diff --git a/setup.py b/setup.py
index 7d219fa..7a34af6 100644
--- a/setup.py
+++ b/setup.py
@@ -45,7 +45,7 @@ def readme():
             'gtdbtk = gtdbtk.__main__:main'
         ]
     },
-    install_requires=["dendropy>=4.1.0", 'numpy>=1.9.0', 'tqdm>=4.35.0', 'pydantic>=1.9.2,<2'],
+    install_requires=["dendropy>=4.1.0", 'numpy>=1.9.0', 'tqdm>=4.35.0', 'pydantic>=1.9.2,<2.0a1'],
     license=meta['license'],
     long_description=readme(),
     long_description_content_type='text/markdown',