diff --git a/Gemfile.lock b/Gemfile.lock
index bc30eb0..9c8e4cf 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -88,7 +88,7 @@ GEM
     base64 (0.3.0)
     bigdecimal (4.0.1)
     builder (3.3.0)
-    concurrent-ruby (1.3.6)
+    concurrent-ruby (1.3.7)
     connection_pool (3.0.2)
     crack (1.0.1)
       bigdecimal