diff --git a/config/sbatch.yml b/config/sbatch.yml
index 4127599..b2d6279 100644
--- a/config/sbatch.yml
+++ b/config/sbatch.yml
@@ -96,7 +96,7 @@ assigned_counts_createAssignmentPickleFile:
 assigned_counts_filterAssignment:
   time: "0-01:00"
   queue: "medium"
-  mem: 10G
+  mem: 15G
 
 #################
 ### Statistic ###
diff --git a/workflow/scripts/count/nucleotideCountPerPosition.py b/workflow/scripts/count/nucleotideCountPerPosition.py
index 66d5118..ef9baee 100644
--- a/workflow/scripts/count/nucleotideCountPerPosition.py
+++ b/workflow/scripts/count/nucleotideCountPerPosition.py
@@ -58,7 +58,7 @@ def cli(input_file, column, use_header, output_file, chunksize):
 
             nucleotides = df["DNA"].apply(lambda x: pd.Series(list(x)))
 
-            for i, columns in nucleotides.iteritems():
+            for i, columns in nucleotides.items():
                 counts_column = "Position_%d_counts" % (i+1)
                 ratio_column = "Position_%d_ratio" % (i+1)
                 if counts_column not in output.columns: