diff --git a/Developer's-Guide.md b/Developer's-Guide.md
index 87cbf8f..0eaf93f 100644
--- a/Developer's-Guide.md
+++ b/Developer's-Guide.md
@@ -15,7 +15,7 @@ The original UI was different, and the mission generation process was different
 
 ## Required tools
 
-* [Python 3.9+](https://www.python.org/downloads/)
+* [Python 3.10+](https://www.python.org/downloads/)
 * A code Editor for Python. I recommend [PyCharm Community Edition](https://www.jetbrains.com/pycharm/download/#section=windows), you can add plugin for Lua.
 
 When you install Python, make sure to install pip for dependencies management. This should come preinstalled.