diff --git a/Gemfile.lock b/Gemfile.lock
index 9dac3c6..0c43cdb 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -21,7 +21,7 @@ GEM
       coffee-script-source
       execjs
     coffee-script-source (1.12.2)
-    concurrent-ruby (1.3.4)
+    concurrent-ruby (1.3.5)
     contracts (0.16.1)
     csv (3.3.0)
     dotenv (3.1.4)