diff --git a/Gemfile.lock b/Gemfile.lock
index 3b9e968..0d14185 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -16,7 +16,7 @@ GEM
       coffee-script-source
       execjs
     coffee-script-source (1.12.2)
-    concurrent-ruby (1.3.4)
+    concurrent-ruby (1.3.7)
     contracts (0.16.1)
     dotenv (2.8.1)
     erubis (2.7.0)