diff --git a/Rakefile b/Rakefile
index c08f73b..d04190d 100644
--- a/Rakefile
+++ b/Rakefile
@@ -27,6 +27,7 @@ namespace :test do
 
   desc 'Run all tests with appraisal'
   task :all do
+    sh 'bundle exec appraisal install'
     sh 'bundle exec appraisal rake test'
   end
 end