diff --git a/pyproject.toml b/pyproject.toml
index ebdaa027ed..ef70615da2 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -52,7 +52,7 @@ requests = ">=2.20.0,<3.0.0"
 click = ">=7.1.1,<9.0.0"
 rich = ">=10.11.0,<14.0.0"
 strictyaml = ">=1.7.0,<2.0.0" # CVE-2020-14343 was fixed in 5.4.
-pydantic = ">=2.0,<3.0"
+pydantic = ">=2.0,<3.0,!=2.4.0,!=2.4.1" # 2.4.0, 2.4.1 has a critical bug
 sortedcontainers = "2.4.0"
 fsspec = ">=2023.1.0,<2024.1.0"
 pyparsing = ">=3.1.0,<4.0.0"