diff --git a/Gemfile.lock b/Gemfile.lock
index 30c837be..ff11258a 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -86,6 +86,7 @@ GEM
     babel-transpiler (0.7.0)
       babel-source (>= 4.0, < 6)
       execjs (~> 2.0)
+    base64 (0.3.0)
     builder (3.2.4)
     byebug (11.1.3)
     capybara (3.37.1)
@@ -250,7 +251,8 @@ GEM
     tzinfo (2.0.6)
       concurrent-ruby (~> 1.0)
     websocket (1.2.9)
-    websocket-driver (0.7.6)
+    websocket-driver (0.8.1)
+      base64
       websocket-extensions (>= 0.1.0)
     websocket-extensions (0.1.5)
     xpath (3.2.0)