diff --git a/Pipfile b/Pipfile
index d4629d72..32e168b1 100644
--- a/Pipfile
+++ b/Pipfile
@@ -11,7 +11,7 @@ pyliftover = "*"
 polars = "*"
 hgvs = "*"
 "biocommons.seqrepo" = "*"
-pydantic = "*"
+pydantic = "~=2.4.2"
 fastapi = "*"
 uvicorn = "*"
 "ga4gh.vrs" = "*"
diff --git a/setup.cfg b/setup.cfg
index aa942d9b..1cf9e784 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -20,7 +20,7 @@ install_requires =
     polars
     hgvs
     biocommons.seqrepo
-    pydantic
+    pydantic ~= 2.4.2
     uvicorn
     fastapi
     ga4gh.vrs