diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index bc96894..d2f481f 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -20,7 +20,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ruby: ['3.0', 3.1, 3.2, ruby-head, jruby]
+        ruby: ['3.0', 3.1, 3.2, 3.3, 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 == '3.2' && matrix.gemfile == 'Gemfile' }}
+        if: ${{ matrix.ruby == '3.3' && matrix.gemfile == 'Gemfile' }}
         with:
           github-token: ${{ secrets.GITHUB_TOKEN }}
diff --git a/README.md b/README.md
index 50f317b..4014ec3 100755
--- a/README.md
+++ b/README.md
@@ -428,6 +428,10 @@ Full documentation available on [Rubydoc.info][RDFa doc]
 * [XHTML+RDFa 1.1][XHTML+RDFa 1.1]
 * [RDFa-test-suite](https://rdfa.info/test-suite/              "RDFa test suite")
 
+## Change Log
+
+See [Release Notes on GitHub](https://github.com/ruby-rdf/rdf-rdfa/releases)
+
 ## Author
 * [Gregg Kellogg](https://github.com/gkellogg) - <https://greggkellogg.net/>
 
diff --git a/rdf-rdfa.gemspec b/rdf-rdfa.gemspec
index 6b8bfa8..1f8508a 100755
--- a/rdf-rdfa.gemspec
+++ b/rdf-rdfa.gemspec
@@ -35,6 +35,7 @@ Gem::Specification.new do |gem|
   gem.add_runtime_dependency     'rdf-aggregate-repo',  '~> 3.3'
   gem.add_runtime_dependency     'htmlentities',        '~> 4.3'
 
+  gem.add_development_dependency 'getoptlong',          '~> 0.2'
   gem.add_development_dependency 'json-ld',             '~> 3.3'
   gem.add_development_dependency 'rspec',               '~> 3.12'
   gem.add_development_dependency 'rspec-its',           '~> 1.3'