diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 32255be..bc96894 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -20,7 +20,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ruby: [2.6, 2.7, '3.0', 3.1, 3.2, ruby-head, jruby]
+        ruby: ['3.0', 3.1, 3.2, ruby-head, jruby]
         gemfile:
           - Gemfile
           - Gemfile-pure
@@ -37,6 +37,6 @@ jobs:
         run: ruby --version; bundle exec rspec spec || $ALLOW_FAILURES
       - name: Coveralls GitHub Action
         uses: coverallsapp/github-action@v2
-        if: ${{ matrix.ruby == '3.0' && matrix.gemfile == 'Gemfile' }}
+        if: ${{ matrix.ruby == '3.2' && matrix.gemfile == 'Gemfile' }}
         with:
           github-token: ${{ secrets.GITHUB_TOKEN }}
diff --git a/Gemfile b/Gemfile
index 0b0874b..73cfcc1 100644
--- a/Gemfile
+++ b/Gemfile
@@ -5,7 +5,7 @@ gemspec
 gem "rdf",            github: "ruby-rdf/rdf",      branch: "develop"
 gem "rdf-spec",       github: "ruby-rdf/rdf-spec", branch: "develop"
 gem "rdf-xsd",        github: "ruby-rdf/rdf-xsd",  branch: "develop"
-gem "nokogiri",       '~> 1.13', '>= 1.13.4', platforms: [:mri, :jruby] # Ruby 2.6
+gem "nokogiri",       '~> 1.15', '>= 1.13.4', platforms: [:mri, :jruby]
 gem 'equivalent-xml', '~> 0.6'
 
 group :development, :test do
@@ -24,7 +24,7 @@ group :development, :test do
 end
 
 group :test do
-  gem 'simplecov', '~> 0.21',  platforms: :mri
+  gem 'simplecov', '~> 0.22',  platforms: :mri
   gem 'simplecov-lcov', '~> 0.8',  platforms: :mri
 end
 
diff --git a/README.md b/README.md
index 172f43d..50f317b 100755
--- a/README.md
+++ b/README.md
@@ -397,11 +397,11 @@ The template hash defines four Haml templates:
     }
 
 ## Dependencies
-* [Ruby](https://ruby-lang.org/) (>= 2.6)
-* [RDF.rb](https://rubygems.org/gems/rdf) (~> 3.2)
-* [Haml](https://rubygems.org/gems/haml) (>- 5.2, < 7)
+* [Ruby](https://ruby-lang.org/) (>= 3.0)
+* [RDF.rb](https://rubygems.org/gems/rdf) (~> 3.3)
+* [Haml](https://rubygems.org/gems/haml) (>- 6.1)
 * [HTMLEntities](https://rubygems.org/gems/htmlentities) (~> 4.3)
-* Soft dependency on [Nokogiri](https://rubygems.org/gems/nokogiri) (~> 1.12)
+* Soft dependency on [Nokogiri](https://rubygems.org/gems/nokogiri) (~> 1.15)
 
 ## Documentation
 Full documentation available on [Rubydoc.info][RDFa doc]
diff --git a/VERSION b/VERSION
index b347b11..15a2799 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-3.2.3
+3.3.0
diff --git a/rdf-rdfa.gemspec b/rdf-rdfa.gemspec
index 7d42129..68e365c 100755
--- a/rdf-rdfa.gemspec
+++ b/rdf-rdfa.gemspec
@@ -25,18 +25,18 @@ Gem::Specification.new do |gem|
   gem.files                 = %w(AUTHORS README.md UNLICENSE VERSION) + Dir.glob('lib/**/*.rb')
   gem.require_paths         = %w(lib)
 
-  gem.required_ruby_version = '>= 2.6'
+  gem.required_ruby_version = '>= 3.0'
   gem.requirements          = []
 
-  gem.add_runtime_dependency     'rdf',                 '~> 3.2'
+  gem.add_runtime_dependency     'rdf',                 '~> 3.3'
   gem.add_runtime_dependency     'rdf-vocab',           '~> 3.2'
-  gem.add_runtime_dependency     'haml',                '>= 5.2', "< 7"
+  gem.add_runtime_dependency     'haml',                '~> 6.1'
   gem.add_runtime_dependency     'rdf-xsd',             '~> 3.2'
-  gem.add_runtime_dependency     'rdf-aggregate-repo',  '~> 3.2'
+  gem.add_runtime_dependency     'rdf-aggregate-repo',  '~> 3.3'
   gem.add_runtime_dependency     'htmlentities',        '~> 4.3'
 
-  gem.add_development_dependency 'json-ld',             '~> 3.2'
-  gem.add_development_dependency 'rspec',               '~> 3.10'
+  gem.add_development_dependency 'json-ld',             '~> 3.3'
+  gem.add_development_dependency 'rspec',               '~> 3.12'
   gem.add_development_dependency 'rspec-its',           '~> 1.3'
   gem.add_development_dependency 'rdf-spec',            '~> 3.2'
   gem.add_development_dependency 'rdf-turtle',          '~> 3.2'