diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 8ab178f3..347909bb 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -60,13 +60,10 @@ jobs:
     name: Linked unit tests
     needs: offline-tests
     strategy:
-      max-parallel: 2
       fail-fast: false
       matrix:
         platform: [ubuntu-latest, macos-latest]
-        python-version: ['3.10', ]
         include:
-          # use two different Dropbox accounts to run tests in parallel
           - platform: ubuntu-latest
             token: DROPBOX_REFRESH_TOKEN_1
 
@@ -86,10 +83,10 @@ jobs:
         uses: actions/checkout@v3
         if: github.event_name != 'pull_request_target'
 
-      - name: Set up Python ${{ matrix.python-version }}
+      - name: Set up Python 3.10
         uses: actions/setup-python@v3
         with:
-          python-version: ${{ matrix.python-version }}
+          python-version: '3.10'
 
       - name: Install dependencies
         run: |
@@ -129,19 +126,23 @@ jobs:
     name: Linked integration tests
     needs: linked-unit-tests
     strategy:
-      max-parallel: 2
       fail-fast: false
       matrix:
-        platform: [ubuntu-latest, macos-latest]
-        python-version: ['3.10', ]
+        observer: [inotify, fsevents, kqueue]
         include:
-          # use two different Dropbox accounts to run tests in parallel
-          - platform: ubuntu-latest
+          - observer: inotify
+            platform: ubuntu-latest
             token: DROPBOX_REFRESH_TOKEN_1
 
-          - platform: macos-latest
+          - observer: fsevents
+            platform: macos-latest
             token: DROPBOX_REFRESH_TOKEN_2
 
+          - observer: kqueue
+            platform: macos-latest
+            token: DROPBOX_REFRESH_TOKEN_3
+
+
     runs-on: ${{ matrix.platform }}
     steps:
       - name: Checkout merge commit
@@ -155,10 +156,10 @@ jobs:
         uses: actions/checkout@v3
         if: github.event_name != 'pull_request_target'
 
-      - name: Set up Python ${{ matrix.python-version }}
+      - name: Set up Python 3.10
         uses: actions/setup-python@v3
         with:
-          python-version: ${{ matrix.python-version }}
+          python-version: '3.10'
 
       - name: Install dependencies
         run: |
@@ -180,7 +181,7 @@ jobs:
 
       - name: Test with pytest
         run: |
-          pytest -x --verbose --cov=maestral --cov-report=xml tests/linked/integration
+          pytest -x --verbose --cov=maestral --cov-report=xml tests/linked/integration --fs-observer ${{ matrix.observer }}
 
       - name: Upload Code Coverage
         uses: codecov/codecov-action@v3
diff --git a/tests/linked/integration/conftest.py b/tests/linked/integration/conftest.py
index e690a55b..1553a0eb 100644
--- a/tests/linked/integration/conftest.py
+++ b/tests/linked/integration/conftest.py
@@ -4,6 +4,7 @@ import time
 
 import pytest
 
+import maestral.manager
 from maestral.main import Maestral
 from maestral.config import remove_configuration
 from maestral.utils.path import generate_cc_name, delete
@@ -20,13 +21,37 @@ fsevents_logger = logging.getLogger("fsevents")
 fsevents_logger.setLevel(logging.DEBUG)
 
 
+def pytest_addoption(parser):
+    parser.addoption("--fs-observer", action="store", default="auto", dest="OBSERVER")
+
+
 @pytest.fixture
-def m():
+def m(pytestconfig):
     """
     Returns a Maestral instance linked to a test account and syncing. Acquires a lock
     on the account for the duration of the test and removes all items from the server
     after completing the test.
     """
+
+    # Patch file event observer backend if requested.
+    if pytestconfig.option.OBSERVER == "inotify":
+        from watchdog.observers.inotify import InotifyObserver
+
+        maestral.manager.Observer = InotifyObserver
+    elif pytestconfig.option.OBSERVER == "fsevents":
+        from watchdog.observers.fsevents import FSEventsObserver
+
+        maestral.manager.Observer = FSEventsObserver
+    elif pytestconfig.option.OBSERVER == "kqueue":
+        from watchdog.observers.kqueue import KqueueObserver
+
+        maestral.manager.Observer = KqueueObserver
+    elif pytestconfig.option.OBSERVER == "polling":
+        from maestral.fsevents.polling import OrderedPollingObserver
+
+        maestral.manager.Observer = OrderedPollingObserver
+
+    # Initialize Maestral.
     config_name = "test-config"
 
     m = Maestral(config_name)