diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..f258f11
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,35 @@
+name: CI
+
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+    branches:
+      - master
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        ruby-version: [ '3.0', '3.1', '3.2', '3.3', 'jruby-9.2' ]
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v3
+
+      - name: Set up Ruby
+        uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: ${{ matrix.ruby-version }}
+          bundler-cache: true
+
+      - name: Update Bundler
+        run: gem install bundler
+
+      - name: Install dependencies
+        run: bundle install
+
+      - name: Run tests
+        run: bundle exec rspec
diff --git a/.tool-versions b/.tool-versions
new file mode 100644
index 0000000..1dd1998
--- /dev/null
+++ b/.tool-versions
@@ -0,0 +1 @@
+ruby 3.3.5
diff --git a/.travis.yml b/.travis.yml
deleted file mode 100644
index 5a069d4..0000000
--- a/.travis.yml
+++ /dev/null
@@ -1,18 +0,0 @@
-language: ruby
-cache: bundler
-
-rvm:
-  - 2.0
-  - 2.1
-  - 2.2
-  - 2.3
-  - 2.4
-  - 2.5
-  - 2.6
-  - 2.7
-  - jruby-9.2.8.0
-
-notifications:
-  disabled: false
-  recipients:
-    - xijo@pm.me
diff --git a/spec/lib/reverse_markdown_spec.rb b/spec/lib/reverse_markdown_spec.rb
index ef5b416..04faeb2 100644
--- a/spec/lib/reverse_markdown_spec.rb
+++ b/spec/lib/reverse_markdown_spec.rb
@@ -36,7 +36,8 @@
 
     describe 'force_encoding option', jruby: :exclude do
       it 'raises invalid byte sequence in UTF-8 exception' do
-        expect { ReverseMarkdown.convert("hi \255") }.to raise_error(Encoding::CompatibilityError)
+        # Older versions of ruby used to raise ArgumentError here. Remove when we drop support for 3.1.
+        expect { ReverseMarkdown.convert("hi \255") }.to raise_error { [Encoding::CompatibilityError, ArgumentError].include?(_1.class) }
       end
 
       it 'handles invalid byte sequence if option is set' do