How to maintain chapter number references using MS Word 2016

I am numbering my chapters using automatic numbering like

1. chapter 1

1.1 Subchapter 1

1.2 Subchapter 2

2. chapter 2

... etc.

I have to use references to chapter numbers in my text like

"It is describer in detail in chapter 1.2"

I use cross-links for this. Unfortunately, when I insert new subchapter 1.2, current subchapter 1.2 is renumbered to 1.3 (which is OK), but my cross reference shows still 1.2, instead of renumbered 1.3. Is there a way, how to have these in-document references renumbered together with auto numbers change?

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