diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 3327ef50..5b922351 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -258,3 +258,45 @@ jobs:
         php build/moodle-plugin-ci.phar phpunit --verbose --coverage-text --fail-on-warning
         php build/moodle-plugin-ci.phar behat --profile default
         php build/moodle-plugin-ci.phar behat --profile chrome
+
+  selfupdatetest:
+    name: SelfUpdate tests (PHAR)
+    runs-on: ubuntu-22.04
+    env:
+      lowest_release: '4.1.8'
+
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          # Each supported PHP version once. That's enough.
+          - php: '8.2'
+          - php: '8.1'
+          - php: '8.0'
+          - php: '7.4'
+
+    steps:
+    - name: Setup PHP ${{ matrix.php }}
+      uses: shivammathur/setup-php@v2
+      with:
+        php-version: ${{ matrix.php }}
+        extensions: pgsql, zip, gd, xmlrpc, soap
+        ini-values: max_input_vars=5000
+        coverage: none
+
+    - name: Download base ${{ env.lowest_release }} PHAR artifact
+      uses: robinraju/release-downloader@v1.8
+      with:
+        repository: moodlehq/moodle-plugin-ci
+        tag: ${{ env.lowest_release }}
+        fileName: moodle-plugin-ci.phar
+
+    - name: Self update PHAR to actual
+      run: |
+        php moodle-plugin-ci.phar selfupdate
+        php moodle-plugin-ci.phar --version | grep -qv "${{ env.lowest_release }}"
+
+    - name: Rollback PHAR to base ${{ env.lowest_release }}
+      run: |
+        php moodle-plugin-ci.phar selfupdate --rollback
+        php moodle-plugin-ci.phar --version | grep -q "${{ env.lowest_release }}"