Gemfile in rbs-1.5.1 vs Gemfile in rbs-1.6.0

@@ -14,9 +14,10 @@
 gem "json-schema"
 gem 'stackprof'
 gem "goodcheck"
 gem "dbm"
 gem 'digest'
+gem 'tempfile'
 
 # Test gems
 gem "rbs-amber", path: "test/assets/test-gem"
 
 group :ide, optional: true do