diff --git a/{{cookiecutter.repo_name}}/runtime.txt b/{{cookiecutter.repo_name}}/runtime.txt
index e75f26b0..0c4eaa32 100644
--- a/{{cookiecutter.repo_name}}/runtime.txt
+++ b/{{cookiecutter.repo_name}}/runtime.txt
@@ -1,3 +1,3 @@
 {% if cookiecutter.use_python2= 'n' -%}
-FROM python:3.4
+python-3.4.3
 {% else %}