diff --git a/source/Gemfile.lock b/source/Gemfile.lock
index 7267402..465c2cf 100644
--- a/source/Gemfile.lock
+++ b/source/Gemfile.lock
@@ -225,7 +225,7 @@ GEM
       gemoji (~> 3.0)
       html-pipeline (~> 2.2)
       jekyll (~> 3.0)
-    json (2.2.0)
+    json (2.3.1)
     kramdown (1.17.0)
     latex-decode (0.3.1)
     liquid (4.0.0)