diff --git a/src/pyFAI/io/integration_config.py b/src/pyFAI/io/integration_config.py
index 874b12564..33c06950e 100644
--- a/src/pyFAI/io/integration_config.py
+++ b/src/pyFAI/io/integration_config.py
@@ -52,6 +52,7 @@
 
 5: Migrate to dataclass
    Support for integrator_name/integrator_method and extra_options.
+   rename some attributes
 
 In a similar way, PixelwiseWorkerConfig and DistortionWorkerConfig are dataclasses
 to hold parameters for handling PixelwiseWorker and DistortionWorker, respectively.
@@ -65,6 +66,7 @@
 __date__ = "20/12/2024"
 __docformat__ = 'restructuredtext'
 
+import sys
 import os
 import json
 import logging
@@ -80,9 +82,14 @@
 from ..integrator import load_engines as load_integrators
 
 _logger = logging.getLogger(__name__)
-
 CURRENT_VERSION = 5
 
+if sys.version_info>=(3,10):
+    mydataclass = dataclass(slots=True)
+else:
+    mydataclass = dataclass
+
+
 def _normalize_v1_darkflat_files(config, key):
     """Normalize dark and flat filename list from the version 1 to version 2.
     """
@@ -411,7 +418,7 @@ def pop_method(self, default=None):
         return method
 
 
-@dataclass(slots=True)
+@mydataclass
 class WorkerConfig:
     """Class with the configuration from the worker."""
     application: str="worker"
@@ -479,10 +486,6 @@ def from_dict(cls, dico, inplace=False):
         return self
 
 
-    def _upgrade(self):
-        """Upgrade an elder version of the config ot the latest one"""
-        pass
-
     def save(self, filename):
         """Dump the content of the dataclass as JSON file"""
         with open(filename, "w") as w:
diff --git a/src/pyFAI/test/test_worker.py b/src/pyFAI/test/test_worker.py
index 7f9d400f7..ae22db0d0 100644
--- a/src/pyFAI/test/test_worker.py
+++ b/src/pyFAI/test/test_worker.py
@@ -32,7 +32,7 @@
 __contact__ = "valentin.valls@esrf.fr"
 __license__ = "MIT"
 __copyright__ = "European Synchrotron Radiation Facility, Grenoble, France"
-__date__ = "04/07/2024"
+__date__ = "20/12/2024"
 
 import unittest
 import logging
@@ -46,7 +46,7 @@
 from ..integrator.azimuthal import AzimuthalIntegrator
 from ..containers import Integrate1dResult
 from ..containers import Integrate2dResult
-from ..io.integration_config import ConfigurationReader
+from ..io.integration_config import ConfigurationReader, WorkerConfig
 from ..io.ponifile import PoniFile
 from .. import detector_factory
 from . import utilstest
@@ -557,6 +557,15 @@ def test_v3_equal_to_v4(self):
         poni_v4_from_config = PoniFile(data=config_v4)
         self.assertEqual(poni_v3_from_config.as_dict(), poni_v4_from_config.as_dict(), "PONI dictionaries from config match")
 
+    def test_dataclass(self):
+        test_files = "0.14_verson0.json  id11_v0.json  id13_v0.json  id15_1_v0.json  id15_v0.json  id16_v3.json  id21_v0.json  version0.json    version3.json  version4.json"
+        for fn in test_files.split():
+            js = utilstest.UtilsTest.getimage(fn)
+            with utilstest.TestLogging(logger='pyFAI.io.integrarion_config', warning=0):
+            # with self.assertLogs('pyFAI.io.integrarion_config', level='WARNING') as cm:
+                wc = WorkerConfig.load(js)
+            self.assertEqual(wc, WorkerConfig.from_dict(wc.as_dict()), f"Idempotent {fn}")
+
 
 
 
diff --git a/src/pyFAI/worker.py b/src/pyFAI/worker.py
index 76193ac63..5c565682c 100644
--- a/src/pyFAI/worker.py
+++ b/src/pyFAI/worker.py
@@ -82,7 +82,7 @@
 __contact__ = "Jerome.Kieffer@ESRF.eu"
 __license__ = "MIT"
 __copyright__ = "European Synchrotron Radiation Facility, Grenoble, France"
-__date__ = "03/07/2024"
+__date__ = "20/12/2024"
 __status__ = "development"
 
 import threading
@@ -463,10 +463,11 @@ def set_config(self, config, consume_keys=False):
             consumed when used.
         """
         config = integration_config.normalize(config, inplace=consume_keys, do_raise=False)
+        print(config)
         _init_ai(self.ai, config, consume_keys=True, read_maps=False)
 
         # Do it here before reading the AI to be able to catch the io
-        filename = config.pop("mask_file", "")
+        filename = config.pop("mask_image", "")
         apply_process = config.pop("do_mask", True)
         if filename and apply_process:
             try:
@@ -478,24 +479,24 @@ def set_config(self, config, consume_keys=False):
                 self.mask_image = filename
 
         # Do it here while we have to store metadata
-        filename = config.pop("dark_current", "")
+        filename = config.pop("dark_current_image", "")
         apply_process = config.pop("do_dark", True)
         if filename and apply_process:
             filenames = _normalize_filenames(filename)
             method = "mean"
             data = _reduce_images(filenames, method=method)
             self.ai.detector.set_darkcurrent(data)
-            self.dark_current_image = "%s(%s)" % (method, ",".join(filenames))
+            self.dark_current_image = filenames #"%s(%s)" % (method, ",".join(filenames))
 
         # Do it here while we have to store metadata
-        filename = config.pop("flat_field", "")
+        filename = config.pop("flat_field_image", "")
         apply_process = config.pop("do_flat", True)
         if filename and apply_process:
             filenames = _normalize_filenames(filename)
             method = "mean"
             data = _reduce_images(filenames, method=method)
             self.ai.detector.set_flatfield(data)
-            self.flat_field_image = "%s(%s)" % (method, ",".join(filenames))
+            self.flat_field_image = filenames# "%s(%s)" % (method, ",".join(filenames))
 
         # Uses it anyway in case do_2D is customed after the configuration
         value = config.pop("nbpt_azim", None)