diff --git a/Gemfile.lock b/Gemfile.lock
index a8f00f3..24e06e6 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -53,6 +53,8 @@ GEM
       sass-embedded (~> 1.54)
     jekyll-seo-tag (2.8.0)
       jekyll (>= 3.8, < 5.0)
+    jekyll-sitemap (1.4.0)
+      jekyll (>= 3.7, < 5.0)
     jekyll-watch (2.2.1)
       listen (~> 3.0)
     just-the-docs (0.8.2)
@@ -110,6 +112,8 @@ DEPENDENCIES
   http_parser.rb (~> 0.6.0)
   jekyll (~> 4.3.3)
   jekyll-feed (~> 0.12)
+  jekyll-seo-tag
+  jekyll-sitemap
   just-the-docs
   minima (~> 2.5)
   rouge!