diff --git a/Gemfile.lock b/Gemfile.lock
index 73bd52d..4eeeb95 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -49,7 +49,7 @@ GEM
     sqlite3 (1.3.5)
     term-ansicolor (1.0.7)
     tzinfo (0.3.31)
-    yard (0.7.4)
+    yard (0.9.20)
 
 PLATFORMS
   ruby