diff --git a/README.md b/README.md
index 20f236b..17577f4 100644
--- a/README.md
+++ b/README.md
@@ -39,6 +39,8 @@
 
 ## Installation
 
+> **⚠️ Windows 11 Note:** Python 3.13 is not yet supported on Windows 11 due to a known asyncio subprocess issue. Please use Python 3.11 or 3.12. See [Python Issue #122048](https://github.com/python/cpython/issues/122048) for details.
+
 Clone the repository: 
 
 ```bash
diff --git a/pyproject.toml b/pyproject.toml
index 814f2f2..e6e07ed 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -3,7 +3,7 @@ name = "proxy-lite"
 version = "0.1.0"
 description = "Proxy Lite - A mini, open-weights, version of the Convergence AI Proxy assistant."
 readme = "README.md"
-requires-python = ">=3.11"
+requires-python = ">=3.11,<3.13"
 dependencies = [
     "omegaconf>=2.3.0",
     "openai>=1.61.1",