diff --git a/docs/user-guide/loki/workflow-widget-loki.ipynb b/docs/user-guide/loki/workflow-widget-loki.ipynb
index 7c8c3a83..93eaeb36 100644
--- a/docs/user-guide/loki/workflow-widget-loki.ipynb
+++ b/docs/user-guide/loki/workflow-widget-loki.ipynb
@@ -60,10 +60,10 @@
     "pbox = wfw.parameter_box\n",
     "pbox.parameter_refresh_button.click()\n",
     "# Enable DirectBeam input\n",
-    "pbox._input_widgets[DirectBeam].children[0].enabled = True\n",
-    "pbox._input_widgets[DirectBeam].children[0].wrapped._option_box.value = None\n",
+    "pbox._input_widgets[DirectBeam].children[0].value = True\n",
+    "pbox._input_widgets[DirectBeam].children[1].children[1]._option_box.value = None\n",
     "# Adjust Q range\n",
-    "pbox._input_widgets[QBins].children[0].fields[\"start\"].value = 0.01\n",
+    "pbox._input_widgets[QBins].fields[\"start\"].value = 0.01\n",
     "# Run the workflow\n",
     "rbox = wfw.result_box\n",
     "rbox.run_button.click()"
diff --git a/pyproject.toml b/pyproject.toml
index efe0b867..37385196 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -32,7 +32,7 @@ requires-python = ">=3.10"
 dependencies = [
   "dask",
   "graphviz",
-  "essreduce>=24.10.2, <24.11.0",
+  "essreduce>=24.11.3",
   "numpy",
   "pandas",
   "plopp",
diff --git a/requirements/base.in b/requirements/base.in
index 3a21abf1..dc371692 100644
--- a/requirements/base.in
+++ b/requirements/base.in
@@ -4,7 +4,7 @@
 # The following was generated by 'tox -e deps', DO NOT EDIT MANUALLY!
 dask
 graphviz
-essreduce>=24.10.2, <24.11.0
+essreduce>=24.11.3
 numpy
 pandas
 plopp
diff --git a/requirements/base.txt b/requirements/base.txt
index 670dc877..da532947 100644
--- a/requirements/base.txt
+++ b/requirements/base.txt
@@ -1,4 +1,4 @@
-# SHA1:01b4e247f3980e3f21b6b9ad70d3e5e49610d9c4
+# SHA1:71fbc763453db59fbe23acb0df92531c0434f7ef
 #
 # This file is autogenerated by pip-compile-multi
 # To update, run:
@@ -23,13 +23,13 @@ dask==2025.1.0
     # via -r base.in
 decorator==5.1.1
     # via ipython
-essreduce==24.10.3
+essreduce==24.12.0
     # via -r base.in
 exceptiongroup==1.2.2
     # via ipython
-executing==2.1.0
+executing==2.2.0
     # via stack-data
-fonttools==4.55.3
+fonttools==4.55.5
     # via matplotlib
 fsspec==2024.12.0
     # via dask
@@ -130,7 +130,9 @@ scipp==25.1.0
     #   scippneutron
     #   scippnexus
 scippneutron==25.1.0
-    # via -r base.in
+    # via
+    #   -r base.in
+    #   essreduce
 scippnexus==24.11.1
     # via
     #   -r base.in
@@ -160,7 +162,7 @@ traittypes==0.2.1
     # via ipydatawidgets
 typing-extensions==4.12.2
     # via ipython
-tzdata==2024.2
+tzdata==2025.1
     # via pandas
 wcwidth==0.2.13
     # via prompt-toolkit
diff --git a/requirements/ci.txt b/requirements/ci.txt
index 3b26f277..9ffaa1db 100644
--- a/requirements/ci.txt
+++ b/requirements/ci.txt
@@ -5,7 +5,7 @@
 #
 #    pip-compile-multi
 #
-cachetools==5.5.0
+cachetools==5.5.1
     # via tox
 certifi==2024.12.14
     # via requests
@@ -17,7 +17,7 @@ colorama==0.4.6
     # via tox
 distlib==0.3.9
     # via virtualenv
-filelock==3.16.1
+filelock==3.17.0
     # via
     #   tox
     #   virtualenv
@@ -38,7 +38,7 @@ platformdirs==4.3.6
     #   virtualenv
 pluggy==1.5.0
     # via tox
-pyproject-api==1.8.0
+pyproject-api==1.9.0
     # via tox
 requests==2.32.3
     # via -r ci.in
@@ -48,7 +48,7 @@ tomli==2.2.1
     # via
     #   pyproject-api
     #   tox
-tox==4.23.2
+tox==4.24.1
     # via -r ci.in
 typing-extensions==4.12.2
     # via tox
diff --git a/requirements/dev.txt b/requirements/dev.txt
index 6b109ba2..448ba646 100644
--- a/requirements/dev.txt
+++ b/requirements/dev.txt
@@ -87,7 +87,7 @@ prometheus-client==0.21.1
     # via jupyter-server
 pycparser==2.22
     # via cffi
-pydantic==2.10.5
+pydantic==2.10.6
     # via copier
 pydantic-core==2.27.2
     # via pydantic
diff --git a/requirements/nightly.txt b/requirements/nightly.txt
index ae202219..9b960561 100644
--- a/requirements/nightly.txt
+++ b/requirements/nightly.txt
@@ -26,9 +26,9 @@ decorator==5.1.1
     # via ipython
 essreduce @ git+https://github.com/scipp/essreduce@main
     # via -r nightly.in
-executing==2.1.0
+executing==2.2.0
     # via stack-data
-fonttools==4.55.3
+fonttools==4.55.5
     # via matplotlib
 fsspec==2024.12.0
     # via dask
@@ -140,7 +140,7 @@ traittypes==0.2.1
     # via ipydatawidgets
 typing-extensions==4.12.2
     # via ipython
-tzdata==2024.2
+tzdata==2025.1
     # via pandas
 wcwidth==0.2.13
     # via prompt-toolkit
diff --git a/requirements/static.txt b/requirements/static.txt
index cf2b5a96..b7eb0124 100644
--- a/requirements/static.txt
+++ b/requirements/static.txt
@@ -9,7 +9,7 @@ cfgv==3.4.0
     # via pre-commit
 distlib==0.3.9
     # via virtualenv
-filelock==3.16.1
+filelock==3.17.0
     # via virtualenv
 identify==2.6.6
     # via pre-commit
diff --git a/src/ess/loki/workflow.py b/src/ess/loki/workflow.py
index 73aa7e0a..cd257beb 100644
--- a/src/ess/loki/workflow.py
+++ b/src/ess/loki/workflow.py
@@ -14,23 +14,31 @@
 from ess.sans.parameters import typical_outputs
 
