diff --git a/{{cookiecutter.project_slug}}/runtime.txt b/{{cookiecutter.project_slug}}/runtime.txt
index febc1b8c..425359e6 100644
--- a/{{cookiecutter.project_slug}}/runtime.txt
+++ b/{{cookiecutter.project_slug}}/runtime.txt
@@ -1 +1 @@
-python-3.9.8
+python-3.9.9