diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 66c1e4d..144187c 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -1,5 +1,5 @@
 name: CI
-on: [push, pull_request]
+on: [push, workflow_dispatch]
 jobs:
   test:
     name: Test with Node.js v${{ matrix.node }} and ${{ matrix.os }}
diff --git a/changelog.md b/changelog.md
index fbe6b5b..3ef778f 100644
--- a/changelog.md
+++ b/changelog.md
@@ -67,6 +67,8 @@
 - Check TypeScript types via a new package `types` script.
 - Removed the [`jsdoc-md`](https://npm.im/jsdoc-md) dev dependency and the related package scripts, replacing the readme “API” section with a manually written “Exports” section.
 - Updated GitHub Actions CI config:
+  - The workflow no longer triggers on pull request, but still does on push.
+  - The workflow can now be manually triggered.
   - Run tests with Node.js v18, v20, v21.
   - Updated `actions/checkout` to v4.
   - Updated `actions/setup-node` to v3.