diff --git a/CHANGELOG.md b/CHANGELOG.md
index d099e31..af7895d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,8 @@ The format is based on Keep a Changelog, and this project adheres to Semantic Ve
 
 ## 0.5.1 Under development
 
+- fix: make `HasAttributes::attributes()` update existing attributes and add `replaceAttributes()` for full replacement.
+
 ## 0.5.0 April 29, 2026
 
 - fix: remove `ui-awesome/html-interop` from runtime dependencies and keep it as a development-only dependency for local tooling and tests.
diff --git a/UPGRADE.md b/UPGRADE.md
index 823e1c9..ecfc4f4 100644
--- a/UPGRADE.md
+++ b/UPGRADE.md
@@ -1,5 +1,12 @@
 # Upgrade Guide
 
+## 0.5.1
+
+### Attribute replacement
+
+- `HasAttributes::attributes()` now updates existing attributes instead of replacing the full attribute bag.
+- Use `replaceAttributes()` when you need to discard previous attributes before applying new ones.
+
 ## 0.5.0
 
 ### Runtime dependencies
diff --git a/src/HasAttributes.php b/src/HasAttributes.php
index 9a8dfb0..d81bc74 100644
--- a/src/HasAttributes.php
+++ b/src/HasAttributes.php
@@ -18,9 +18,7 @@
 trait HasAttributes
 {
     /**
-     * HTML attributes array used by the implementing class.
-     *
-     * @var mixed[]
+     * @var mixed[] HTML attributes array used by the implementing class.
      */
     protected array $attributes = [];
 
@@ -38,11 +36,11 @@ public function addAttribute(string|UnitEnum $key, mixed $value): static
     }
 
     /**
-     * Replaces all HTML attributes for the element.
+     * Adds or updates multiple HTML attributes for the element.
      *
      * @param mixed[] $values Associative array of attribute keys and values.
      *
-     * @return static New instance with the replaced attributes value.
+     * @return static New instance with the updated attributes value.
      */
     public function attributes(array $values): static
     {
@@ -88,6 +86,22 @@ public function removeAttribute(string|UnitEnum $key): static
         return $new;
     }
 
+    /**
+     * Replaces all HTML attributes for the element.
+     *
+     * @param mixed[] $values Associative array of attribute keys and values.
+     *
+     * @return static New instance with the replaced attributes value.
+     */
+    public function replaceAttributes(array $values): static
+    {
+        $new = clone $this;
+
+        AttributeBag::replace($new->attributes, $values);
+
+        return $new;
+    }
+
     /**
      * Sets a single HTML attribute for internal fluent setters.
      *
@@ -107,18 +121,18 @@ private function setAttribute(string|UnitEnum $key, mixed $value, string $prefix
     }
 
     /**
-     * Replaces all HTML attributes for internal fluent setters.
+     * Adds or updates multiple HTML attributes for internal fluent setters.
      *
      * @param mixed[] $values Associative array of attribute keys and values.
      * @param string $prefix Prefix to ensure (for example, `aria-`, `data-`, `on`).
      *
-     * @return static New instance with the replaced attributes value.
+     * @return static New instance with the updated attributes value.
      */
     private function setAttributes(array $values, string $prefix = ''): static
     {
         $new = clone $this;
 
-        AttributeBag::replace($new->attributes, $values, $prefix);
+        AttributeBag::setMany($new->attributes, $values, $prefix);
 
         return $new;
     }
diff --git a/tests/HasAttributesTest.php b/tests/HasAttributesTest.php
index 48f9457..9243370 100644
--- a/tests/HasAttributesTest.php
+++ b/tests/HasAttributesTest.php
@@ -19,8 +19,9 @@
  * Test coverage.
  * - Adds single attributes through the public API.
  * - Ensures fluent setters return new instances (immutability).
- * - Replaces attributes through the public API.
+ * - Merges attributes through the public API.
  * - Removes attributes and returns expected values.
+ * - Replaces attributes through the explicit replacement API.
  * - Sets prefixed attributes through protected internals exposed by test stubs.
  * - Throws InvalidArgumentException for empty or unsupported attribute keys.
  *
@@ -99,6 +100,26 @@ public function __toString(): string
         );
     }
 
+    public function testAttributesMergeExistingValues(): void
+    {
+        $instance = new class {
+            use HasAttributes;
+        };
+
+        $instance = $instance->attributes(['id' => 'my-id']);
+        $instance = $instance->attributes(['class' => 'my-class']);
+        $instance = $instance->attributes(['class' => 'new-class']);
+
+        self::assertSame(
+            [
+                'id' => 'my-id',
+                'class' => 'new-class',
+            ],
+            $instance->getAttributes(),
+            'Should merge new attributes and update existing attributes.',
+        );
+    }
+
     public function testAttributesPrefixSupportThroughProtectedInternals(): void
     {
         $instance = new class {
@@ -126,9 +147,12 @@ public function testAttributesPrefixSupportThroughProtectedInternals(): void
             "Should set and read prefixed attributes via internal 'setAttributes()'.",
         );
         self::assertSame(
-            ['aria-describedby' => 'field-id'],
+            [
+                'aria-label' => 'label',
+                'aria-describedby' => 'field-id',
+            ],
             $instance->getAttributes(),
-            'Should replace the attribute bag when setting prefixed attributes in bulk.',
+            'Should merge prefixed attributes in bulk.',
         );
 
         $instance = $instance->removeAttribute('aria-describedby');
@@ -139,22 +163,6 @@ public function testAttributesPrefixSupportThroughProtectedInternals(): void
         );
     }
 
-    public function testAttributesReplaceExistingValues(): void
-    {
-        $instance = new class {
-            use HasAttributes;
-        };
-
-        $instance = $instance->attributes(['id' => 'my-id']);
-        $instance = $instance->attributes(['class' => 'my-class']);
-
-        self::assertSame(
-            ['class' => 'my-class'],
-            $instance->getAttributes(),
-            'Should replace existing attributes instead of merging them.',
-        );
-    }
-
     public function testAttributesValue(): void
     {
         $instance = new class {
@@ -239,6 +247,27 @@ public function testRemoveAttributeValue(): void
         );
     }
 
+    public function testReplaceAttributesReplacesExistingValues(): void
+    {
+        $instance = new class {
+            use HasAttributes;
+        };
+
+        $original = $instance->attributes(['id' => 'my-id']);
+        $replacement = $original->replaceAttributes(['class' => 'my-class']);
+
+        self::assertSame(
+            ['id' => 'my-id'],
+            $original->getAttributes(),
+            'Should keep the original attributes unchanged after explicit replacement.',
+        );
+        self::assertSame(
+            ['class' => 'my-class'],
+            $replacement->getAttributes(),
+            'Should replace existing attributes through the explicit replacement API.',
+        );
+    }
+
     public function testReturnNewInstanceWhenSettingAttributes(): void
     {
         $instance = new class {
@@ -261,6 +290,11 @@ public function testReturnNewInstanceWhenSettingAttributes(): void
             $instance->removeAttribute('tests'),
             'Should return a new instance when removing an attribute, ensuring immutability.',
         );
+        self::assertNotSame(
+            $instance,
+            $instance->replaceAttributes([]),
+            'Should return a new instance when replacing attributes, ensuring immutability.',
+        );
         self::assertNotSame(
             $instance,
             $instance->setAttributeForTest('tests', ''),