diff --git a/setup.cfg b/setup.cfg
index c4db541f5..02bf0d3db 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -51,7 +51,7 @@ install_requires =
     pystow>=0.1.13
     click
     more_click>=0.1.2
-    pydantic
+    pydantic<2.0
     curies>=0.5.1
 
 zip_safe = false