diff --git a/Gemfile.lock b/Gemfile.lock
index 46dacc7..0e0c60f 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -8,7 +8,7 @@ GEM
   specs:
     ast (2.4.2)
     base64 (0.1.1)
-    concurrent-ruby (1.2.2)
+    concurrent-ruby (1.2.3)
     diff-lcs (1.5.0)
     docile (1.4.0)
     json (2.6.3)