diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index cbb9114..7eb055f 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -20,19 +20,13 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ruby:
-          - 2.6
-          - 2.7
-          - "3.0"
-          - 3.1
-          - ruby-head
-          - jruby
+        ruby: [2.6, 2.7, '3.0', 3.1, 3.2, ruby-head, jruby]
         gemfile:
           - Gemfile
           - Gemfile-pure
     steps:
       - name: Clone repository
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
       - name: Set up Ruby
         uses: ruby/setup-ruby@v1
         with:
diff --git a/.github/workflows/generate-docs.yml b/.github/workflows/generate-docs.yml
index b8d16ed..65aea93 100644
--- a/.github/workflows/generate-docs.yml
+++ b/.github/workflows/generate-docs.yml
@@ -10,7 +10,7 @@ jobs:
     name: Update gh-pages with docs
     steps:
       - name: Clone repository
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
       - name: Set up Ruby
         uses: ruby/setup-ruby@v1
         with:
diff --git a/Gemfile b/Gemfile
index 0106453..0c72d41 100644
--- a/Gemfile
+++ b/Gemfile
@@ -4,7 +4,7 @@ gemspec
 
 gem 'rdf',            github: "ruby-rdf/rdf",       branch: "develop"
 gem 'rdf-rdfa',       github: "ruby-rdf/rdf-rdfa",  branch: "develop"
-gem "nokogiri",       '~> 1.12', platforms: [:mri, :jruby]
+gem "nokogiri",       '~> 1.13', '>= 1.13.4', platforms: [:mri, :jruby]
 
 group :development do
   gem 'ebnf',               github: "dryruby/ebnf",                 branch: "develop"