diff --git a/src/wp-includes/class-wp-block.php b/src/wp-includes/class-wp-block.php
index 732e0e347052f..57db98d2ee6cd 100644
--- a/src/wp-includes/class-wp-block.php
+++ b/src/wp-includes/class-wp-block.php
@@ -109,7 +109,7 @@ class WP_Block {
 	private const BLOCK_BINDINGS_SUPPORTED_ATTRIBUTES = array(
 		'core/paragraph' => array( 'content' ),
 		'core/heading'   => array( 'content' ),
-		'core/image'     => array( 'id', 'url', 'title', 'alt' ),
+		'core/image'     => array( 'id', 'url', 'title', 'alt', 'caption' ),
 		'core/button'    => array( 'url', 'text', 'linkTarget', 'rel' ),
 		'core/post-date' => array( 'datetime' ),
 	);
diff --git a/tests/phpunit/tests/block-bindings/render.php b/tests/phpunit/tests/block-bindings/render.php
index d640e7d5207e4..fa8178cbd39b2 100644
--- a/tests/phpunit/tests/block-bindings/render.php
+++ b/tests/phpunit/tests/block-bindings/render.php
@@ -102,6 +102,16 @@ public function data_update_block_with_value_from_source() {
 				,
 				'<div class="wp-block-button"><a class="wp-block-button__link wp-element-button">test source value</a></div>',
 			),
+			'image block'     => array(
+				'caption',
+				<<<HTML
+<!-- wp:image {"id":66,"sizeSlug":"large","linkDestination":"none"} -->
+<figure class="wp-block-image size-large"><img src="breakfast.jpg" alt="" class="wp-image-1"/><figcaption class="wp-element-caption">Breakfast at a <em>café</em> in Wrocław.</figcaption></figure>
+<!-- /wp:image -->
+HTML
+			,
+				'<figure class="wp-block-image size-large"><img src="breakfast.jpg" alt="" class="wp-image-1"/><figcaption class="wp-element-caption">test source value</figcaption></figure>',
+			),
 			'test block'      => array(
 				'myAttribute',
 				<<<HTML
@@ -282,13 +292,21 @@ public function test_passing_uses_context_to_source() {
 	 * Tests if the block content is updated with the value returned by the source
 	 * for the Image block in the placeholder state.
 	 *
+	 * Furthermore tests if the caption attribute is correctly processed.
+	 *
 	 * @ticket 60282
+	 * @ticket 64031
 	 *
 	 * @covers ::register_block_bindings_source
 	 */
 	public function test_update_block_with_value_from_source_image_placeholder() {
-		$get_value_callback = function () {
-			return 'https://example.com/image.jpg';
+		$get_value_callback = function ( $source_args, $block_instance, $attribute_name ) {
+			if ( 'url' === $attribute_name ) {
+				return 'https://example.com/image.jpg';
+			}
+			if ( 'caption' === $attribute_name ) {
+				return 'Example Image';
+			}
 		};
 
 		register_block_bindings_source(
@@ -300,8 +318,8 @@ public function test_update_block_with_value_from_source_image_placeholder() {
 		);
 
 		$block_content = <<<HTML
-<!-- wp:image {"metadata":{"bindings":{"url":{"source":"test/source"}}}} -->
-<figure class="wp-block-image"><img alt=""/></figure>
+<!-- wp:image {"metadata":{"bindings":{"url":{"source":"test/source"},"caption":{"source":"test/source"}}}} -->
+<figure class="wp-block-image"><img alt=""/><figcaption class="wp-element-caption"></figcaption></figure>
 <!-- /wp:image -->
 HTML;
 		$parsed_blocks = parse_blocks( $block_content );
@@ -314,7 +332,12 @@ public function test_update_block_with_value_from_source_image_placeholder() {
 			"The 'url' attribute should be updated with the value returned by the source."
 		);
 		$this->assertSame(
-			'<figure class="wp-block-image"><img src="https://example.com/image.jpg" alt=""/></figure>',
+			'Example Image',
+			$block->attributes['caption'],
+			"The 'caption' attribute should be updated with the value returned by the source."
+		);
+		$this->assertSame(
+			'<figure class="wp-block-image"><img src="https://example.com/image.jpg" alt=""/><figcaption class="wp-element-caption">Example Image</figcaption></figure>',
 			trim( $result ),
 			'The block content should be updated with the value returned by the source.'
 		);
