diff --git a/wp-includes/rest-api.php b/wp-includes/rest-api.php
index be21f554b6..c28d7415de 100644
--- a/wp-includes/rest-api.php
+++ b/wp-includes/rest-api.php
@@ -1579,7 +1579,7 @@ function rest_validate_value_from_schema( $value, $args, $param = '' ) {
 		_doing_it_wrong(
 			__FUNCTION__,
 			/* translators: 1. Parameter 2. The list of allowed types. */
-			wp_sprintf( __( 'The "type" schema keyword for %1$s can only be on of the built-in types: %2$l.' ), $param, $allowed_types ),
+			wp_sprintf( __( 'The "type" schema keyword for %1$s can only be one of the built-in types: %2$l.' ), $param, $allowed_types ),
 			'5.5.0'
 		);
 	}
@@ -1849,7 +1849,7 @@ function rest_sanitize_value_from_schema( $value, $args, $param = '' ) {
 		_doing_it_wrong(
 			__FUNCTION__,
 			/* translators: 1. Parameter. 2. The list of allowed types. */
-			wp_sprintf( __( 'The "type" schema keyword for %1$s can only be on of the built-in types: %2$l.' ), $param, $allowed_types ),
+			wp_sprintf( __( 'The "type" schema keyword for %1$s can only be one of the built-in types: %2$l.' ), $param, $allowed_types ),
 			'5.5.0'
 		);
 	}
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 9274287cb0..d28fd91df4 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.5-RC2-48763';
+$wp_version = '5.5-RC2-48768';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.