diff --git a/demos/cpuinfo/Gemfile.lock b/demos/cpuinfo/Gemfile.lock
index a343a44..3160c0a 100644
--- a/demos/cpuinfo/Gemfile.lock
+++ b/demos/cpuinfo/Gemfile.lock
@@ -20,7 +20,7 @@ GEM
       rspec-support (~> 3.6.0)
     rspec-support (3.6.0)
     tty-color (0.4.2)
-    yard (0.9.9)
+    yard (0.9.20)
 
 PLATFORMS
   ruby