diff --git a/Gemfile.lock b/Gemfile.lock
index 0e8967a..b925dc0 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -48,7 +48,7 @@ GEM
     unf_ext (0.0.4)
     vcr (2.1.1)
     webrobots (0.0.13)
-    yard (0.8.1)
+    yard (0.9.20)
 
 PLATFORMS
   ruby