Rails reCaptcha gem - Not accepting theme option identified in Google's docs

I’m using the recaptcha gem (github.com/ambethia/recaptcha) but have
been
unable to change from the default theme. The google documentation
indicates
that there are four base themes, one of which is ‘white’. The
recaptcha_tags docs
identify a :display option:

:display - Takes a hash containing the theme and tabindex options 

per the API. (default nil)

I’m calling the function this way:

<%= recaptcha_tags :display => { :theme => "white" } %>

But I only get the default theme, not the white theme. I inserted a
puts()
into the source of the recaptcha gem where the options are parsed and
get
the following:

Options: {:public_key=>"XXXXXXXXXXXXX-YYYYYYYYYYYYYYY", 

:error=>“expression”}

I’ve tried every variation I can think of to pass a :display option with
a
hash of :theme => “white” and can’t get it to work. What am I doing
wrong
here?

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