diff --git a/Gemfile b/Gemfile
index 91a581963..3971be63a 100644
--- a/Gemfile
+++ b/Gemfile
@@ -8,6 +8,7 @@ LOCAL_GEMS = "Gemfile.local"
 gem "appraisal",        ">= 2.2"
 gem "rspec-eventually", require: false
 gem "rspec-its",        require: false
+gem "rack", '2.2.1'
 
 platforms :jruby do
   gem "pry-debugger-jruby"
diff --git a/gemfiles/sidekiq_4.0.gemfile b/gemfiles/sidekiq_4.0.gemfile
index 3ccac81ac..73d188546 100644
--- a/gemfiles/sidekiq_4.0.gemfile
+++ b/gemfiles/sidekiq_4.0.gemfile
@@ -5,6 +5,7 @@ source "https://rubygems.org"
 gem "appraisal", ">= 2.2"
 gem "rspec-eventually", require: false
 gem "rspec-its", require: false
+gem "rack", "2.2.1"
 gem "sidekiq", "~> 4.0.0"
 
 platforms :jruby do
diff --git a/gemfiles/sidekiq_4.1.gemfile b/gemfiles/sidekiq_4.1.gemfile
index 5aab36faf..3d6963f85 100644
--- a/gemfiles/sidekiq_4.1.gemfile
+++ b/gemfiles/sidekiq_4.1.gemfile
@@ -5,6 +5,7 @@ source "https://rubygems.org"
 gem "appraisal", ">= 2.2"
 gem "rspec-eventually", require: false
 gem "rspec-its", require: false
+gem "rack", "2.2.1"
 gem "sidekiq", "~> 4.1.0"
 
 platforms :jruby do
diff --git a/gemfiles/sidekiq_4.2.gemfile b/gemfiles/sidekiq_4.2.gemfile
index 25f6ea032..173875ebe 100644
--- a/gemfiles/sidekiq_4.2.gemfile
+++ b/gemfiles/sidekiq_4.2.gemfile
@@ -5,6 +5,7 @@ source "https://rubygems.org"
 gem "appraisal", ">= 2.2"
 gem "rspec-eventually", require: false
 gem "rspec-its", require: false
+gem "rack", "2.2.1"
 gem "sidekiq", "~> 4.2.0"
 
 platforms :jruby do
diff --git a/gemfiles/sidekiq_5.0.gemfile b/gemfiles/sidekiq_5.0.gemfile
index 1e47d86c1..cee33178f 100644
--- a/gemfiles/sidekiq_5.0.gemfile
+++ b/gemfiles/sidekiq_5.0.gemfile
@@ -5,6 +5,7 @@ source "https://rubygems.org"
 gem "appraisal", ">= 2.2"
 gem "rspec-eventually", require: false
 gem "rspec-its", require: false
+gem "rack", "2.2.1"
 gem "sidekiq", "~> 5.0.0"
 
 platforms :jruby do
diff --git a/gemfiles/sidekiq_5.1.gemfile b/gemfiles/sidekiq_5.1.gemfile
index b0000f8e5..d270d826a 100644
--- a/gemfiles/sidekiq_5.1.gemfile
+++ b/gemfiles/sidekiq_5.1.gemfile
@@ -5,6 +5,7 @@ source "https://rubygems.org"
 gem "appraisal", ">= 2.2"
 gem "rspec-eventually", require: false
 gem "rspec-its", require: false
+gem "rack", "2.2.1"
 gem "sidekiq", "~> 5.1.0"
 
 platforms :jruby do
diff --git a/gemfiles/sidekiq_5.2.gemfile b/gemfiles/sidekiq_5.2.gemfile
index eee73e563..7a36f1e5a 100644
--- a/gemfiles/sidekiq_5.2.gemfile
+++ b/gemfiles/sidekiq_5.2.gemfile
@@ -5,6 +5,7 @@ source "https://rubygems.org"
 gem "appraisal", ">= 2.2"
 gem "rspec-eventually", require: false
 gem "rspec-its", require: false
+gem "rack", "2.2.1"
 gem "sidekiq", "~> 5.2.0"
 
 platforms :jruby do
diff --git a/gemfiles/sidekiq_6.0.gemfile b/gemfiles/sidekiq_6.0.gemfile
index f35dc7d82..06afc1086 100644
--- a/gemfiles/sidekiq_6.0.gemfile
+++ b/gemfiles/sidekiq_6.0.gemfile
@@ -5,6 +5,7 @@ source "https://rubygems.org"
 gem "appraisal", ">= 2.2"
 gem "rspec-eventually", require: false
 gem "rspec-its", require: false
+gem "rack", "2.2.1"
 gem "sidekiq", ">= 6.0.pre", "< 6.1"
 
 platforms :jruby do
diff --git a/gemfiles/sidekiq_develop.gemfile b/gemfiles/sidekiq_develop.gemfile
index 6752b5aff..a0092e94d 100644
--- a/gemfiles/sidekiq_develop.gemfile
+++ b/gemfiles/sidekiq_develop.gemfile
@@ -5,6 +5,7 @@ source "https://rubygems.org"
 gem "appraisal", ">= 2.2"
 gem "rspec-eventually", require: false
 gem "rspec-its", require: false
+gem "rack", "2.2.1"
 gem "sidekiq", git: "https://github.com/mperham/sidekiq.git"
 
 platforms :jruby do