diff --git a/Gemfile.lock b/Gemfile.lock
index d5af83e..5ce7503 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -32,14 +32,14 @@ GEM
     base64 (0.3.0)
     bigdecimal (4.1.2)
     coderay (1.1.3)
-    concurrent-ruby (1.3.7)
+    concurrent-ruby (1.3.8)
     connection_pool (3.0.2)
     diff-lcs (1.6.2)
     drb (2.2.3)
     i18n (1.15.2)
       concurrent-ruby (~> 1.0)
     io-console (0.8.2)
-    json (2.20.0)
+    json (2.21.1)
     logger (1.7.0)
     method_source (1.1.0)
     mini_portile2 (2.8.9)