diff --git a/wp-includes/components/class-wp-service-worker-navigation-routing-component.php b/wp-includes/components/class-wp-service-worker-navigation-routing-component.php
index a539f176f..f800c3798 100644
--- a/wp-includes/components/class-wp-service-worker-navigation-routing-component.php
+++ b/wp-includes/components/class-wp-service-worker-navigation-routing-component.php
@@ -63,9 +63,9 @@ public function serve( WP_Service_Worker_Scripts $scripts ) {
 
 		$revision = PWA_VERSION;
 
-		$revision .= sprintf( ';%s=%s', $template, wp_get_theme( $template )->Version );
+		$revision .= sprintf( ';%s=%s', $template, wp_get_theme( $template )->version );
 		if ( $template !== $stylesheet ) {
-			$revision .= sprintf( ';%s=%s', $stylesheet, wp_get_theme( $stylesheet )->Version );
+			$revision .= sprintf( ';%s=%s', $stylesheet, wp_get_theme( $stylesheet )->version );
 		}
 
 		// Ensure the user-specific offline/500 pages are precached, and that they update when user logs out or switches to another user.