diff --git a/requirements_dev.txt b/requirements_dev.txt
index 7ac5cad..edf794d 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -4,7 +4,6 @@ python-dateutil==2.8.2
 freezegun==1.2.1
 pdoc==12.1.0
 pip==22.1.2
-pydantic==1.9.1
 pylint==2.14.4
 pytest==7.1.2
 pytest-cov==3.0.0
diff --git a/setup.cfg b/setup.cfg
index af56d91..c7731b4 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -19,6 +19,7 @@ python_requires = >= 3.9
 install_requires =
   python-dateutil>=2.8.2
   tzdata>=2022.1
+  pydantic>=1.9.1
 include_package_data = True
 package_dir =
     = .