diff --git a/Chapter11/Exercise11.02/Gemfile.lock b/Chapter11/Exercise11.02/Gemfile.lock
index c5a8bf3..2012d62 100644
--- a/Chapter11/Exercise11.02/Gemfile.lock
+++ b/Chapter11/Exercise11.02/Gemfile.lock
@@ -172,7 +172,7 @@ GEM
       railties (>= 5.0)
     websocket-driver (0.7.1)
       websocket-extensions (>= 0.1.0)
-    websocket-extensions (0.1.4)
+    websocket-extensions (0.1.5)
     xpath (3.2.0)
       nokogiri (~> 1.8)