diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..d99e929
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,55 @@
+name: CI
+
+on:
+  pull_request:
+  push:
+    branches: [master]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v6
+
+      - name: Build image
+        run: docker compose build --pull
+
+      - name: Lint (RuboCop)
+        run: docker compose run --rm api_client_builder bundle exec rubocop
+
+      # Named container (not --rm) so coverage can be copied out afterwards.
+      # SimpleCov enforces its 97% minimum in-container and fails the build below.
+      - name: Spec
+        run: docker compose run --name acb_spec api_client_builder bundle exec rspec --format doc
+
+      - name: Export coverage report
+        if: always()
+        continue-on-error: true
+        run: docker cp acb_spec:/usr/src/app/coverage ./coverage
+
+      - name: Upload coverage artifact
+        if: always()
+        uses: actions/upload-artifact@v4
+        with:
+          name: coverage-report
+          path: coverage/
+          if-no-files-found: ignore
+
+  # DISABLED — brought over from the Jenkins pipeline but will not run yet.
+  # To enable auto-publishing to RubyGems on merge to master:
+  #   1. Add a `RUBYGEMS_API_KEY` repository secret (the RubyGems "rubygems-rw" API key).
+  #   2. Replace the `if: false` below with:  if: github.ref == 'refs/heads/master'
+  publish:
+    needs: test
+    runs-on: ubuntu-latest
+    if: false
+    steps:
+      - uses: actions/checkout@v6
+
+      - name: Build image
+        run: docker compose build --pull
+
+      - name: Publish gem to RubyGems
+        env:
+          GEM_HOST_API_KEY: ${{ secrets.RUBYGEMS_API_KEY }}
+        run: docker compose run -e GEM_HOST_API_KEY --rm api_client_builder /bin/bash -lc "./bin/publish.sh"
diff --git a/.rubocop.yml b/.rubocop.yml
index 8fa6435..e911d65 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -1,5 +1,5 @@
 AllCops:
-  TargetRubyVersion: 3.4
+  TargetRubyVersion: 3.0
 
 Metrics/BlockLength:
   Exclude:
diff --git a/.travis.yml b/.travis.yml
deleted file mode 100644
index 37422cc..0000000
--- a/.travis.yml
+++ /dev/null
@@ -1,20 +0,0 @@
-dist: trusty
-sudo: false
-language: ruby
-cache: bundler
-
-rvm:
-  - 2.3
-  - 2.4
-  - 2.5
-
-matrix:
-  fast_finish: true
-
-before_install: gem update bundler
-bundler_args: --jobs 3
-install: bundle install --jobs 3
-
-script:
-  - bundle exec rubocop --fail-level autocorrect
-  - bundle exec rspec
diff --git a/Jenkinsfile b/Jenkinsfile
deleted file mode 100755
index cb9c124..0000000
--- a/Jenkinsfile
+++ /dev/null
@@ -1,61 +0,0 @@
-pipeline {
-  agent {
-    label 'docker'
-  }
-
-  options {
-    parallelsAlwaysFailFast()
-  }
-
-  stages {
-    stage('Build') {
-      steps {
-        sh 'docker compose build --pull'
-      }
-    }
-
-    stage('Spec') {
-      steps {
-        sh 'docker compose run api_client_builder bundle exec rspec --format doc'
-        sh '''
-        image=$(docker ps --all --no-trunc | grep spec | cut -f 1 -d " " | head -n 1)
-        docker cp "$image:/usr/src/app/coverage" .
-        '''
-        sh 'ls -als coverage'
-      }
-
-      post {
-        always {
-          publishHTML target: [
-              allowMissing: false,
-              alwaysLinkToLastBuild: false,
-              keepAll: true,
-              reportDir: 'coverage',
-              reportFiles: 'index.html',
-              reportName: 'Coverage Report'
-            ]
-        }
-      }
-    }
-
-    stage('Publish') {
-      when {
-        allOf {
-          expression { GERRIT_BRANCH == 'master' }
-          environment name: 'GERRIT_EVENT_TYPE', value: 'change-merged'
-        }
-      }
-      steps {
-        withCredentials([string(credentialsId: 'rubygems-rw', variable: 'GEM_HOST_API_KEY')]) {
-          sh 'docker compose run -e GEM_HOST_API_KEY --rm api_client_builder /bin/bash -lc "./bin/publish.sh"'
-        }
-      }
-    }
-  }
-
-  post {
-    cleanup {
-      sh 'docker compose down --rmi=all --volumes --remove-orphans'
-    }
-  }
-}