diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index 413d74c..151e88e 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -1,7 +1,6 @@
 # frozen_string_literal: true
 
 ENV["RACK_ENV"] = ENV["APP_ENV"] = "test"
-require "gem_server_conformance/server"
 require_relative "support/request_helpers"
 
 RSpec.configure do |config|
diff --git a/spec/support/request_helpers.rb b/spec/support/request_helpers.rb
index e486d30..7c1f34b 100644
--- a/spec/support/request_helpers.rb
+++ b/spec/support/request_helpers.rb
@@ -1,5 +1,7 @@
 # frozen_string_literal: true
 
+require "delegate"
+require "forwardable"
 require "rubygems/gemcutter_utilities"
 
 module RequestHelpers
diff --git a/spec/support/step_helpers.rb b/spec/support/step_helpers.rb
index 3fe6ba5..7e028f0 100644
--- a/spec/support/step_helpers.rb
+++ b/spec/support/step_helpers.rb
@@ -136,6 +136,8 @@ def define!
           before(:all) do
             @upstream = ENV.fetch("UPSTREAM", nil)
             unless upstream
+              require "gem_server_conformance/server"
+
               @upstream_output = Tempfile.create("upstream.out").path
               Bundler.with_original_env do
                 @upstream = "http://localhost:4567"