diff --git a/src/wp-includes/class-wp-theme-json.php b/src/wp-includes/class-wp-theme-json.php
index eb803c42ea..30c24173f4 100644
--- a/src/wp-includes/class-wp-theme-json.php
+++ b/src/wp-includes/class-wp-theme-json.php
@@ -304,7 +304,8 @@ class WP_Theme_JSON {
 	 *              and `typography`, and renamed others according to the new schema.
 	 * @since 6.0.0 Added `color.defaultDuotone`.
 	 * @since 6.1.0 Added `layout.definitions` and `useRootPaddingAwareAlignments`.
-	 * @since 6.2.0 Added `dimensions.minHeight`, 'shadow.presets', and 'shadow.defaultPresets'.
+	 * @since 6.2.0 Added `dimensions.minHeight`, 'shadow.presets', 'shadow.defaultPresets',
+	 *              `position.fixed` and `position.sticky`.
 	 * @var array
 	 */
 	const VALID_SETTINGS = array(
@@ -339,6 +340,10 @@ class WP_Theme_JSON {
 			'definitions' => null,
 			'wideSize'    => null,
 		),
+		'position'                      => array(
+			'fixed'  => null,
+			'sticky' => null,
+		),
 		'spacing'                       => array(
 			'customSpacingSize' => null,
 			'spacingSizes'      => null,
@@ -513,7 +518,7 @@ class WP_Theme_JSON {
 	 * Options that settings.appearanceTools enables.
 	 *
 	 * @since 6.0.0
-	 * @since 6.2.0 Added `dimensions.minHeight`.
+	 * @since 6.2.0 Added `dimensions.minHeight` and `position.sticky`.
 	 * @var array
 	 */
 	const APPEARANCE_TOOLS_OPT_INS = array(
@@ -523,6 +528,7 @@ class WP_Theme_JSON {
 		array( 'border', 'width' ),
 		array( 'color', 'link' ),
 		array( 'dimensions', 'minHeight' ),
+		array( 'position', 'sticky' ),
 		array( 'spacing', 'blockGap' ),
 		array( 'spacing', 'margin' ),
 		array( 'spacing', 'padding' ),
diff --git a/src/wp-settings.php b/src/wp-settings.php
index 231303ddbe..a11b07ca28 100644
--- a/src/wp-settings.php
+++ b/src/wp-settings.php
@@ -336,6 +336,7 @@ require ABSPATH . WPINC . '/block-supports/duotone.php';
 require ABSPATH . WPINC . '/block-supports/elements.php';
 require ABSPATH . WPINC . '/block-supports/generated-classname.php';
 require ABSPATH . WPINC . '/block-supports/layout.php';
+require ABSPATH . WPINC . '/block-supports/position.php';
 require ABSPATH . WPINC . '/block-supports/spacing.php';
 require ABSPATH . WPINC . '/block-supports/typography.php';
 require ABSPATH . WPINC . '/block-supports/settings.php';
diff --git a/tests/phpunit/tests/theme/wpThemeJson.php b/tests/phpunit/tests/theme/wpThemeJson.php
index 79d5b1d779..b2d05d9fe3 100644
--- a/tests/phpunit/tests/theme/wpThemeJson.php
+++ b/tests/phpunit/tests/theme/wpThemeJson.php
@@ -274,6 +274,9 @@ class Tests_Theme_wpThemeJson extends WP_UnitTestCase {
 			'dimensions' => array(
 				'minHeight' => true,
 			),
+			'position'   => array(
+				'sticky' => true,
+			),
 			'spacing'    => array(
 				'blockGap' => false,
 				'margin'   => true,
@@ -301,6 +304,9 @@ class Tests_Theme_wpThemeJson extends WP_UnitTestCase {
 					'dimensions' => array(
 						'minHeight' => true,
 					),
+					'position'   => array(
+						'sticky' => true,
+					),
 					'spacing'    => array(
 						'blockGap' => false,
 						'margin'   => true,