diff --git a/example/Gemfile.lock b/example/Gemfile.lock
index e67e2dc..14f9c95 100644
--- a/example/Gemfile.lock
+++ b/example/Gemfile.lock
@@ -8,7 +8,7 @@ GEM
       i18n
       rake (>= 10.0.0)
       sshkit (>= 1.9.0)
-    concurrent-ruby (1.1.8)
+    concurrent-ruby (1.3.7)
     i18n (1.8.10)
       concurrent-ruby (~> 1.0)
     net-scp (3.0.0)