diff --git a/Gemfile.lock b/Gemfile.lock
index f2927d5..7b2d9e8 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -68,7 +68,7 @@ GEM
       eventmachine (~> 1.0, >= 1.0.4)
       rack (>= 1, < 3)
     tilt (2.0.5)
-    yard (0.9.5)
+    yard (0.9.20)
 
 PLATFORMS
   ruby