diff --git a/payment_sixpay/indico_sixpay/__about__.py b/payment_sixpay/indico_sixpay/__about__.py
index f45b463..20f0d33 100644
--- a/payment_sixpay/indico_sixpay/__about__.py
+++ b/payment_sixpay/indico_sixpay/__about__.py
@@ -48,7 +48,7 @@ __title__ = 'indico_sixpay'
 __summary__ = 'Indico EPayment Plugin for SixPay services'
 __url__ = 'https://github.com/maxfischer2781/indico_sixpay'
 
-__version__ = '2.0.2'
+__version__ = '3.0-dev'
 __author__ = 'Max Fischer'
 __email__ = 'maxfischer2781@gmail.com'
 __copyright__ = '2017 - 2018 %s' % __author__
diff --git a/payment_sixpay/setup.py b/payment_sixpay/setup.py
index fc9e88a..2c80685 100644
--- a/payment_sixpay/setup.py
+++ b/payment_sixpay/setup.py
@@ -22,7 +22,8 @@ setup(
     },
     packages=find_packages(),
     package_data={'indico_sixpay': ['templates/*.html']},
-    install_requires=['requests', 'indico>=2.0', 'iso4217'],
+    install_requires=['requests', 'indico>=3.0', 'iso4217'],
+    python_requires='~=3.9.0',
     license='GPLv3+',
     classifiers=[
         'Development Status :: 5 - Production/Stable',