diff --git a/Gemfile.lock b/Gemfile.lock
index a5911068b7..30590c1ceb 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -34,7 +34,7 @@ GEM
       public_suffix (>= 2.0.2, < 7.0)
     afm (0.2.2)
     ansi (1.5.0)
-    async (2.21.0)
+    async (2.21.1)
       console (~> 1.29)
       fiber-annotation
       io-event (~> 1.6, >= 1.6.5)
@@ -126,7 +126,7 @@ GEM
     http_parser.rb (0.8.0)
     i18n (1.6.0)
       concurrent-ruby (~> 1.0)
-    io-event (1.7.3)
+    io-event (1.7.4)
     json (2.8.2)
     kramdown (2.5.1)
       rexml (>= 3.3.9)