diff --git a/Gemfile.lock b/Gemfile.lock
index 2dc4771..7ecb9b5 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -49,7 +49,7 @@ GEM
     bigdecimal (4.0.1)
     builder (3.3.0)
     cgi (0.5.1)
-    concurrent-ruby (1.3.6)
+    concurrent-ruby (1.3.7)
     connection_pool (2.5.5)
     crass (1.0.6)
     csv (3.3.5)