diff --git a/CHANGELOG.md b/CHANGELOG.md
index 6f84beb42..437119216 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -55,6 +55,7 @@
 - Enh #442: Refactor `DMLQueryBuilder::upsert()` method (@Tigrov)
 - Enh #444: Improve `ArrayExpressionBuilder` and `JsonExpressionBuilder` classes (@Tigrov)
 - Chg #447: Update expression namespaces according to changes in `yiisoft/db` package (@Tigrov)
+- Bug #455: Fix typecasting bit columns' values with big size (@vjik)
 
 ## 1.3.0 March 21, 2024
 
diff --git a/src/Column/BitColumn.php b/src/Column/BitColumn.php
index f2cc4b34b..bff532711 100644
--- a/src/Column/BitColumn.php
+++ b/src/Column/BitColumn.php
@@ -4,16 +4,20 @@
 
 namespace Yiisoft\Db\Pgsql\Column;
 
+use Yiisoft\Db\Constant\ColumnType;
 use Yiisoft\Db\Expression\ExpressionInterface;
-use Yiisoft\Db\Schema\Column\BitColumn as BaseBitColumn;
+use Yiisoft\Db\Schema\Column\AbstractColumn;
 
 use function bindec;
 use function decbin;
 use function gettype;
+use function is_string;
 use function str_pad;
 
-final class BitColumn extends BaseBitColumn
+final class BitColumn extends AbstractColumn
 {
+    protected const DEFAULT_TYPE = ColumnType::BIT;
+
     /** @psalm-suppress RedundantCast */
     public function dbTypecast(mixed $value): string|ExpressionInterface|null
     {
@@ -26,14 +30,21 @@ public function dbTypecast(mixed $value): string|ExpressionInterface|null
         };
     }
 
-    public function phpTypecast(mixed $value): int|null
+    public function phpTypecast(mixed $value): int|string|null
     {
         /** @var int|string|null $value */
-        if (is_string($value)) {
-            /** @var int */
-            return bindec($value);
+        if ($this->isBig() || !is_string($value)) {
+            return $value;
         }
 
-        return $value;
+        /** @var int */
+        return bindec($value);
+    }
+
+    private function isBig(): bool
+    {
+        $size = $this->getSize();
+        return $size === null
+            || $size >= (PHP_INT_SIZE === 8 ? 64 : 32);
     }
 }
diff --git a/tests/ColumnTest.php b/tests/ColumnTest.php
index fff266486..6a942aaea 100644
--- a/tests/ColumnTest.php
+++ b/tests/ColumnTest.php
@@ -383,7 +383,7 @@ public function testPhpTypecastArrayColumn(ColumnInterface $column, array $value
         }
     }
 
-    public function testIntegerColumn()
+    public function testIntegerColumn(): void
     {
         $intCol = new IntegerColumn();
 
@@ -396,7 +396,7 @@ public function testIntegerColumn()
         $this->assertNull($intCol->getSequenceName());
     }
 
-    public function testBigIntColumn()
+    public function testBigIntColumn(): void
     {
         $bigintCol = new BigIntColumn();
 
@@ -408,4 +408,16 @@ public function testBigIntColumn()
 
         $this->assertNull($bigintCol->getSequenceName());
     }
+
+    public function testBitColumnTypecasting(): void
+    {
+        $db = $this->getConnection(true);
+
+        $row = $db->select()->from('test_bit_column')->where(['id' => 1])->withTypecasting()->one();
+
+        $this->assertSame('1100000100011100100110001011000010100000001011001101111011100001', $row['bit_varying_64']);
+        $this->assertSame(9, $row['bit_varying_4']);
+        $this->assertSame('101', $row['bit_varying']);
+        $this->assertSame(1, $row['bit']);
+    }
 }
diff --git a/tests/Support/Fixture/pgsql.sql b/tests/Support/Fixture/pgsql.sql
index ebe84e1be..32af9bb61 100644
--- a/tests/Support/Fixture/pgsql.sql
+++ b/tests/Support/Fixture/pgsql.sql
@@ -490,3 +490,14 @@ CREATE TABLE "test_structured_type"
     "price_array2" "currency_money_structured"[][],
     "range_price_col" "range_price_structured" DEFAULT '("(0,USD)","(100,USD)")'
 );
+
+DROP TABLE IF EXISTS "test_bit_column";
+CREATE TABLE "test_bit_column"
+(
+    "id" SERIAL NOT NULL PRIMARY KEY,
+    "bit_varying_64" BIT VARYING(64),
+    "bit_varying_4" BIT VARYING(4),
+    "bit_varying" BIT VARYING,
+    "bit" BIT
+);
+INSERT INTO "test_bit_column" ("bit_varying_64", "bit_varying_4", "bit_varying", "bit") VALUES (B'1100000100011100100110001011000010100000001011001101111011100001', B'1001', B'101', B'1');