keep you updated正确。
释义：及时向你更新情况
短语：
I will keep you updated
我将和你保持联络 ; 我会及时更新给你
例句：
1、I am pondering living solely by the Food Rules for August so I will keep you updated on that.
我在考虑遵循用八月份的《食品规则》生活，因此，我将让你在这上面更新。
2、The Apple conference call will be starting soon and we’ll keep you updated with any additional information.
Apple大会即将召开，我们会随时更新详细信息。
3、I have added a new category for energy management in this blog as I hope to keep you updatedon what I find.
在这个博客我加入了一个精力管理的新类别，因为我希望你能随着我的发现不断更新。
4、A: I have taken note of your question. I do not have any information to provide at present, but the Spokesperson's Office will follow up this question and keep you updated.
答：我注意到你提的这个问题，目前我还没有可以向你提供的消息，但是发言人办公室会跟进这个问题，及时向你作出答复。
5、As for what agreements will be signed, I will keep you updated.
至于这次访问将会签署哪些协议，我将会适时发布消息。