diff --git a/poetry.lock b/poetry.lock
index efb6ceeb6..aaba0dfc1 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -5298,46 +5298,46 @@ stats = ["scipy (>=1.3)", "statsmodels (>=0.10)"]
 
 [[package]]
 name = "semsimian"
-version = "0.2.13"
+version = "0.2.15"
 description = "Sematic similarity calculations for ontologies implemented in Rust."
 optional = true
 python-versions = ">=3.7"
 files = [
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 ]
 
 [[package]]
@@ -6563,4 +6563,4 @@ semsimian = ["semsimian"]
 [metadata]
 lock-version = "2.0"
 python-versions = ">=3.9,<4.0.0"
-content-hash = "4741a5db8b062457de5bc6ea86107f2a816cfa25f4bf29d4cee1cd9a66cb120d"
+content-hash = "1a7d5a135ecd6016d915620c07c4094acd2fc55b0a0e6d90db22d59953ceb16f"
diff --git a/pyproject.toml b/pyproject.toml
index 86d8b1992..de91464e4 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -23,7 +23,7 @@ kgcl-schema = "^0.6.5"
 
 funowl = ">=0.2.0"
 gilda = {version = ">=1.0.0", optional = true}
-semsimian = {version = ">=0.1.0", optional = true}
+semsimian = {version = ">=0.2.15", optional = true}
 kgcl-rdflib = "0.5.0"
 llm = {version = "*", optional = true}
 aiohttp = {version = "*", optional = true}
diff --git a/tests/test_implementations/test_bioportal.py b/tests/test_implementations/test_bioportal.py
index 2b2ebf7d1..2b6eba82b 100644
--- a/tests/test_implementations/test_bioportal.py
+++ b/tests/test_implementations/test_bioportal.py
@@ -1,6 +1,7 @@
 import itertools
 import logging
 import unittest
+from unittest import mock
 
 from linkml_runtime.dumpers import yaml_dumper
 from oaklib.implementations.ontoportal.bioportal_implementation import (
@@ -75,11 +76,35 @@ def test_ontology_versions(self):
         self.assertIn("5.0.0", versions)
         self.assertIn("v3.2.1", versions)
 
-    def test_ontology_metadata(self):
+    @mock.patch("oaklib.implementations.ontoportal.bioportal_implementation.BioPortalImplementation")
+    def test_ontology_metadata(self, mock_impl):
+        mock_impl.return_value = {
+            "id": "OBI",
+            "title": "Ontology for Biomedical Investigations",
+            "hasOntologyLanguage": "OWL",
+            "released": "2024-01-22T18:11:12-08:00",
+            "creationDate": "2024-01-22T18:11:18-08:00",
+            "homepage": "http://purl.obolibrary.org/obo/obi",
+            "publication": "http://purl.obolibrary.org/obo/obi/Technical_Reports",
+            "documentation": "http://purl.obolibrary.org/obo/obi/wiki",
+            "version": "2024-01-09",
+            "description": 'OBI is an ontology of investigations, the protocols and instrumentation used,\
+                the material used, the data generated and the types of analysis performed on it.\
+                <br><br>\r\nTo import,<br>\r\nLatest version:\
+                <a href="http://purl.obolibrary.org/obo/obi.owl">http://purl.obolibrary.org/obo/obi.owl</a><br>\
+                \r\n<br>\r\nLatest release notes at <a href="http://purl.obolibrary.org/obo/obi/release-notes.html">\
+                http://purl.obolibrary.org/obo/obi/release-notes.html</a><br>\r\n<br>\r\nNote: BFO 2.0 pre-Graz\
+                      release (not official release version) was used in this release.',
+            "status": "production",
+            "submissionId": 53,
+            "submission_uri": "https://data.bioontology.org/ontologies/OBI/submissions/53",
+            "type": "http://data.bioontology.org/metadata/OntologySubmission",
+        }
         metadata = self.impl.ontology_metadata_map("OBI")
         self.assertIn("title", metadata)
         self.assertEqual(metadata["title"], "Ontology for Biomedical Investigations")
         self.assertIn("homepage", metadata)
         self.assertEqual(metadata["homepage"], "http://purl.obolibrary.org/obo/obi")
-        self.assertIn("classes", metadata)
-        self.assertIsInstance(metadata["classes"], int)
+        # ! The following test is commented out because the metadata does not have the "classes" fields any more.
+        # self.assertIn("classes", metadata)
+        # self.assertIsInstance(metadata["classes"], int)