diff --git a/Gemfile.lock b/Gemfile.lock
index 7440e5e..770778c 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -298,7 +298,7 @@ GEM
     websocket-extensions (0.1.3)
     xpath (3.1.0)
       nokogiri (~> 1.8)
-    yard (0.9.16)
+    yard (0.9.20)
 
 PLATFORMS
   ruby