diff --git a/pyproject.toml b/pyproject.toml
index 8e5aff1..b7c03cf 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "phenotype2phenopacket"
-version = "0.6.1"
+version = "0.6.2"
 description = ""
 authors = ["Yasemin Bridges <y.bridges@qmul.ac.uk>"]
 readme = "README.md"
diff --git a/src/phenotype2phenopacket/utils/utils.py b/src/phenotype2phenopacket/utils/utils.py
index 0b5a34a..4890f50 100644
--- a/src/phenotype2phenopacket/utils/utils.py
+++ b/src/phenotype2phenopacket/utils/utils.py
@@ -36,7 +36,7 @@ def read_genes_to_disease(genes_to_disease: Path) -> pl.DataFrame:
     Returns:
         pl.DataFrame: A  Polars DataFrame containing the contents of the genes_to_disease.txt.
     """
-    return pl.read_csv(genes_to_disease, sep="\t")
+    return pl.read_csv(genes_to_disease, separator="\t")
 
 
 def load_ontology(local_cached_ontology: Path = None):