diff --git a/.rubocop.yml b/.rubocop.yml
index eea40b4..59a1af4 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -7,12 +7,7 @@ AllCops:
   DisabledByDefault: true
   Exclude:
     - "examples/instrumentation.rb"
-    # Remove the following line once we are able to make bundler install gems to <PROJECT_ROOT>/vendor/bundle instead
-    # of <PROJECT_ROOT>/gemfiles/vendor/bundle during TravisCI builds. The reason that happens for now is because
-    # bundler 1.x only installs relative to the Gemfile (which during CI builds is always one inside gemfiles/ folder)
-    # instead of the CWD. Bundler 2.x will add support to install relative to CWD
-    # (see https://github.com/bundler/bundler/pull/5803).
-    - "gemfiles/vendor/**/*"
+    - "gemfiles/**/*"
 
 Bundler:
   Enabled: true
diff --git a/gemfiles/active_support_redis_cache_store.gemfile b/gemfiles/active_support_redis_cache_store.gemfile
index 040271b..30e1e38 100644
--- a/gemfiles/active_support_redis_cache_store.gemfile
+++ b/gemfiles/active_support_redis_cache_store.gemfile
@@ -1,5 +1,3 @@
-# frozen_string_literal: true
-
 # This file was generated by Appraisal
 
 source "https://rubygems.org"
diff --git a/gemfiles/active_support_redis_cache_store_pooled.gemfile b/gemfiles/active_support_redis_cache_store_pooled.gemfile
index 357ca42..9232a9b 100644
--- a/gemfiles/active_support_redis_cache_store_pooled.gemfile
+++ b/gemfiles/active_support_redis_cache_store_pooled.gemfile
@@ -1,5 +1,3 @@
-# frozen_string_literal: true
-
 # This file was generated by Appraisal
 
 source "https://rubygems.org"
diff --git a/gemfiles/active_support_redis_store.gemfile b/gemfiles/active_support_redis_store.gemfile
index 922f3cc..517c70f 100644
--- a/gemfiles/active_support_redis_store.gemfile
+++ b/gemfiles/active_support_redis_store.gemfile
@@ -1,5 +1,3 @@
-# frozen_string_literal: true
-
 # This file was generated by Appraisal
 
 source "https://rubygems.org"
diff --git a/gemfiles/connection_pool_dalli.gemfile b/gemfiles/connection_pool_dalli.gemfile
index 8c62b05..69dc887 100644
--- a/gemfiles/connection_pool_dalli.gemfile
+++ b/gemfiles/connection_pool_dalli.gemfile
@@ -1,5 +1,3 @@
-# frozen_string_literal: true
-
 # This file was generated by Appraisal
 
 source "https://rubygems.org"
diff --git a/gemfiles/dalli2.gemfile b/gemfiles/dalli2.gemfile
index 1628ad6..c47d5af 100644
--- a/gemfiles/dalli2.gemfile
+++ b/gemfiles/dalli2.gemfile
@@ -1,5 +1,3 @@
-# frozen_string_literal: true
-
 # This file was generated by Appraisal
 
 source "https://rubygems.org"
diff --git a/gemfiles/rack_1_6.gemfile b/gemfiles/rack_1_6.gemfile
index 91789b4..0cc0050 100644
--- a/gemfiles/rack_1_6.gemfile
+++ b/gemfiles/rack_1_6.gemfile
@@ -1,5 +1,3 @@
-# frozen_string_literal: true
-
 # This file was generated by Appraisal
 
 source "https://rubygems.org"
diff --git a/gemfiles/rack_2_0.gemfile b/gemfiles/rack_2_0.gemfile
index c7866b6..9915a10 100644
--- a/gemfiles/rack_2_0.gemfile
+++ b/gemfiles/rack_2_0.gemfile
@@ -1,5 +1,3 @@
-# frozen_string_literal: true
-
 # This file was generated by Appraisal
 
 source "https://rubygems.org"
diff --git a/gemfiles/rails_4_2.gemfile b/gemfiles/rails_4_2.gemfile
index 5e7dfe3..eb09083 100644
--- a/gemfiles/rails_4_2.gemfile
+++ b/gemfiles/rails_4_2.gemfile
@@ -1,5 +1,3 @@
-# frozen_string_literal: true
-
 # This file was generated by Appraisal
 
 source "https://rubygems.org"
diff --git a/gemfiles/rails_5_1.gemfile b/gemfiles/rails_5_1.gemfile
index bac5d16..d05d8e4 100644
--- a/gemfiles/rails_5_1.gemfile
+++ b/gemfiles/rails_5_1.gemfile
@@ -1,5 +1,3 @@
-# frozen_string_literal: true
-
 # This file was generated by Appraisal
 
 source "https://rubygems.org"
diff --git a/gemfiles/rails_5_2.gemfile b/gemfiles/rails_5_2.gemfile
index 1873512..d12b8c6 100644
--- a/gemfiles/rails_5_2.gemfile
+++ b/gemfiles/rails_5_2.gemfile
@@ -1,5 +1,3 @@
-# frozen_string_literal: true
-
 # This file was generated by Appraisal
 
 source "https://rubygems.org"
diff --git a/gemfiles/redis_3.gemfile b/gemfiles/redis_3.gemfile
index acf4e1a..403482c 100644
--- a/gemfiles/redis_3.gemfile
+++ b/gemfiles/redis_3.gemfile
@@ -1,5 +1,3 @@
-# frozen_string_literal: true
-
 # This file was generated by Appraisal
 
 source "https://rubygems.org"
diff --git a/gemfiles/redis_4.gemfile b/gemfiles/redis_4.gemfile
index 4372f71..701e936 100644
--- a/gemfiles/redis_4.gemfile
+++ b/gemfiles/redis_4.gemfile
@@ -1,5 +1,3 @@
-# frozen_string_literal: true
-
 # This file was generated by Appraisal
 
 source "https://rubygems.org"
diff --git a/gemfiles/redis_store.gemfile b/gemfiles/redis_store.gemfile
index 0ba921a..8aafc6d 100644
--- a/gemfiles/redis_store.gemfile
+++ b/gemfiles/redis_store.gemfile
@@ -1,5 +1,3 @@
-# frozen_string_literal: true
-
 # This file was generated by Appraisal
 
 source "https://rubygems.org"