diff --git a/Gemfile.lock b/Gemfile.lock
index 4498ddb5..30f6ede4 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -73,7 +73,7 @@ GEM
     case_transform (0.2)
       activesupport
     coderay (1.1.3)
-    concurrent-ruby (1.2.3)
+    concurrent-ruby (1.3.7)
     crass (1.0.6)
     date (3.3.4)
     enumerations (2.5.3)