diff --git a/Gemfile.lock b/Gemfile.lock
index 1f300cef5..eacdbac6e 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -166,7 +166,7 @@ GEM
     logger (1.7.0)
     mini_magick (4.13.2)
     mini_mime (1.1.5)
-    multi_json (1.20.1)
+    multi_json (1.21.0)
     multipart-post (2.4.1)
     mutex_m (0.3.0)
     nanaimo (0.4.0)