diff --git a/setup.cfg b/setup.cfg
index 8005d36..023108a 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -33,7 +33,7 @@ setup_requires =
     setuptools_scm
 install_requires =
     requests>=2.27.0
-    pydantic>=1.9.1
+    pydantic>=1.9.1,<2
 
 [options.extras_require]
 tests =