diff --git a/Gemfile.lock b/Gemfile.lock
index 01b17b3..4eec779 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -25,7 +25,7 @@ GEM
       uri (>= 0.13.1)
     base64 (0.3.0)
     bigdecimal (4.1.2)
-    concurrent-ruby (1.3.6)
+    concurrent-ruby (1.3.7)
     connection_pool (3.0.2)
     diff-lcs (1.6.2)
     docile (1.4.1)