diff --git a/systemtap-tutorial-zh/Gemfile.lock b/systemtap-tutorial-zh/Gemfile.lock
index e900859..149b6ff 100644
--- a/systemtap-tutorial-zh/Gemfile.lock
+++ b/systemtap-tutorial-zh/Gemfile.lock
@@ -79,7 +79,7 @@ GEM
       activesupport (>= 3.1)
     parallel (1.19.1)
     public_suffix (4.0.6)
-    rack (2.2.6.4)
+    rack (2.2.9)
     rb-fsevent (0.10.4)
     rb-inotify (0.10.1)
       ffi (~> 1.0)