heroku change python version

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showing results for - "heroku change python version"
Buck
03 Jul 2017
1In runtime.txt add required version
2python-3.9.5
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4like this 
5https://github.com/heroku/python-getting-started/blob/main/runtime.txt
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7
8supported vestions are 
9python-3.9.5 
10python-3.8.10 
11python-3.7.10 
12python-3.6.13 
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