diff --git a/temp_file/Gemfile b/temp_file/Gemfile
index 20d68c9..8494388 100644
--- a/temp_file/Gemfile
+++ b/temp_file/Gemfile
@@ -171,6 +171,9 @@ if RUBY_VERSION.to_f == 2.1
     gem 'minitest-spec-rails'
   end
 else
+  if RUBY_VERSION.to_f >= 2.5
+    gem 'psych', '4.0.6'
+  end
   gem 'sorted_set'
   gem 'faraday'
   gem 'ffi', '1.14.2'