 from ..sans.types import (
+    BackgroundRun,
+    BeamCenter,
     DetectorBankSizes,
     DetectorData,
     DetectorPixelShape,
     DirectBeam,
     DirectBeamFilename,
+    EmptyBeamRun,
+    Filename,
     Incident,
     MonitorData,
     MonitorType,
     NeXusComponent,
+    NeXusDetectorName,
     NeXusMonitorName,
     NonBackgroundWavelengthRange,
+    PixelMaskFilename,
     PixelShapePath,
     RunType,
+    SampleRun,
     ScatteringRunType,
     TofData,
     TofMonitor,
     Transmission,
+    TransmissionRun,
 )
 
 DETECTOR_BANK_SIZES = {
@@ -105,7 +113,7 @@ def LokiAtLarmorWorkflow() -> sciline.Pipeline:
     for key, param in default_parameters().items():
         workflow[key] = param
     workflow.insert(read_xml_detector_masking)
-    workflow[sans.types.NeXusDetectorName] = 'larmor_detector'
+    workflow[NeXusDetectorName] = 'larmor_detector'
     workflow.typical_outputs = typical_outputs
     return workflow
 
@@ -115,25 +123,14 @@ def LokiAtLarmorTutorialWorkflow() -> sciline.Pipeline:
     from ess.loki import data
 
     workflow = LokiAtLarmorWorkflow()
-    # TODO This does not work with multiple
-    workflow[sans.types.PixelMaskFilename] = data.loki_tutorial_mask_filenames()[0]
 
