diff --git a/CHANGELOG.md b/CHANGELOG.md
index d8572fc..3b39d4d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,12 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [10.0.1 - 2023-04-13]
+
+## Fixed
+
+- Fixed critical issue on Python versions earlier than 3.10.
+
 ## [10.0.0 - 2023-04-12]
 
 ## Changed
diff --git a/src/sporestack/__init__.py b/src/sporestack/__init__.py
index 28b7b82..bbfe6fe 100644
--- a/src/sporestack/__init__.py
+++ b/src/sporestack/__init__.py
@@ -2,4 +2,4 @@
 
 __all__ = ["api", "api_client", "exceptions"]
 
-__version__ = "10.0.0"
+__version__ = "10.0.1"
diff --git a/src/sporestack/api_client.py b/src/sporestack/api_client.py
index c49ca34..2d3d185 100644
--- a/src/sporestack/api_client.py
+++ b/src/sporestack/api_client.py
@@ -1,7 +1,7 @@
 import logging
 import os
 from dataclasses import dataclass
-from typing import List, Optional
+from typing import List, Optional, Union
 
 import httpx
 from pydantic import parse_obj_as
@@ -134,7 +134,7 @@ class APIClient:
         self,
         machine_id: str,
         days: int,
-        token: str | None = None,
+        token: Union[str, None] = None,
     ) -> None:
         """Topup a server."""
         request = api.ServerTopup.Request(days=days, token=token)