diff --git a/Gemfile.lock b/Gemfile.lock
index f5b8942f..34e8f2b6 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -76,7 +76,7 @@ GEM
     http_parser.rb (0.8.0)
     i18n (1.6.0)
       concurrent-ruby (~> 1.0)
-    io-event (1.2.3)
+    io-event (1.3.3)
     jmespath (1.6.2)
     kramdown (2.4.0)
       rexml