diff --git a/yli/utils.py b/yli/utils.py
index d413f3f..937a36b 100644
--- a/yli/utils.py
+++ b/yli/utils.py
@@ -74,6 +74,10 @@ def convert_pandas_nullable(df):
 			if df_cleaned is None:
 				df_cleaned = df.copy()
 			df_cleaned[col] = df[col].astype(str(df[col].dtype).lower())
+		elif df[col].dtype == 'boolean':
+			if df_cleaned is None:
+				df_cleaned = df.copy()
+			df_cleaned[col] = df[col].astype('bool')
 	
 	if df_cleaned is None:
 		return df