diff --git a/Gemfile.lock b/Gemfile.lock
index 5ab1e86..331abd7 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -15,7 +15,7 @@ GEM
     coffee-script-source (1.12.2)
     colorator (1.1.0)
     commonmarker (0.23.10)
-    concurrent-ruby (1.3.4)
+    concurrent-ruby (1.3.7)
     connection_pool (2.4.1)
     crass (1.0.6)
     csv (3.3.0)