diff --git a/Gemfile.lock b/Gemfile.lock
index c2c95ca..f9cd251 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -7,7 +7,7 @@ GEM
   remote: https://rubygems.org/
   specs:
     ffi2-generators (0.1.1)
-    json (1.8.1)
+    json (1.8.3)
     minitest (5.5.0)
     rake (10.4.2)
     rake-compiler (0.8.3)