diff --git a/__tests__/infrastructure/ci-change.test.js b/__tests__/infrastructure/ci-change.test.js
new file mode 100644
index 0000000..1ad4457
--- /dev/null
+++ b/__tests__/infrastructure/ci-change.test.js
@@ -0,0 +1,61 @@
+const rule = require('../../src/rules/ci/ci-change');
+
+describe('CI Change Rule', () => {
+  it('labels for GitHub Actions workflow', () => {
+    const files = [{ filename: '.github/workflows/build.yml' }];
+    const labels = rule({ files, pr: {}, enableDebug: false });
+    expect(labels).toContain('ci-change');
+  });
+
+  it('labels for CircleCI config', () => {
+    const files = [{ filename: '.circleci/config.yml' }];
+    const labels = rule({ files, pr: {}, enableDebug: false });
+    expect(labels).toContain('ci-change');
+  });
+
+  it('labels for Jenkinsfile', () => {
+    const files = [{ filename: 'ci/Jenkinsfile' }];
+    const labels = rule({ files, pr: {}, enableDebug: false });
+    expect(labels).toContain('ci-change');
+  });
+
+  it('labels for Azure Pipelines', () => {
+    const files = [{ filename: 'azure-pipelines.yml' }];
+    const labels = rule({ files, pr: {}, enableDebug: false });
+    expect(labels).toContain('ci-change');
+  });
+
+  it('labels for GitLab CI', () => {
+    const files = [{ filename: 'root/gitlab-ci.yml' }];
+    const labels = rule({ files, pr: {}, enableDebug: false });
+    expect(labels).toContain('ci-change');
+  });
+
+  it('labels for Bitrise', () => {
+    const files = [{ filename: 'config/bitrise.yml' }];
+    const labels = rule({ files, pr: {}, enableDebug: false });
+    expect(labels).toContain('ci-change');
+  });
+
+  it('does not label for non-ci files', () => {
+    const files = [{ filename: 'src/index.ts' }];
+    const labels = rule({ files, pr: {}, enableDebug: false });
+    expect(labels).toEqual([]);
+  });
+
+  it('handles empty files array', () => {
+    const labels = rule({ files: [], pr: {}, enableDebug: false });
+    expect(labels).toEqual([]);
+  });
+
+  it('handles null filename', () => {
+    const files = [{ filename: null }];
+    const labels = rule({ files, pr: {}, enableDebug: false });
+    expect(labels).toEqual([]);
+  });
+
+  it('handles debug mode', () => {
+    const files = [{ filename: '.github/workflows/test.yml' }];
+    expect(() => rule({ files, pr: {}, enableDebug: true })).not.toThrow();
+  });
+});
diff --git a/src/rules/ci/ci-change.js b/src/rules/ci/ci-change.js
new file mode 100644
index 0000000..95d4e13
--- /dev/null
+++ b/src/rules/ci/ci-change.js
@@ -0,0 +1,46 @@
+/**
+ * CI Workflow Change Rule
+ *
+ * Adds `ci-change` if CI pipeline/workflow files are modified.
+ */
+
+module.exports = function ciChangeRule({ files, pr, enableDebug }) {
+  const labels = [];
+
+  const patterns = [
+    /^\.github\/workflows\//i,
+    /^\.circleci\//i,
+    /(^|\/)Jenkinsfile$/i,
+    /(^|\/)azure-pipelines\.ya?ml$/i,
+    /(^|\/)gitlab-ci\.ya?ml$/i,
+    /(^|\/)bitrise\.ya?ml$/i
+  ];
+
+  const detected = (files || []).some(f => {
+    const name = (f && f.filename ? String(f.filename) : '').toLowerCase();
+    return name && patterns.some(rx => rx.test(name));
+  });
+
+  if (detected) {
+    labels.push('ci-change');
+  }
+
+  if (enableDebug) {
+    console.log(`[CI Change Rule] → ${labels.join(', ') || 'none'}`);
+  }
+
+  return labels;
+};
+
+module.exports.metadata = {
+  name: 'CI Workflow Changes',
+  description: 'Detects modifications to CI workflows/pipelines',
+  labels: [
+    { name: 'ci-change', color: '0075CA', description: 'CI workflow changed' }
+  ],
+  author: 'pr-auto-labeler',
+  version: '1.0.0',
+  category: 'infrastructure'
+};
+
+