diff --git a/setup.cfg b/setup.cfg
index d377aa7..2e4a5cb 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -75,8 +75,6 @@ tests =
     coverage
 pandas =
     pandas
-bioregistry =
-    bioregistry>=0.5.136
 flask =
     flask
     defusedxml
diff --git a/tests/test_api.py b/tests/test_api.py
index ee80bda..291e999 100644
--- a/tests/test_api.py
+++ b/tests/test_api.py
@@ -10,7 +10,6 @@
 
 import pandas as pd
 import rdflib
-from bioregistry.export.prefix_maps import EXTENDED_PREFIX_MAP_PATH
 
 from curies.api import (
     CompressionError,
@@ -209,16 +208,6 @@ def assert_bioregistry_converter(self, converter: Converter) -> None:
         self.assertIn(chebi_uri, converter.reverse_prefix_map)
         self.assertEqual("chebi", converter.reverse_prefix_map[chebi_uri])
 
-    @unittest.skipUnless(
-        EXTENDED_PREFIX_MAP_PATH.is_file(),
-        reason="missing local, editable installation of the Bioregistry",
-    )
-    def test_bioregistry_editable(self):
-        """Test loading the bioregistry extended prefix map locally."""
-        records = json.loads(EXTENDED_PREFIX_MAP_PATH.read_text())
-        converter = Converter.from_extended_prefix_map(records)
-        self.assert_bioregistry_converter(converter)
-
     def test_load_path(self):
         """Test loading from paths."""
         with tempfile.TemporaryDirectory() as directory:
diff --git a/tox.ini b/tox.ini
index f55741e..dc729f3 100644
--- a/tox.ini
+++ b/tox.ini
@@ -38,7 +38,6 @@ commands =
 extras =
     tests
     pandas
-    bioregistry
     flask
     fastapi
     rdflib