diff --git a/Gemfile.lock b/Gemfile.lock
index fb6ff8d..70e611e 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -20,7 +20,7 @@ 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)
     date (3.4.1)
     diff-lcs (1.5.1)