diff --git a/pyproject.toml b/pyproject.toml
index bdd60865..bfd89c52 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -15,6 +15,7 @@ maintainers = [
     {name = "Adyen", email = "support@adyen.com"},
 ]
 keywords = ["payments", "adyen", "fintech"]
+dependencies = ["pydantic>=2.0"]
 classifiers = [
     "Development Status :: 5 - Production/Stable",
     "Intended Audience :: Developers",