diff --git a/Gemfile.lock b/Gemfile.lock
index 238cd43..a61c546 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -134,6 +134,8 @@ GEM
     jekyll-optional-front-matter (0.3.2)
       jekyll (>= 3.0, < 5.0)
     jekyll-paginate (1.1.0)
+    jekyll-pdf-embed (1.1.3)
+      jekyll
     jekyll-readme-index (0.3.0)
       jekyll (>= 3.0, < 5.0)
     jekyll-redirect-from (0.16.0)
@@ -215,9 +217,11 @@ GEM
       jekyll-seo-tag (~> 2.1)
     minitest (5.14.4)
     multipart-post (2.1.1)
-    nokogiri (1.11.3-arm64-darwin)
+    nokogiri (1.19.3-arm64-darwin)
       racc (~> 1.4)
-    nokogiri (1.11.3-x86_64-darwin)
+    nokogiri (1.19.3-x86_64-darwin)
+      racc (~> 1.4)
+    nokogiri (1.19.3-x86_64-linux-gnu)
       racc (~> 1.4)
     octokit (4.21.0)
       faraday (>= 0.9)
@@ -225,7 +229,7 @@ GEM
     pathutil (0.16.2)
       forwardable-extended (~> 2.6)
     public_suffix (4.0.6)
-    racc (1.5.2)
+    racc (1.8.1)
     rb-fsevent (0.11.0)
     rb-inotify (0.10.1)
       ffi (~> 1.0)
@@ -261,10 +265,12 @@ GEM
 
 PLATFORMS
   universal-darwin-20
+  x86_64-linux
 
 DEPENDENCIES
   github-pages
   jekyll-paginate
+  jekyll-pdf-embed
   jekyll-seo-tag
   jekyll-sitemap