diff --git a/Gemfile.lock b/Gemfile.lock
index 65d9bc3..cb81d1c 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -50,7 +50,7 @@ GEM
       addressable (>= 2.3.6)
       crack (>= 0.3.2)
       hashdiff
-    yard (0.9.9)
+    yard (0.9.20)
 
 PLATFORMS
   ruby