diff --git a/Gemfile.lock b/Gemfile.lock
index d54abcd..9a4eb50 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -5,7 +5,7 @@ GEM
     commander (4.4.7)
       highline (~> 2.0.0)
     highline (2.0.2)
-    json (2.2.0)
+    json (2.3.1)
     multi_json (1.13.1)
     mustermann (1.0.3)
     rack (2.0.7)