diff --git a/LTI-Introduction/Gemfile.lock b/LTI-Introduction/Gemfile.lock
index d7133a2..9af2c0d 100644
--- a/LTI-Introduction/Gemfile.lock
+++ b/LTI-Introduction/Gemfile.lock
@@ -172,7 +172,7 @@ GEM
       railties (>= 5.0)
     websocket-driver (0.6.5)
       websocket-extensions (>= 0.1.0)
-    websocket-extensions (0.1.3)
+    websocket-extensions (0.1.5)
     xpath (3.0.0)
       nokogiri (~> 1.8)