diff --git a/Gemfile.lock b/Gemfile.lock
index ab8330f..34b7d09 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -262,7 +262,7 @@ GEM
     thread_safe (0.3.6)
     typhoeus (1.3.1)
       ethon (>= 0.9.0)
-    tzinfo (1.2.5)
+    tzinfo (1.2.10)
       thread_safe (~> 0.1)
     unicode-display_width (1.6.0)
     w3c_validators (1.3.4)
@@ -276,6 +276,7 @@ PLATFORMS
 DEPENDENCIES
   github-pages
   html-proofer (~> 3.0)
+  jekyll-feed
   jekyll-theme-cayman!
   rubocop (~> 0.50)
   w3c_validators (~> 1.3)