diff --git a/requirements.txt b/requirements.txt
index 5f29626..ce0a030 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -10,7 +10,7 @@ unicodecsv==0.14.1
 openpyxl>=2.4,<2.5
 # Para consultar programáticamente la API de CKAN
 ckanapi==4.0
-urllib3==1.22
+urllib3
 Unidecode==0.4.21
-six==1.11.0
+six
 python-dateutil==2.6.1
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