diff --git a/Gemfile.lock b/Gemfile.lock
index 83a3f25..86d1098 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -225,7 +225,9 @@ GEM
       jekyll-seo-tag (~> 2.1)
     minitest (5.14.4)
     multipart-post (2.1.1)
-    nokogiri (1.12.5-x86_64-darwin)
+    nokogiri (1.13.9-x86_64-darwin)
+      racc (~> 1.4)
+    nokogiri (1.13.9-x86_64-linux)
       racc (~> 1.4)
     octokit (4.21.0)
       faraday (>= 0.9)
@@ -270,6 +272,7 @@ GEM
 
 PLATFORMS
   x86_64-darwin-18
+  x86_64-linux
 
 DEPENDENCIES
   github-pages (~> 219)