diff --git a/Gemfile.lock b/Gemfile.lock
index 0c36f98b..c1e5a3ce 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -17,7 +17,7 @@ GEM
     addressable (2.8.6)
       public_suffix (>= 2.0.2, < 6.0)
     afm (0.2.2)
-    async (2.6.5)
+    async (2.8.0)
       console (~> 1.10)
       fiber-annotation
       io-event (~> 1.1)