diff --git a/Gemfile.lock b/Gemfile.lock
index f2557c91..8c3a747c 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -21,7 +21,7 @@ GEM
       ffi (>= 1.0.0)
       rake
     jaro_winkler (1.5.1)
-    json (2.1.0)
+    json (2.3.1)
     method_source (0.9.0)
     minitest (5.11.3)
     parallel (1.12.1)