There is an answer to my 
question: https://developers.google.com/protocol-buffers/docs/proto3#updating

On Wednesday, 14 December 2022 at 18:25:51 UTC+4 Pavel Patrin wrote:

> Hello everyone.
>
> I want to replace `int64` type to `uint64` type in proto file for field 
> that contains timestamp with milliseconds.
>
> The byte value length is 41 bit, and it is safe to do that in C.
>
> But what about protobuf with it's dynamic-size integers? Can I do such 
> replacement?
>

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