Change from int to bigint?

We have an int custom field that we've stored an id in for years that is generated in another external system/org and we don't control. We had a sync error (Value was either too large or too small for an Int32) and traced it back to them using a different range outside of the limits for an int and we're now having to decide how to handle these.  I know we can extend columns if they're too small.  But is it supported to change data types from int to bigint?

I'm leaning towards just creating a new string column but figured I'd ask to do my due diligence on options as I didn't see any similar question. 

Thanks!

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