diff --git a/Gemfile.lock b/Gemfile.lock
index b1713b8ed6..e9a5ac9c82 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -5,7 +5,7 @@ GEM
     addressable (2.8.6)
       public_suffix (>= 2.0.2, < 6.0)
     afm (0.2.2)
-    async (2.8.0)
+    async (2.8.1)
       console (~> 1.10)
       fiber-annotation
       io-event (~> 1.1)