diff --git a/siibra_jugex/__init__.py b/siibra_jugex/__init__.py
index 3be972c..e282cfd 100644
--- a/siibra_jugex/__init__.py
+++ b/siibra_jugex/__init__.py
@@ -1,4 +1,4 @@
-__version__="0.2"
+__version__="0.2.1"
 
 import logging
 logger = logging.getLogger(__name__)
diff --git a/siibra_jugex/jugex.py b/siibra_jugex/jugex.py
index 17cc13b..dac2382 100644
--- a/siibra_jugex/jugex.py
+++ b/siibra_jugex/jugex.py
@@ -297,7 +297,7 @@ def _retrieve_samples(self,regionspec,maptype:siibra.MapType,threshold:float):
                 samples[key]['mnicoord'] = tuple(f.location)
                 samples[key]['region'] = region
                 samples[key][gene_name] =  np.mean(
-                        winsorize(f.z_scores, limits=0.1))
+                        winsorize(np.array(f.z_scores), limits=0.1))
         logger.info('{} samples found for region {}.'.format(
             len(samples), regionspec))
         return samples