diff --git a/Gemfile.lock b/Gemfile.lock
index 9cd5ad9..84b1295 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -48,7 +48,7 @@ GEM
     codecov (0.6.0)
       simplecov (>= 0.15, < 0.22)
     coderay (1.1.3)
-    concurrent-ruby (1.2.3)
+    concurrent-ruby (1.3.1)
     console (1.15.3)
       fiber-local
     diff-lcs (1.5.1)