diff --git a/Gemfile.lock b/Gemfile.lock
index 99b88001..defaa75e 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -52,7 +52,7 @@ GEM
     codecov (0.6.0)
       simplecov (>= 0.15, < 0.22)
     coderay (1.1.3)
-    concurrent-ruby (1.3.5)
+    concurrent-ruby (1.3.6)
     connection_pool (2.5.4)
     diff-lcs (1.6.2)
     docile (1.4.1)