diff --git a/fmriprep/interfaces/reports.py b/fmriprep/interfaces/reports.py
index 64edda47..76d91a36 100644
--- a/fmriprep/interfaces/reports.py
+++ b/fmriprep/interfaces/reports.py
@@ -233,7 +233,7 @@ class FunctionalSummaryInputSpec(TraitedSpec):
         traits.Enum('lr_flip_warning', 'cost_original', 'cost_flipped'),
         traits.Either(traits.Bool(), traits.Float()),
         desc='Left-right flip check warning and registration costs',
-        mandatory=True
+        mandatory=True,
     )
     tr = traits.Float(desc='Repetition time', mandatory=True)
     dummy_scans = traits.Either(traits.Int(), None, desc='number of dummy scans specified by user')
@@ -415,7 +415,7 @@ class _CheckFlipOutputSpec(TraitedSpec):
         traits.Enum('warning', 'cost_original', 'cost_flipped'),
         traits.Either(traits.Bool(), traits.Float()),
         desc='Left-right flip check warning and registration costs',
-        mandatory=True
+        mandatory=True,
     )
 
 
diff --git a/fmriprep/workflows/bold/registration.py b/fmriprep/workflows/bold/registration.py
index 0c71eeb7..ff9ce30c 100644
--- a/fmriprep/workflows/bold/registration.py
+++ b/fmriprep/workflows/bold/registration.py
@@ -607,9 +607,16 @@ def init_fsl_bbr_wf(
     )
 
     def flip_detection_not_implemented_yet():
-        return {'warning': 'Flip detection not implemented yet for alignment with FSL flirt', 'cost_original': '', 'cost_flipped': ''}
-
-    check_flip = pe.Node(niu.Function(function=flip_detection_not_implemented_yet, output_names=['flip_info']), name='check_flip')
+        return {
+            'warning': 'Flip detection not implemented yet for alignment with FSL flirt',
+            'cost_original': '',
+            'cost_flipped': '',
+        }
+
+    check_flip = pe.Node(
+        niu.Function(function=flip_detection_not_implemented_yet, output_names=['flip_info']),
+        name='check_flip',
+    )
     # fmt:off
     workflow.connect([
         (inputnode, mask_t1w_brain, [('t1w_preproc', 'in_file'),
diff --git a/requirements.txt b/requirements.txt
index 1f94ac07..a17a801b 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -198,7 +198,7 @@ nitransforms==23.0.1
     # via
     #   niworkflows
     #   sdcflows
-niworkflows==1.10.2
+niworkflows @ git+https://github.com/celprov/niworkflows@enh/flip_image
     # via
     #   sdcflows
     #   smriprep