diff --git a/Gemfile.lock b/Gemfile.lock
index be454b71..8b3bc8b5 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -14,7 +14,7 @@ GEM
       coffee-script-source
       execjs
     coffee-script-source (1.12.2)
-    concurrent-ruby (1.2.2)
+    concurrent-ruby (1.3.7)
     contracts (0.17)
     dotenv (2.8.1)
     erubis (2.7.0)