diff --git a/wp-includes/taxonomy.php b/wp-includes/taxonomy.php
index 7598e2a337..b46416bc16 100644
--- a/wp-includes/taxonomy.php
+++ b/wp-includes/taxonomy.php
@@ -626,7 +626,7 @@ function register_taxonomy_for_object_type( $taxonomy, $object_type ) {
 	/**
 	 * Fires after a taxonomy is registered for an object type.
 	 *
-	 * @since 4.9.9
+	 * @since 5.1.0
 	 *
 	 * @param string $taxonomy    Taxonomy name.
 	 * @param string $object_type Name of the object type.
@@ -668,7 +668,7 @@ function unregister_taxonomy_for_object_type( $taxonomy, $object_type ) {
 	/**
 	 * Fires after a taxonomy is unregistered for an object type.
 	 *
-	 * @since 4.9.9
+	 * @since 5.1.0
 	 *
 	 * @param string $taxonomy    Taxonomy name.
 	 * @param string $object_type Name of the object type.
diff --git a/wp-includes/version.php b/wp-includes/version.php
index b1b1e0eeee..501ac4c01a 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.1-alpha-44320';
+$wp_version = '5.1-alpha-44321';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.