diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 4d1aa07c..d638beff 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -16,7 +16,7 @@ jobs:
     - name: Set up Ruby
       uses: ruby/setup-ruby@v1
       with:
-        ruby-version: 2.7
+        ruby-version: 3.2
     - name: Install dependencies
       run: bundle install
 
diff --git a/Gemfile b/Gemfile
index 7b923321..d390680f 100644
--- a/Gemfile
+++ b/Gemfile
@@ -2,7 +2,6 @@ source "https://rubygems.org"
 
 gem 'json-ld', github: 'ruby-rdf/json-ld', branch: 'develop'
 gem 'nokogiri'
-gem 'nokogumbo'
 gem 'linkeddata'
 gem 'colorize'
 gem 'rake'
diff --git a/Gemfile.lock b/Gemfile.lock
index 98f6cba2..3804079a 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -87,8 +87,6 @@ GEM
       racc (~> 1.4)
     nokogiri (1.14.3-x86_64-linux)
       racc (~> 1.4)
-    nokogumbo (2.0.5)
-      nokogiri (~> 1.8, >= 1.8.4)
     public_suffix (4.0.6)
     racc (1.6.2)
     rack (2.2.6.4)
@@ -194,6 +192,7 @@ GEM
 
 PLATFORMS
   arm64-darwin-21
+  arm64-darwin-22
   x86_64-darwin-20
   x86_64-linux
 
@@ -203,9 +202,8 @@ DEPENDENCIES
   json-ld!
   linkeddata
   nokogiri
-  nokogumbo
   rake
   redcarpet
 
 BUNDLED WITH
-   2.3.8
+   2.5.6
diff --git a/Rakefile b/Rakefile
index 344e4697..1a5fda16 100644
--- a/Rakefile
+++ b/Rakefile
@@ -14,7 +14,7 @@ end
 
 desc "Check HTML"
 task :check_html do
-  require 'nokogumbo'
+  require 'nokogiri'
   doc = ::Nokogiri::HTML5(File.open("index.html"), max_parse_errors: 1000)
   unless doc.errors.empty?
     STDERR.puts "Errors found parsing index.html:"