Kibana Update

Hello everybody,
I should update my kibana version so that we can use mathematical functions at work, our Kibana version is 4.5.3 and elasticsearch version is 2.3.4.
I searched in internet and found ==>
and then as i understood I have to talk to Kibana because of that...I have installed Postman and for first step tried ==>"http: // devvs129: 5601 / _snapshot / my_backup"
ande in Key -H in Value kbn-version:4.5.3
but then I have the error message =>

"statusCode": 400,
"error": "Bad Request",
"message": "Missing kbn-version header"

am very happy if someone can help me with this,ELK is a newland for me :frowning:
sorry for my bad English language...
Thanks in advance

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