diff --git a/rack-tracker.gemspec b/rack-tracker.gemspec
index d5fa3d2..e68dfcb 100644
--- a/rack-tracker.gemspec
+++ b/rack-tracker.gemspec
@@ -28,6 +28,7 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency "rspec", "~> 3.2"
   spec.add_development_dependency "capybara", "~> 2.4"
   spec.add_development_dependency "pry"
+  spec.add_development_dependency "rack-session"
   if RUBY_VERSION < "2.0"
     spec.add_development_dependency "mime-types", "< 3.0"
     spec.add_development_dependency "addressable", "< 2.5"
diff --git a/spec/tracker/tracker_spec.rb b/spec/tracker/tracker_spec.rb
index 664e6c1..afbb4ce 100644
--- a/spec/tracker/tracker_spec.rb
+++ b/spec/tracker/tracker_spec.rb
@@ -1,4 +1,6 @@
 # frozen_string_literal: true
+require 'rack/session'
+
 class DummyHandler < Rack::Tracker::Handler
   def render
     Tilt.new( File.join( File.dirname(__FILE__), '../fixtures/dummy.erb') ).render(self)