diff --git a/demo_app/Gemfile.lock b/demo_app/Gemfile.lock
index 2bb7a8a..8feb89a 100644
--- a/demo_app/Gemfile.lock
+++ b/demo_app/Gemfile.lock
@@ -96,13 +96,15 @@ GEM
     marcel (0.3.3)
       mimemagic (~> 0.3.2)
     method_source (0.9.2)
-    mimemagic (0.3.3)
+    mimemagic (0.3.10)
+      nokogiri (~> 1)
+      rake
     mini_mime (1.0.2)
     mini_portile2 (2.4.0)
     minitest (5.11.3)
     msgpack (1.3.1)
     nio4r (2.5.1)
-    nokogiri (1.10.4)
+    nokogiri (1.10.10)
       mini_portile2 (~> 2.4.0)
     public_suffix (4.0.1)
     puma (3.12.1)