diff --git a/.github/workflows/tests.yaml b/.github/workflows/tests.yaml
index eb72fd8..7091237 100644
--- a/.github/workflows/tests.yaml
+++ b/.github/workflows/tests.yaml
@@ -81,7 +81,7 @@ jobs:
         run: pip install tox
 
       - name: Run tox
-        run: tox -e py${{ matrix.python-version }}
+        run: tox -e py${{ matrix.python-version }} -- --runslow
         env:
           PYTHONUNBUFFERED: "True"
 
diff --git a/tests/conftest.py b/tests/conftest.py
new file mode 100644
index 0000000..e446d0a
--- /dev/null
+++ b/tests/conftest.py
@@ -0,0 +1,21 @@
+import pytest
+
+
+def pytest_addoption(parser):
+    parser.addoption(
+        "--runslow", action="store_true", default=False, help="run slow tests"
+    )
+
+
+def pytest_configure(config):
+    config.addinivalue_line("markers", "slow: mark test as slow to run")
+
+
+def pytest_collection_modifyitems(config, items):
+    if config.getoption("--runslow"):
+        # --runslow given in cli: do not skip slow tests
+        return
+    skip_slow = pytest.mark.skip(reason="need --runslow option to run")
+    for item in items:
+        if "slow" in item.keywords:
+            item.add_marker(skip_slow)
diff --git a/tests/test_mapper_resubmit.py b/tests/test_mapper_resubmit.py
index 07e1fdb..9af20af 100644
--- a/tests/test_mapper_resubmit.py
+++ b/tests/test_mapper_resubmit.py
@@ -1,4 +1,7 @@
 import os
+
+import pytest
+
 from galaxy_test.driver.integration_util import IntegrationTestCase
 from galaxy.webapps.base import webapp
 
@@ -31,9 +34,10 @@ def _assert_job_fails(self, tool_id="exit_code_oom", resource_parameters=None):
 
         assert exception_thrown
 
-    # FIXME: Temporarily disable tests till https://github.com/galaxyproject/galaxy/issues/14021 is resolved.
+    @pytest.mark.slow
     def test_mapping_with_resubmission(self):
         self._assert_job_passes(tool_id="exit_code_oom_with_resubmit")
 
+    @pytest.mark.slow
     def test_mapping_without_resubmission(self):
         self._assert_job_fails(tool_id="exit_code_oom_no_resubmit")