diff --git a/.github/workflows/check.yml b/.github/workflows/check.yml
index 83ec105..f95aacf 100644
--- a/.github/workflows/check.yml
+++ b/.github/workflows/check.yml
@@ -57,7 +57,7 @@ jobs:
         GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
         DCOR_API_KEY: ${{ secrets.DCOR_API_KEY }}
       run: |
-        coverage run --source=dcoraid -m pytest tests
+        coverage run --source=dcoraid -m pytest --durations=20 tests
     - name: Lint with flake8
       run: |
         flake8 --exclude _version.py .
diff --git a/CHANGELOG b/CHANGELOG
index d67a4d9..fff1c0e 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -66,6 +66,8 @@
  - tests: replace tests that required access to the `figshare-import`
    circle with a circle, collection, and dataset shared by a second
    automatically created test user
+ - tests: clear persistent upload jobs before and after each GUI test,
+   so that new main windows do not upload jobs of previous tests again
 1.1.3
  - enh: use `HTTPAdapter` with `urlib3`'s `Retry` to handle connection issues
  - enh: use `requests.Session` when caching is disabled
diff --git a/tests/test_gui.py b/tests/test_gui.py
index 36db55f..560a24b 100644
--- a/tests/test_gui.py
+++ b/tests/test_gui.py
@@ -16,6 +16,7 @@
 from PyQt6.QtWidgets import QInputDialog, QMessageBox
 
 from . import common
+from .conftest import cleanup_dcoraid_tasks
 
 
 @pytest.fixture(scope="function", autouse=True)
@@ -23,6 +24,18 @@ def clear_ckan_api():
     dcoraid.gui.api._CKAN_API = None
 
 
+@pytest.fixture(scope="function", autouse=True)
+def clear_persistent_upload_jobs():
+    """Start and end every GUI test with an empty persistent job list
+
+    Otherwise, each new main window restores (and uploads again) the
+    unfinished upload jobs of all previous tests.
+    """
+    cleanup_dcoraid_tasks()
+    yield
+    cleanup_dcoraid_tasks()
+
+
 @pytest.fixture
 def mw(qtbot):
     # Always set server correctly, because there is a test that