diff --git a/README.md b/README.md
index 40ae62b6..1c6eff95 100644
--- a/README.md
+++ b/README.md
@@ -155,6 +155,8 @@ _Libraries for building AI applications, LLM integrations, and autonomous agents
 - Model Context Protocol
   - [mcp](https://github.com/modelcontextprotocol/python-sdk) - The official Python SDK for building Model Context Protocol servers and clients.
   - [fastmcp](https://github.com/PrefectHQ/fastmcp) - A high-level, Pythonic framework for building MCP servers and clients.
+- Code Sandboxes
+  - [pydantic-monty](https://github.com/pydantic/monty) - A secure Python sandbox written in Rust for running AI-written code.
 - Personal Assistants
   - [hermes-agent](https://github.com/NousResearch/hermes-agent) - An adaptive personal AI assistant that grows with you.
   - [AstrBot](https://github.com/AstrBotDevs/AstrBot) - A multi-platform AI assistant that connects LLMs to chat apps like Telegram, Slack, and QQ, extensible with Python plugins.