diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..e11165a
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,30 @@
+# frozen_string_literal: true
+
+name: CI
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        ruby-version: ["3.0", "3.1", "3.2", "3.3"]
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up Ruby ${{ matrix.ruby-version }}
+        uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: ${{ matrix.ruby-version }}
+
+      - name: Run tests
+        run: ruby -Ilib -Itest -e "Dir['test/test_*.rb'].each { |f| require_relative f }"
+
+      - name: Verify gem builds
+        run: gem build ipdata.gemspec
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
new file mode 100644
index 0000000..8318d1f
--- /dev/null
+++ b/.github/workflows/release.yml
@@ -0,0 +1,84 @@
+name: Publish to RubyGems
+
+on:
+  push:
+    tags:
+      - "v*"
+  workflow_dispatch:
+    inputs:
+      bump:
+        description: "Version bump type"
+        required: true
+        type: choice
+        options:
+          - patch
+          - minor
+          - major
+
+jobs:
+  bump:
+    if: github.event_name == 'workflow_dispatch'
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up Ruby
+        uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: "3.3"
+
+      - name: Bump version
+        id: bump
+        run: |
+          current=$(ruby -r ./lib/ipdata/version -e "puts IPData::VERSION")
+          IFS='.' read -r major minor patch <<< "$current"
+
+          case "${{ inputs.bump }}" in
+            major) major=$((major + 1)); minor=0; patch=0 ;;
+            minor) minor=$((minor + 1)); patch=0 ;;
+            patch) patch=$((patch + 1)) ;;
+          esac
+
+          new_version="${major}.${minor}.${patch}"
+          echo "version=${new_version}" >> "$GITHUB_OUTPUT"
+
+          sed -i "s/VERSION = \"${current}\"/VERSION = \"${new_version}\"/" lib/ipdata/version.rb
+
+      - name: Commit and tag
+        run: |
+          git config user.name "github-actions[bot]"
+          git config user.email "github-actions[bot]@users.noreply.github.com"
+          git add lib/ipdata/version.rb
+          git commit -m "Bump version to v${{ steps.bump.outputs.version }}"
+          git tag "v${{ steps.bump.outputs.version }}"
+          git push origin main --tags
+
+  release:
+    if: always() && (github.event_name == 'push' || needs.bump.result == 'success')
+    needs: [bump]
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      id-token: write
+
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          ref: ${{ github.event_name == 'workflow_dispatch' && 'main' || github.ref }}
+
+      - name: Set up Ruby
+        uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: "3.3"
+
+      - name: Run tests
+        run: ruby -Ilib -Itest -e "Dir['test/test_*.rb'].each { |f| require_relative f }"
+
+      - name: Build gem
+        run: gem build ipdata.gemspec
+
+      - name: Push to RubyGems
+        uses: rubygems/release-gem@v1