diff --git a/src/Client.php b/src/Client.php
index e53e88e73..d0cffa44b 100644
--- a/src/Client.php
+++ b/src/Client.php
@@ -49,7 +49,7 @@
  */
 class Client
 {
-  const LIBVER = "2.9.0";
+  const LIBVER = "2.9.1";
   const USER_AGENT_SUFFIX = "google-api-php-client/";
   const OAUTH2_REVOKE_URI = 'https://oauth2.googleapis.com/revoke';
   const OAUTH2_TOKEN_URI = 'https://oauth2.googleapis.com/token';