diff --git a/.travis.yml b/.travis.yml
index 2bad746..69d264c 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -4,6 +4,7 @@ xcode_workspace: Example/PerspectiveTransform.xcworkspace
 xcode_scheme: Framework Unit Specs
 xcode_sdk: iphonesimulator11.2
 gemfile: Example/Gemfile
+cache: bundler
 before_install:
   - carthage version
   - bundle install
diff --git a/Gemfile.lock b/Gemfile.lock
index 3103938..d5955db 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -81,8 +81,5 @@ DEPENDENCIES
   cocoapods
   slather
 
-RUBY VERSION
-   ruby 2.4.1p111
-
 BUNDLED WITH
    1.16.1