diff --git a/Gemfile.lock b/Gemfile.lock
index 8c9d418..8f9bdec 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -19,7 +19,7 @@ GEM
     ffi (1.9.23)
     hamster (3.0.0)
       concurrent-ruby (~> 1.0)
-    json (2.1.0)
+    json (2.5.1)
     kramdown (1.16.2)
     libv8 (3.16.14.19)
     mini_portile2 (2.3.0)