diff --git a/Gemfile.lock b/Gemfile.lock
index 0a31d88..54a53c1 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -169,7 +169,7 @@ GEM
       sass (~> 3.6)
       sqlite3 (~> 1.3)
       xcinvoke (~> 0.3.0)
-    json (2.2.0)
+    json (2.3.1)
     jwt (2.1.0)
     kramdown (2.1.0)
     kramdown-parser-gfm (1.1.0)