diff --git a/Gemfile.lock b/Gemfile.lock
index df30351..7bfa410 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -24,6 +24,9 @@ GEM
     simplecov-html (0.12.3)
     simplecov_json_formatter (0.1.3)
 
+PLATFORMS
+  ruby
+
 DEPENDENCIES
   girocode!
   minitest