diff --git a/Pipfile b/Pipfile
index 0c8bb874..aed3a8de 100644
--- a/Pipfile
+++ b/Pipfile
@@ -4,7 +4,7 @@ verify_ssl = true
 name = "pypi"
 
 [packages]
-pydantic = "*"
+pydantic = "== 2.*"
 fastapi = "*"
 uvicorn = "*"
 click = "*"
diff --git a/pyproject.toml b/pyproject.toml
index 761e6d51..ca67c218 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -25,7 +25,7 @@ requires-python = ">=3.8"
 description = "VICC normalization routines for genes"
 license = {file = "LICENSE"}
 dependencies = [
-    "pydantic",
+    "pydantic==2.*",
     "fastapi",
     "uvicorn",
     "click",