diff --git a/Gemfile.lock b/Gemfile.lock
index 0651c08..f8ca41a 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -36,7 +36,8 @@ GEM
     sinatra-cross_origin (0.4.0)
     tilt (2.4.0)
     toml-rb (3.0.1)
-    websocket-driver (0.7.6)
+    websocket-driver (0.8.1)
+      base64
       websocket-extensions (>= 0.1.0)
     websocket-extensions (0.1.5)