diff --git a/Gemfile b/Gemfile
index 9751a55e..7f240224 100644
--- a/Gemfile
+++ b/Gemfile
@@ -10,7 +10,7 @@ gem 'jekyll-redirect-from'
 gem 'jekyll-sitemap'
 gem 'htmlbeautifier'
 gem 'kramdown-math-katex'
-gem 'nokogiri', '~> 1.18'
+gem 'nokogiri', '~> 1.19'
 
 # The plugin in the gem repository is ccurrently not maintained.
 # Temporarity provided locally.
diff --git a/Gemfile.lock b/Gemfile.lock
index 22b7b348..90d91c13 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -108,12 +108,12 @@ GEM
     mercenary (0.4.0)
     metrics (0.15.0)
     mini_portile2 (2.8.9)
-    nokogiri (1.18.10)
+    nokogiri (1.19.3)
       mini_portile2 (~> 2.8.2)
       racc (~> 1.4)
-    nokogiri (1.18.10-arm64-darwin)
+    nokogiri (1.19.3-arm64-darwin)
       racc (~> 1.4)
-    nokogiri (1.18.10-x86_64-linux-gnu)
+    nokogiri (1.19.3-x86_64-linux-gnu)
       racc (~> 1.4)
     pathutil (0.16.2)
       forwardable-extended (~> 2.6)
@@ -169,7 +169,7 @@ DEPENDENCIES
   jekyll-redirect-from
   jekyll-sitemap
   kramdown-math-katex
-  nokogiri (~> 1.18)
+  nokogiri (~> 1.19)
   webrick (>= 1.8.2)
 
 BUNDLED WITH