diff --git a/core/Gemfile.lock b/core/Gemfile.lock
index 526d869f..3616bfba 100644
--- a/core/Gemfile.lock
+++ b/core/Gemfile.lock
@@ -382,7 +382,7 @@ GEM
       sprockets-rails (>= 2.0, < 4.0)
     websocket-driver (0.6.5)
       websocket-extensions (>= 0.1.0)
-    websocket-extensions (0.1.3)
+    websocket-extensions (0.1.5)
     xpath (3.2.0)
       nokogiri (~> 1.8)