diff --git a/Gemfile.lock b/Gemfile.lock
index 4603be2..f6e12fe 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -147,7 +147,7 @@ GEM
       sass (~> 3.4)
       sqlite3 (~> 1.3)
       xcinvoke (~> 0.3.0)
-    json (2.1.0)
+    json (2.3.1)
     jwt (2.1.0)
     liferaft (0.0.6)
     memoist (0.16.0)