diff --git a/Gemfile.lock b/Gemfile.lock
index d4bb155..24e4c08 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -103,7 +103,7 @@ GEM
       unicode-display_width (~> 1.1, >= 1.1.1)
     thor (0.20.0)
     unicode-display_width (1.3.0)
-    yard (0.9.12)
+    yard (0.9.20)
 
 PLATFORMS
   ruby