diff --git a/isatools/net/ols.py b/isatools/net/ols.py
index 9602508e..955edf6a 100644
--- a/isatools/net/ols.py
+++ b/isatools/net/ols.py
@@ -3,7 +3,7 @@
 
 This module connects to the European Bioinformatics Institute's OLS.
 If you have problems with it, check that it's working at
-http://www.ebi.ac.uk/ols/
+https://www.ebi.ac.uk/ols4/
 """
 from __future__ import absolute_import
 import json
@@ -13,7 +13,7 @@
 from isatools.model import OntologyAnnotation, OntologySource
 
 
-OLS_API_BASE_URI = "http://www.ebi.ac.uk/ols/api"
+OLS_API_BASE_URI = "https://www.ebi.ac.uk/ols4/api"
 OLS_PAGINATION_SIZE = 500
 
 
diff --git a/tests/utils/test_isatools_utils.py b/tests/utils/test_isatools_utils.py
index b7f1a8b2..a36369cc 100644
--- a/tests/utils/test_isatools_utils.py
+++ b/tests/utils/test_isatools_utils.py
@@ -84,10 +84,10 @@ def test_get_ontology(self):
         self.assertEqual(ontology_source.name, 'efo')
         self.assertEqual(
             ontology_source.file,
-            'https://www.ebi.ac.uk/ols/api/ontologies/efo')
+            'https://www.ebi.ac.uk/ols4/api/ontologies/efo?lang=en')
         self.assertIsInstance(ontology_source.version, str)
         self.assertEqual(
-            ontology_source.description, '')
+            ontology_source.description, 'Experimental Factor Ontology')
 
     def test_search_for_term(self):
         ontology_source = ols.get_ols_ontology('efo')