diff --git a/create_jenkins_job.py b/create_jenkins_job.py
index 10d811a7..67b93d16 100755
--- a/create_jenkins_job.py
+++ b/create_jenkins_job.py
@@ -191,7 +191,6 @@ def create_job(os_name, job_name, template_file, additional_dict):
         # configure manual triggered job
         create_job(os_name, 'ci_' + os_name, 'ci_job.xml.em', {
             'cmake_build_type': 'None',
-            'test_args_default': os_configs.get(os_name, {}).get('test_args_default', data['test_args_default']) + ' --executor sequential',
         })
         # configure test jobs for experimenting with job config changes
         # Keep parameters the same as the manual triggered job above.
@@ -295,7 +294,7 @@ def create_job(os_name, job_name, template_file, additional_dict):
                 'cmake_build_type': 'None',
                 'compile_with_clang_default': 'true',
                 'build_args_default': clang_libcxx_build_args,
-                'test_args_default': clang_libcxx_test_args + ' --executor sequential',
+                'test_args_default': clang_libcxx_test_args,
             })
 
         # configure nightly job for testing rmw/rcl based packages with thread sanitizer on linux
@@ -431,7 +430,7 @@ def create_job(os_name, job_name, template_file, additional_dict):
                 'build_args_default': data['build_args_default'] + ' --packages-skip qt_gui_cpp --packages-skip-by-dep qt_gui_cpp ' +
                                       '--packages-up-to ' + ' '.join(quality_level_pkgs + testing_pkgs_for_quality_level),
                 'test_args_default': data['test_args_default'] + ' --packages-skip qt_gui_cpp --packages-skip-by-dep qt_gui_cpp ' +
-                                     '--packages-up-to ' + ' '.join(quality_level_pkgs + testing_pkgs_for_quality_level) + ' --executor sequential',
+                                     '--packages-up-to ' + ' '.join(quality_level_pkgs + testing_pkgs_for_quality_level),
             })
             create_job(os_name, 'test_' + os_name + '_coverage', 'ci_job.xml.em', {
                 'cmake_build_type': 'Debug',
@@ -548,7 +547,6 @@ def create_job(os_name, job_name, template_file, additional_dict):
             job_data['label_expression'] = 'built-in || master'
             job_data['os_specific_data'] = os_specific_data
             job_data['cmake_build_type'] = 'None'
-            job_data['test_args_default'] += ' --executor sequential'
             job_data.update(retention_data_by_job_type(launcher_job_name))
             job_config = expand_template('ci_launcher_job.xml.em', job_data)
             configure_job(jenkins, launcher_job_name, job_config, **jenkins_kwargs)
diff --git a/ros2_batch_job/__main__.py b/ros2_batch_job/__main__.py
index 832b8941..fa93f772 100644
--- a/ros2_batch_job/__main__.py
+++ b/ros2_batch_job/__main__.py
@@ -359,7 +359,11 @@ def build_and_test(args, job, colcon_script):
         test_cmd.append('--pytest-with-coverage')
     test_cmd.extend(args.test_args)
 
-    ret_test = job.run(test_cmd, exit_on_error=False, shell=True)
+    test_env = dict(os.environ)
+    if args.ros_distro in ('humble', 'iron'):
+        test_env['COLCON_DEFAULT_EXECUTOR'] = 'sequential'
+
+    ret_test = job.run(test_cmd, exit_on_error=False, shell=True, env=test_env)
     info("colcon test returned: '{0}'".format(ret_test))
     print('# END SUBSECTION')
     if ret_test: