diff --git a/Gemfile.lock b/Gemfile.lock
index 6a7c860..e0120cc 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -9,7 +9,7 @@ GEM
     base64 (0.3.0)
     builder (3.3.0)
     coderay (1.1.3)
-    concurrent-ruby (1.3.6)
+    concurrent-ruby (1.3.7)
     cri (2.15.12)
     ddmetrics (1.1.0)
     ddplugin (1.0.3)