diff --git a/Gemfile.lock b/Gemfile.lock
index 258a16f..ec2c55c 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -12,7 +12,7 @@ GEM
       ffi (>= 1.0.0)
     rake (0.9.2)
     rcov (0.9.11)
-    yard (0.7.4)
+    yard (0.9.20)
 
 PLATFORMS
   ruby