diff --git a/.travis.yml b/.travis.yml
index 0a151bc..3be689c 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -21,6 +21,8 @@ before_install:
   - gem install bundler
 
 gemfile:
+  - gemfiles/rack_2_0.gemfile
+  - gemfiles/rack_1_6.gemfile
   - gemfiles/rails_5_2.gemfile
   - gemfiles/rails_5_1.gemfile
   - gemfiles/rails_5_0.gemfile
diff --git a/Appraisals b/Appraisals
index 296b89c..7b03cd3 100644
--- a/Appraisals
+++ b/Appraisals
@@ -1,3 +1,11 @@
+appraise "rack_2_0" do
+  gem "rack", "~> 2.0.4"
+end
+
+appraise "rack_1_6" do
+  gem "rack", "~> 1.6.9"
+end
+
 appraise 'rails_5-2' do
   gem 'activesupport', '~> 5.2.0.a'
   gem 'actionpack', '~> 5.2.0.a'
diff --git a/gemfiles/rack_1_6.gemfile b/gemfiles/rack_1_6.gemfile
new file mode 100644
index 0000000..18b3acf
--- /dev/null
+++ b/gemfiles/rack_1_6.gemfile
@@ -0,0 +1,7 @@
+# This file was generated by Appraisal
+
+source "https://rubygems.org"
+
+gem "rack", "~> 1.6.9"
+
+gemspec path: "../"
diff --git a/gemfiles/rack_2_0.gemfile b/gemfiles/rack_2_0.gemfile
new file mode 100644
index 0000000..9915a10
--- /dev/null
+++ b/gemfiles/rack_2_0.gemfile
@@ -0,0 +1,7 @@
+# This file was generated by Appraisal
+
+source "https://rubygems.org"
+
+gem "rack", "~> 2.0.4"
+
+gemspec path: "../"
diff --git a/gemfiles/rails_5_2.gemfile b/gemfiles/rails_5_2.gemfile
index f1948ff..98ef9e7 100644
--- a/gemfiles/rails_5_2.gemfile
+++ b/gemfiles/rails_5_2.gemfile
@@ -5,10 +5,4 @@ source "https://rubygems.org"
 gem "activesupport", "~> 5.2.0.a"
 gem "actionpack", "~> 5.2.0.a"
 
-group :development do
-  gem "pry"
-  gem "guard"
-  gem "guard-minitest"
-end
-
 gemspec path: "../"