diff --git a/Gemfile.lock b/Gemfile.lock
index b6d6c3bc..1e85a4fc 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -138,7 +138,7 @@ GEM
     childprocess (3.0.0)
     chronic (0.10.2)
     coderay (1.1.3)
-    concurrent-ruby (1.1.8)
+    concurrent-ruby (1.1.9)
     crack (0.4.5)
       rexml
     crass (1.0.6)