diff --git a/wp-admin/includes/upgrade.php b/wp-admin/includes/upgrade.php
index 475608efa7..b558819771 100644
--- a/wp-admin/includes/upgrade.php
+++ b/wp-admin/includes/upgrade.php
@@ -832,6 +832,10 @@ function upgrade_all() {
 		upgrade_560();
 	}
 
+	if ( $wp_current_db_version < 51917 ) {
+		upgrade_590();
+	}
+
 	maybe_disable_link_manager();
 
 	maybe_disable_automattic_widgets();
@@ -2248,6 +2252,23 @@ function upgrade_560() {
 	}
 }
 
+/**
+ * Executes changes made in WordPress 5.9.0.
+ *
+ * @ignore
+ * @since 5.9.0
+ */
+function upgrade_590() {
+	global $wp_current_db_version;
+
+	if ( $wp_current_db_version < 51917 ) {
+		$crons = _get_cron_array();
+		// Remove errant `false` values, see #53950.
+		$crons = array_filter( $crons );
+		_set_cron_array( $crons );
+	}
+}
+
 /**
  * Executes network-level upgrade routines.
  *
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 47b53ae64d..9c0e89c590 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -16,14 +16,14 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.9-alpha-51916';
+$wp_version = '5.9-alpha-51917';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.
  *
  * @global int $wp_db_version
  */
-$wp_db_version = 49752;
+$wp_db_version = 51917;
 
 /**
  * Holds the TinyMCE version.