diff --git a/Gemfile.lock b/Gemfile.lock
index 61507c3a..c005e13e 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -97,7 +97,7 @@ GEM
       xpath (~> 3.2)
     childprocess (3.0.0)
     coderay (1.1.3)
-    concurrent-ruby (1.1.9)
+    concurrent-ruby (1.3.7)
     crack (0.4.5)
       rexml
     crass (1.0.6)