diff --git a/Gemfile.lock b/Gemfile.lock
index dcac903..6913769 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -17,7 +17,7 @@ GEM
     base64 (0.3.0)
     benchmark (0.5.0)
     bigdecimal (4.0.1)
-    concurrent-ruby (1.3.6)
+    concurrent-ruby (1.3.7)
     connection_pool (3.0.2)
     docile (1.4.0)
     drb (2.2.3)