How to update Captcha 1 into version 2

On my contacts page the captcha is showing being out of date.

I cannot remember how I inserted the captcha. How do I update it to version 2.

I went to my Google account and generated new keys.
I then went to Wordpress / appearances / theme options / contact options. I entered the new keys.

However the old captcha is still showing.

I really appreciate feedback on which steps I’m missing.

Many thanks,

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