diff --git a/Gemfile.lock b/Gemfile.lock
index dbfb0c5..ec79934 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -68,7 +68,7 @@ GEM
     unf (0.1.4)
       unf_ext
     unf_ext (0.0.7.4)
-    yard (0.9.12)
+    yard (0.9.20)
 
 PLATFORMS
   ruby