diff --git a/Gemfile.lock b/Gemfile.lock
index 5ff654f..7a3755b 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -18,7 +18,7 @@ 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)
     drb (2.2.3)
     hashie (5.1.0)