diff --git a/requirements.txt b/requirements.txt
index 75be2f0..a72a851 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1 +1,2 @@
 enforce_typing
+frozendict
diff --git a/setup.py b/setup.py
index dc3f026..5e057ac 100644
--- a/setup.py
+++ b/setup.py
@@ -44,4 +44,6 @@ setup(
     extras_require={
         'test': read_requirements('requirements_test.txt'),
     },
+    license="MIT",
+    python_requires=">=3.9",
 )