diff --git a/spec/dummy/Gemfile.lock b/spec/dummy/Gemfile.lock
index ef2dccb..98c81fd 100644
--- a/spec/dummy/Gemfile.lock
+++ b/spec/dummy/Gemfile.lock
@@ -73,7 +73,7 @@ GEM
     builder (3.2.4)
     byebug (11.1.3)
     coderay (1.1.3)
-    concurrent-ruby (1.3.1)
+    concurrent-ruby (1.3.7)
     crass (1.0.6)
     date (3.3.4)
     diff-lcs (1.5.1)