diff --git a/rnaseq_pipeline/tasks.py b/rnaseq_pipeline/tasks.py
index b6ab601a..27ec27de 100755
--- a/rnaseq_pipeline/tasks.py
+++ b/rnaseq_pipeline/tasks.py
@@ -22,7 +22,7 @@
 from .sources.local import DownloadLocalSample, DownloadLocalExperiment
 from .sources.sra import DownloadSraProject, DownloadSraExperiment, ExtractSraProjectBatchInfo
 from .targets import GemmaDatasetPlatform, GemmaDatasetHasBatch, RsemReference
-from .utils import no_retry, IlluminaFastqHeader, TaskWithPriorityMixin, RerunnableTaskMixin, remove_task_output
+from .utils import no_retry, IlluminaFastqHeader, RerunnableTaskMixin, remove_task_output
 from .gemma import GemmaTask
 
 logger = logging.getLogger('luigi-interface')
@@ -53,7 +53,7 @@ def requires(self):
         else:
             raise ValueError('Unknown source for sample: {}.'.format(self.source))
 
-class DownloadExperiment(TaskWithPriorityMixin, TaskWithOutputMixin, WrapperTask):
+class DownloadExperiment(TaskWithOutputMixin, WrapperTask):
     """
     This is a generic task that detects which kind of experiment is intended to
     be downloaded so that downstream tasks can process regardless of the data
@@ -134,7 +134,7 @@ def run(self):
         else:
             raise NotImplementedError('Trimming more than two mates is not supported.')
 
-class TrimExperiment(TaskWithPriorityMixin, DynamicTaskWithOutputMixin, DynamicWrapperTask):
+class TrimExperiment(DynamicTaskWithOutputMixin, DynamicWrapperTask):
     """
     Quality control all the samples in a given experiment.
     """
@@ -160,7 +160,7 @@ def run(self):
         os.makedirs(destdir, exist_ok=True)
         yield [fastqc.GenerateReport(fastq_in.path, destdir) for fastq_in in self.input()]
 
-class QualityControlExperiment(TaskWithPriorityMixin, DynamicTaskWithOutputMixin, DynamicWrapperTask):
+class QualityControlExperiment(DynamicTaskWithOutputMixin, DynamicWrapperTask):
     """
     Quality control all the samples in a given experiment.
     """
@@ -289,7 +289,7 @@ def program_args(self):
     def output(self):
         return luigi.LocalTarget(self._get_output_prefix() + f'.{self.scope}.results')
 
-class AlignExperiment(TaskWithPriorityMixin, DynamicTaskWithOutputMixin, DynamicWrapperTask):
+class AlignExperiment(DynamicTaskWithOutputMixin, DynamicWrapperTask):
     """
     Align all the samples in a given experiment.
 
@@ -317,7 +317,7 @@ def run(self):
 
 @no_retry
 @requires(TrimExperiment, QualityControlExperiment, AlignExperiment)
-class GenerateReportForExperiment(TaskWithPriorityMixin, RerunnableTaskMixin, luigi.Task):
+class GenerateReportForExperiment(RerunnableTaskMixin, luigi.Task):
     """
     Generate a summary report for an experiment with MultiQC.
 
@@ -336,7 +336,7 @@ def output(self):
         return luigi.LocalTarget(join(cfg.OUTPUT_DIR, 'report', self.reference_id, self.experiment_id, 'multiqc_report.html'))
 
 @requires(AlignExperiment)
-class CountExperiment(TaskWithPriorityMixin, luigi.Task):
+class CountExperiment(luigi.Task):
     """
     Combine the RSEM quantifications results from all the samples in a given
     experiment.
@@ -362,7 +362,7 @@ def output(self):
         return [luigi.LocalTarget(join(destdir, f'{self.experiment_id}_counts.{self.scope}')),
                 luigi.LocalTarget(join(destdir, f'{self.experiment_id}_fpkm.{self.scope}'))]
 
-class SubmitExperimentBatchInfoToGemma(TaskWithPriorityMixin, GemmaTask):
+class SubmitExperimentBatchInfoToGemma(GemmaTask):
     """
     Submit the batch information of an experiment to Gemma.
     """
@@ -388,7 +388,7 @@ def output(self):
         return GemmaDatasetHasBatch(self.experiment_id)
 
 @no_retry
-class SubmitExperimentDataToGemma(TaskWithPriorityMixin, RerunnableTaskMixin, GemmaTask):
+class SubmitExperimentDataToGemma(RerunnableTaskMixin, GemmaTask):
     """
     Submit an experiment to Gemma.
 
@@ -419,7 +419,7 @@ def subcommand_args(self):
     def output(self):
         return GemmaDatasetPlatform(self.experiment_id, self.platform_short_name)
 
-class SubmitExperimentReportToGemma(TaskWithPriorityMixin, WrapperTask, GemmaTask):
+class SubmitExperimentReportToGemma(WrapperTask, GemmaTask):
     """
     Submit an experiment QC report to Gemma.
 
@@ -434,7 +434,7 @@ def run(self):
         pass # do nothing
 
 @requires(SubmitExperimentDataToGemma, SubmitExperimentBatchInfoToGemma, SubmitExperimentReportToGemma)
-class SubmitExperimentToGemma(TaskWithPriorityMixin, TaskWithOutputMixin, WrapperTask):
+class SubmitExperimentToGemma(TaskWithOutputMixin, WrapperTask):
     """
     Submit an experiment data, QC reports, and batch information to Gemma.
 
@@ -448,6 +448,8 @@ class SubmitExperimentToGemma(TaskWithPriorityMixin, TaskWithOutputMixin, Wrappe
     retry_count = 1
     retry_delay = 1200
 
+    priority = luigi.IntParameter(default=100, positional=False, significant=False)
+
     def _targets_to_remove(self):
         outs = []
         # original data
@@ -482,12 +484,12 @@ def complete(self):
         """
         return super().complete() and all(not out.exists() for out in self._targets_to_remove())
 
-class SubmitExperimentsFromDataFrameMixin(TaskWithPriorityMixin):
+class SubmitExperimentsFromDataFrameMixin:
     ignore_priority = luigi.BoolParameter(positional=False, significant=False, description='Ignore the priority column and inherit the priority of the this task. Rows with zero priority are nonetheless ignored.')
     def requires(self):
         df = self._retrieve_dataframe()
         # using None, the worker will inherit the priority from this task for all its dependencies
-        return [SubmitExperimentToGemma(row.experiment_id, priority=None if self.ignore_priority else row.get('priority'), rerun=row.get('data')=='resubmit')
+        return [SubmitExperimentToGemma(row.experiment_id, priority=100 if self.ignore_priority else row.get('priority'), rerun=row.get('data')=='resubmit')
             for _, row in df.iterrows() if row.get('priority', 1) > 0]
 
 class SubmitExperimentsFromFileToGemma(SubmitExperimentsFromDataFrameMixin, TaskWithOutputMixin, WrapperTask):
diff --git a/rnaseq_pipeline/utils.py b/rnaseq_pipeline/utils.py
index b0c09a60..4eb5c3fb 100644
--- a/rnaseq_pipeline/utils.py
+++ b/rnaseq_pipeline/utils.py
@@ -49,10 +49,6 @@ def wrapper(cls):
 
 no_retry = max_retry(0)
 
-class TaskWithPriorityMixin:
-    """Mixin that adds a --priority flag to a given task."""
-    priority = luigi.IntParameter(default=0, positional=False, significant=False)
-
 class RerunnableTaskMixin:
     """
     Mixin for a task that can be rerun regardless of its completion status.