diff --git a/Gemfile.lock b/Gemfile.lock
index 2a83c08..e31f7c9 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -31,7 +31,7 @@ GEM
     simplecov-html (0.8.0)
     slop (3.4.6)
     yajl-ruby (1.1.0)
-    yard (0.8.7)
+    yard (0.9.20)
 
 PLATFORMS
   ruby