Hi All,

I get the following error when I upload my oTree zip file on oTree Hub. My Python Interpreter is 3.12 and the numpy package I installed is the latest version 2.3.0. I updated my requirements.txt file to indicate this numpy version and now I get the following build failed result. Does anyone have any suggestion or solution for this?

Failed
Time
25 seconds ago

Build output
-----> Building on the Heroku-24 stack
-----> Using buildpack: heroku/python
-----> Python app detected
-----> Using Python 3.9.16 specified in runtime.txt

 !     Warning: The runtime.txt file is deprecated.
 !     
 !     The runtime.txt file is deprecated since it has been replaced
 !     by the more widely supported .python-version file:
 !     https://devcenter.heroku.com/changelog-items/3141
 !     
 !     Please switch to using a .python-version file instead.
 !     
 !     Delete your runtime.txt file and create a new file in the
 !     root directory of your app named:
 !     .python-version
 !     
 !     Make sure to include the '.' character at the start of the
 !     filename. Don't add a file extension such as '.txt'.
 !     
 !     In the new file, specify your app's major Python version number
 !     only. Don't include quotes or a 'python-' prefix.
 !     
 !     For example, to request the latest version of Python 3.9,
 !     update your .python-version file so it contains exactly:
 !     3.9
 !     
 !     We strongly recommend that you don't specify the Python patch
 !     version number, since it will pin your app to an exact Python
 !     version and so stop your app from receiving security updates
 !     each time it builds.
 !     
 !     In the future support for runtime.txt will be removed and
 !     this warning will be made an error.


 !     Warning: Support for Python 3.9 is ending soon!
 !     
 !     Python 3.9 will reach its upstream end-of-life in October 2025,
 !     at which point it will no longer receive security updates:
 !     https://devguide.python.org/versions/#supported-versions
 !     
 !     As such, support for Python 3.9 will be removed from this
 !     buildpack on 7th January 2026.
 !     
 !     Upgrade to a newer Python version as soon as possible, by
 !     changing the version in your runtime.txt file.
 !     
 !     For more information, see:
 !     https://devcenter.heroku.com/articles/python-support#supported-python-versions


 !     Warning: A Python patch update is available!
 !     
 !     Your app is using Python 3.9.16, however, there is a newer
 !     patch release of Python 3.9 available: 3.9.23
 !     
 !     It is important to always use the latest patch version of
 !     Python to keep your app secure.
 !     
 !     Update your runtime.txt file to use the new version.
 !     
 !     We strongly recommend that you don't pin your app to an
 !     exact Python version such as 3.9.16, and instead only specify
 !     the major Python version of 3.9 in your runtime.txt file.
 !     This will allow your app to receive the latest available Python
 !     patch version automatically and prevent this warning.

-----> Discarding cache since:
       - The contents of requirements.txt changed
-----> Installing Python 3.9.16
-----> Installing pip 25.1.1, setuptools 70.3.0 and wheel 0.45.1
-----> Installing SQLite3
-----> Installing dependencies using 'pip install -r requirements.txt'
       Collecting otree==5.10.3 (from -r requirements.txt (line 2))
         Downloading otree-5.10.3.tar.gz (451 kB)
         Preparing metadata (setup.py): started
         Preparing metadata (setup.py): finished with status 'done'
       Collecting psycopg2>=2.8.4 (from -r requirements.txt (line 3))
         Downloading psycopg2-2.9.10.tar.gz (385 kB)
         Preparing metadata (setup.py): started
         Preparing metadata (setup.py): finished with status 'done'
       Collecting sentry-sdk>=0.7.9 (from -r requirements.txt (line 4))
         Downloading sentry_sdk-2.29.1-py2.py3-none-any.whl.metadata (10 kB)
       ERROR: Ignored the following versions that require a different python version: 2.1.0 Requires-Python >=3.10; 2.1.0rc1 Requires-Python >=3.10; 2.1.1 Requires-Python >=3.10; 2.1.2 Requires-Python >=3.10; 2.1.3 Requires-Python >=3.10; 2.2.0 Requires-Python >=3.10; 2.2.0rc1 Requires-Python >=3.10; 2.2.1 Requires-Python >=3.10; 2.2.2 Requires-Python >=3.10; 2.2.3 Requires-Python >=3.10; 2.2.4 Requires-Python >=3.10; 2.2.5 Requires-Python >=3.10; 2.2.6 Requires-Python >=3.10; 2.3.0 Requires-Python >=3.11; 2.3.0rc1 Requires-Python >=3.11
       ERROR: Could not find a version that satisfies the requirement numpy==2.3.0 (from versions: 1.3.0, 1.4.1, 1.5.0, 1.5.1, 1.6.0, 1.6.1, 1.6.2, 1.7.0, 1.7.1, 1.7.2, 1.8.0, 1.8.1, 1.8.2, 1.9.0, 1.9.1, 1.9.2, 1.9.3, 1.10.0.post2, 1.10.1, 1.10.2, 1.10.4, 1.11.0, 1.11.1, 1.11.2, 1.11.3, 1.12.0, 1.12.1, 1.13.0, 1.13.1, 1.13.3, 1.14.0, 1.14.1, 1.14.2, 1.14.3, 1.14.4, 1.14.5, 1.14.6, 1.15.0, 1.15.1, 1.15.2, 1.15.3, 1.15.4, 1.16.0, 1.16.1, 1.16.2, 1.16.3, 1.16.4, 1.16.5, 1.16.6, 1.17.0, 1.17.1, 1.17.2, 1.17.3, 1.17.4, 1.17.5, 1.18.0, 1.18.1, 1.18.2, 1.18.3, 1.18.4, 1.18.5, 1.19.0, 1.19.1, 1.19.2, 1.19.3, 1.19.4, 1.19.5, 1.20.0, 1.20.1, 1.20.2, 1.20.3, 1.21.0, 1.21.1, 1.21.2, 1.21.3, 1.21.4, 1.21.5, 1.21.6, 1.22.0, 1.22.1, 1.22.2, 1.22.3, 1.22.4, 1.23.0, 1.23.1, 1.23.2, 1.23.3, 1.23.4, 1.23.5, 1.24.0, 1.24.1, 1.24.2, 1.24.3, 1.24.4, 1.25.0, 1.25.1, 1.25.2, 1.26.0, 1.26.1, 1.26.2, 1.26.3, 1.26.4, 2.0.0, 2.0.1, 2.0.2)
       ERROR: No matching distribution found for numpy==2.3.0

 !     Error: Unable to install dependencies using pip.
 !     
 !     See the log output above for more information.

 !     Push rejected, failed to compile Python app.

 !     Push failed

In case anyone's facing this problem as well due to upgrading to Heroku-24 stack, I reinstalled otree and then uploaded it on oTree Hub. The build was successful then.