diff --git a/mailit/Gemfile.lock b/mailit/Gemfile.lock
index 6a32aa6..51b7571 100644
--- a/mailit/Gemfile.lock
+++ b/mailit/Gemfile.lock
@@ -56,9 +56,13 @@ GEM
       mime-types (~> 1.16)
       treetop (~> 1.4.8)
     mime-types (1.17.2)
+    mini_portile2 (2.5.1)
     multi_json (1.0.4)
-    nokogiri (1.5.0)
+    nokogiri (1.11.5)
+      mini_portile2 (~> 2.5.0)
+      racc (~> 1.4)
     polyglot (0.3.3)
+    racc (1.5.2)
     rack (1.3.6)
     rack-cache (1.1)
       rack (>= 0.4)