-    workflow[sans.types.Filename[sans.types.SampleRun]] = (
-        data.loki_tutorial_sample_run_60339()
-    )
-    workflow[sans.types.Filename[sans.types.BackgroundRun]] = (
-        data.loki_tutorial_background_run_60393()
-    )
-    workflow[sans.types.Filename[sans.types.TransmissionRun[sans.types.SampleRun]]] = (
+    workflow[PixelMaskFilename] = data.loki_tutorial_mask_filenames()
+    workflow[Filename[SampleRun]] = data.loki_tutorial_sample_run_60339()
+    workflow[Filename[BackgroundRun]] = data.loki_tutorial_background_run_60393()
+    workflow[Filename[TransmissionRun[SampleRun]]] = (
         data.loki_tutorial_sample_transmission_run()
     )
-    workflow[
-        sans.types.Filename[sans.types.TransmissionRun[sans.types.BackgroundRun]]
-    ] = data.loki_tutorial_run_60392()
-    workflow[sans.types.Filename[sans.types.EmptyBeamRun]] = (
-        data.loki_tutorial_run_60392()
-    )
-    workflow[sans.types.BeamCenter] = sc.vector(
-        value=[-0.02914868, -0.01816138, 0.0], unit='m'
-    )
+    workflow[Filename[TransmissionRun[BackgroundRun]]] = data.loki_tutorial_run_60392()
+    workflow[Filename[EmptyBeamRun]] = data.loki_tutorial_run_60392()
+    workflow[BeamCenter] = sc.vector(value=[-0.02914868, -0.01816138, 0.0], unit='m')
     return workflow
diff --git a/src/ess/sans/parameters.py b/src/ess/sans/parameters.py
index 4aaef525..350791f3 100644
--- a/src/ess/sans/parameters.py
+++ b/src/ess/sans/parameters.py
@@ -54,6 +54,7 @@
     CorrectForGravity, default=False
 )
 parameter_registry[NeXusDetectorName] = StringParameter.from_type(NeXusDetectorName)
+
 parameter_registry[NeXusMonitorName[Incident]] = StringParameter.from_type(
     NeXusMonitorName[Incident], default=''
 )
@@ -76,10 +77,10 @@
 parameter_registry[UncertaintyBroadcastMode] = ParamWithOptions.from_enum(
     UncertaintyBroadcastMode, default=UncertaintyBroadcastMode.upper_bound
 )
-parameter_registry[Filename[SampleRun]] = FilenameParameter.from_type(
+parameter_registry[Filename[SampleRun]] = MultiFilenameParameter.from_type(
     Filename[SampleRun]
 )
-parameter_registry[Filename[BackgroundRun]] = FilenameParameter.from_type(
+parameter_registry[Filename[BackgroundRun]] = MultiFilenameParameter.from_type(
     Filename[BackgroundRun]
 )
 parameter_registry[Filename[TransmissionRun[SampleRun]]] = FilenameParameter.from_type(
@@ -91,6 +92,7 @@
 parameter_registry[Filename[EmptyBeamRun]] = FilenameParameter.from_type(
     Filename[EmptyBeamRun]
 )
+
 parameter_registry[WavelengthBins] = BinEdgesParameter(
     WavelengthBins, dim='wavelength', start=2, stop=12.0, nbins=300, log=False
 )
diff --git a/src/ess/sans/workflow.py b/src/ess/sans/workflow.py
index 15a1a567..e01b81aa 100644
--- a/src/ess/sans/workflow.py
+++ b/src/ess/sans/workflow.py
@@ -140,7 +140,10 @@ def with_background_runs(
 
 
 parameter_mappers[PixelMaskFilename] = with_pixel_mask_filenames
-parameter_mappers[NeXusDetectorName] = with_banks
+# TODO: for now, we leave the mapping over detector banks out, because we do not have a
+# method to merge the I(Q) of different banks, and we thus cannot compute a single
+# result from the workflow. So only a single detector bank can be processed at a time.
+# parameter_mappers[NeXusDetectorName] = with_banks
 parameter_mappers[Filename[SampleRun]] = with_sample_runs
 parameter_mappers[Filename[BackgroundRun]] = with_background_runs