diff --git a/wp-includes/version.php b/wp-includes/version.php
index d3c9490f99..3547e4a471 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.5-rc1';
+$wp_version = '5.5-RC1';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.