Use MultiJson

lib/packagecloud/client.rb

@@ -83,7 +83,7 @@ module Packagecloud
       assert_valid_repo_name(repo)
       privacy = private ? 1 : 0
       body = { "repository" => { "name" => repo, "private" => privacy.to_s } }
-      response = post("/api/v1/repos.json", body.to_json)
+      response = post("/api/v1/repos.json", MultiJson.dump(body))
       parsed_json_result(response)
     end

spec/packagecloud_spec.rb

@@ -167,7 +167,7 @@ describe Packagecloud do
   end
   it "POST /api/v1/repos.json" do
-    body = { "repository" => { "name" => "my_repo", "private" => "0" } }.to_json
+    body = MultiJson.dump({ "repository" => { "name" => "my_repo", "private" => "0" } })
     result = @client.create_repository("my_repo")
     expect(result.succeeded).to be_truthy
     expect($request.content_type).to include("json")