColumnDefinitionBuilder extends AbstractColumnDefinitionBuilder
 
     public function build(ColumnInterface $column): string
     {
+        if ($column->isUnsigned()) {
+            throw new NotSupportedException('The "unsigned" attribute is not supported by PostgreSQL.');
+        }
+
         return $this->buildType($column)
             . $this->buildNotNull($column)
             . $this->buildPrimaryKey($column)
diff --git a/src/Column/ColumnFactory.php b/src/Column/ColumnFactory.php
index 270314eb0..8068888d1 100644
--- a/src/Column/ColumnFactory.php
+++ b/src/Column/ColumnFactory.php
@@ -104,6 +104,12 @@ public function fromType(string $type, array $info = []): ColumnInterface
         return $column;
     }
 
+    public function fromPseudoType(string $pseudoType, array $info = []): ColumnInterface
+    {
+        // PostgreSQL doesn't support unsigned types
+        return parent::fromPseudoType($pseudoType, $info)->unsigned(false);
+    }
+
     protected function columnDefinitionParser(): ColumnDefinitionParser
     {
         return new ColumnDefinitionParser();
diff --git a/tests/Provider/ColumnFactoryProvider.php b/tests/Provider/ColumnFactoryProvider.php
index 3b8928ec6..f30edcd98 100644
--- a/tests/Provider/ColumnFactoryProvider.php
+++ b/tests/Provider/ColumnFactoryProvider.php
@@ -105,9 +105,9 @@ public static function pseudoTypes(): array
     {
         $result = parent::pseudoTypes();
         $result['pk'][1] = new IntegerColumn(primaryKey: true, autoIncrement: true);
-        $result['upk'][1] = new IntegerColumn(primaryKey: true, autoIncrement: true, unsigned: true);
+        $result['upk'][1] = new IntegerColumn(primaryKey: true, autoIncrement: true, unsigned: false);
         $result['bigpk'][1] = new IntegerColumn(ColumnType::BIGINT, primaryKey: true, autoIncrement: true);
-        $result['ubigpk'][1] = new IntegerColumn(ColumnType::BIGINT, primaryKey: true, autoIncrement: true, unsigned: true);
+        $result['ubigpk'][1] = new IntegerColumn(ColumnType::BIGINT, primaryKey: true, autoIncrement: true, unsigned: false);
 
         return $result;
     }
diff --git a/tests/Provider/QueryBuilderProvider.php b/tests/Provider/QueryBuilderProvider.php
index 289d23655..bfd2ec6d5 100644
--- a/tests/Provider/QueryBuilderProvider.php
+++ b/tests/Provider/QueryBuilderProvider.php
@@ -396,6 +396,12 @@ public static function buildColumnDefinition(): array
     {
         $values = parent::buildColumnDefinition();
 
+        // PostgreSQL does not support unsigned types
+        unset(
+            $values['bigint(15) unsigned'],
+            $values['unsigned()'],
+        );
+
         $values[PseudoType::PK][0] = 'serial PRIMARY KEY';
         $values[PseudoType::UPK][0] = 'serial PRIMARY KEY';
         $values[PseudoType::BIGPK][0] = 'bigserial PRIMARY KEY';
@@ -443,7 +449,6 @@ public static function buildColumnDefinition(): array
         $values['structured()'][0] = 'jsonb';
         $values['json()'][0] = 'jsonb';
         $values['json(100)'][0] = 'jsonb';
-        $values['unsigned()'][0] = 'integer';
         $values['scale(2)'][0] = 'numeric(10,2)';
         $values['integer(8)->scale(2)'][0] = 'integer';
         $values["collation('collation_name')"] = [