diff --git a/google-apis-core/lib/google/apis/core/version.rb b/google-apis-core/lib/google/apis/core/version.rb
index 27df9d78159..68d2d093810 100644
--- a/google-apis-core/lib/google/apis/core/version.rb
+++ b/google-apis-core/lib/google/apis/core/version.rb
@@ -16,7 +16,7 @@ module Google
   module Apis
     module Core
       # Core version
-      VERSION = "1.2.1".freeze
+      VERSION = "1.2.99".freeze
     end
   end
 end