diff --git a/week4/sample_app/Gemfile.lock b/week4/sample_app/Gemfile.lock
index 1816408..9eb890c 100644
--- a/week4/sample_app/Gemfile.lock
+++ b/week4/sample_app/Gemfile.lock
@@ -198,7 +198,7 @@ GEM
       railties (>= 5.0)
     websocket-driver (0.6.5)
       websocket-extensions (>= 0.1.0)
-    websocket-extensions (0.1.3)
+    websocket-extensions (0.1.5)
 
 PLATFORMS
   ruby