diff --git a/vnet/Gemfile.lock b/vnet/Gemfile.lock
index f1cf21cca..dc8a633ac 100644
--- a/vnet/Gemfile.lock
+++ b/vnet/Gemfile.lock
@@ -102,7 +102,7 @@ GEM
       concurrent-ruby (~> 1.0)
     ipaddress (0.8.3)
     jaro_winkler (1.5.1)
-    json (2.1.0)
+    json (2.3.1)
     kgio (2.11.2)
     method_source (0.9.0)
     minitest (5.11.3)