diff --git a/Gemfile.lock b/Gemfile.lock
index 4f17b7a81ade810d82040d98199c579d874ebeb6..bcedeff385c5c55442eba14ebc6710cf634e431a 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -32,7 +32,6 @@ PATH
     actioncable (5.0.0.beta1)
       actionpack (= 5.0.0.beta1)
       coffee-rails (~> 4.1.0)
-      concurrent-ruby (~> 1.0.0)
       em-hiredis (~> 0.3.0)
       faye-websocket (~> 0.10.0)
       redis (~> 3.0)
@@ -145,7 +144,7 @@ GEM
       eventmachine (~> 1.0)
       hiredis (~> 0.5.0)
     erubis (2.7.0)
-    eventmachine (1.0.8)
+    eventmachine (1.0.9.1)
     execjs (2.6.0)
     faye-websocket (0.10.2)
       eventmachine (>= 0.12.0)