ruby on railsでjsonの中身が文字化け（？）してしまう

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url = "https://api.syosetu.com/novelapi/api/"
query = { out: "json", ncode: "n6316bn" ,gzip: 5, of: "t-w-s-nt-gl-ga-e-l-g-k"} 
client = HTTPClient.new
response = client.get(url, query)
require 'zlib'
require 'stringio'
gz = Zlib::GzipReader.new(StringIO.new(response.body.to_s))
uncompressed_string = gz.read