diff --git a/.github/workflows/pytest.yml b/.github/workflows/pytest.yml
index 2f30f01..d969824 100644
--- a/.github/workflows/pytest.yml
+++ b/.github/workflows/pytest.yml
@@ -8,7 +8,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ["3.11", "3.12"]
+        python-version: ["3.9", "3.10", "3.11", "3.12"]
 
     steps:
       - uses: actions/checkout@v4
diff --git a/neon_api/client.py b/neon_api/client.py
index a1f20d0..6a90511 100644
--- a/neon_api/client.py
+++ b/neon_api/client.py
@@ -183,8 +183,8 @@ class NeonAPI:
         self,
         *,
         shared: bool = False,
-        cursor: str | None = None,
-        limit: int | None = None,
+        cursor: str = None,
+        limit: int = None,
     ) -> t.List[t.Dict[str, t.Any]]:
         """Get a list of projects. If shared is True, get a list of shared projects.
 
@@ -297,8 +297,8 @@ class NeonAPI:
         self,
         project_id: str,
         *,
-        cursor: str | None = None,
-        limit: int | None = None,
+        cursor: str = None,
+        limit: int = None,
     ) -> t.Dict[str, t.Any]:
         """Get a list of branches.
 
@@ -400,8 +400,8 @@ class NeonAPI:
         project_id: str,
         branch_id: str,
         *,
-        cursor: str | None = None,
-        limit: int | None = None,
+        cursor: str = None,
+        limit: int = None,
     ) -> t.List[t.Dict[str, t.Any]]:
         """Get a list of databases.
 
@@ -741,8 +741,8 @@ class NeonAPI:
         self,
         project_id: str,
         *,
-        cursor: str | None = None,
-        limit: int | None = None,
+        cursor: str = None,
+        limit: int = None,
     ) -> t.Dict[str, t.Any]:
         """Get a list of operations.
 
@@ -778,10 +778,10 @@ class NeonAPI:
     def consumption(
         self,
         *,
-        cursor: str | None = None,
-        limit: int | None = None,
-        from_date: datetime | str | None = None,
-        to_date: datetime | str | None = None,
+        cursor: str = None,
+        limit: int = None,
+        from_date: datetime = None,
+        to_date: datetime = None,
     ) -> t.Dict[str, t.Any]:
         """Experimental — get a list of consumption metrics for all projects.
 
diff --git a/setup.py b/setup.py
index 38b7a41..40ebd98 100644
--- a/setup.py
+++ b/setup.py
@@ -17,7 +17,7 @@ DESCRIPTION = "An API Client for the Neon API."
 URL = "https://github.com/kennethreitz/neon-api-python"
 EMAIL = "me@kennethreitz.org"
 AUTHOR = "Kenneth Reitz"
-REQUIRES_PYTHON = ">=3.10.0"
+REQUIRES_PYTHON = ">=3.9.0"
 VERSION = "0.1.1"
 
 # What packages are required for this module to be executed?
@@ -117,6 +117,7 @@ setup(
         "License :: OSI Approved :: Apache Software License",
         "Programming Language :: Python",
         "Programming Language :: Python :: 3",
+        "Programming Language :: Python :: 3.9",
         "Programming Language :: Python :: 3.10",
         "Programming Language :: Python :: 3.11",
         "Programming Language :: Python :: 3.12",