diff --git a/Gemfile.lock b/Gemfile.lock
index 6118b8c..ea8c795 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -436,7 +436,7 @@ GEM
     websocket-extensions (0.1.3)
     xpath (3.2.0)
       nokogiri (~> 1.8)
-    yard (0.9.18)
+    yard (0.9.20)
 
 PLATFORMS
   ruby