issues with deployment to us-east-2 region

[bennettatoms]

Hi there! I have been using s3_website for automated deployments to buckets in the us-east-1 region, and it's been working really well, so thanks! However, I have been trying to do the same for a bucket in the us-east-2 region, and I am getting the error:
[fail] Could not load the site: Unrecognised endpoint: us-east-2

Can someone help point me in the right direction? Here's what my yaml file looks like:

s3_id: <%= ENV['AWS_ACCESS_KEY_ID'] %>
s3_secret: <%= ENV['AWS_SECRET_ACCESS_KEY'] %>

# switch the following depending on desired
# branch/environment for deployment

<%
  if ENV['ENV'] == 'production'
    @s3_bucket = ENV['AWS_PRODUCTION_S3_BUCKET']
    @s3_endpoint = ENV['AWS_PRODUCTION_REGION']
  elsif ENV['ENV'] == 'staging'
    @s3_bucket = ENV['AWS_STAGING_S3_BUCKET']
    @s3_endpoint = ENV['AWS_STAGING_REGION']
  else
    @s3_bucket = ENV['AWS_DEVELOPMENT_S3_BUCKET']
    @s3_endpoint = ENV['AWS_DEVELOPMENT_REGION']
  end
%>

s3_bucket: <%= @s3_bucket %>
s3_endpoint: <%= @s3_endpoint %>

site: ./
// etc.