diff --git a/_meta/setup.py b/_meta/setup.py
index 211187e..30eb4f7 100644
--- a/_meta/setup.py
+++ b/_meta/setup.py
@@ -29,19 +29,20 @@ extras_require = {}
 
 setup(
     name='indico-plugins',
-    version='2.3',
+    version='3.0-dev',
     description='A meta-package containing the official Indico plugins',
     url='https://github.com/indico/indico-plugins',
     license='MIT',
     author='Indico Team',
     author_email='indico-team@cern.ch',
     zip_safe=False,
-    install_requires=['indico>=2.3.dev0'] + plugins_require,
+    install_requires=['indico>=3.0.dev0', *plugins_require],
+    python_requires='~=3.9',
     extras_require=extras_require,
     classifiers=[
         'Environment :: Plugins',
         'Environment :: Web Environment',
         'License :: OSI Approved :: MIT License',
-        'Programming Language :: Python :: 2.7',
+        'Programming Language :: Python :: 3.9',
     ]
 )
diff --git a/livesync/setup.py b/livesync/setup.py
index 8eee8dd..ac7dde3 100644
--- a/livesync/setup.py
+++ b/livesync/setup.py
@@ -12,7 +12,7 @@ from setuptools import find_packages, setup
 
 setup(
     name='indico-plugin-livesync',
-    version='2.3',
+    version='3.0-dev',
     description='Framework for pushing Indico event data to external services',
     url='https://github.com/indico/indico-plugins',
     license='MIT',
@@ -21,14 +21,13 @@ setup(
     packages=find_packages(),
     zip_safe=False,
     include_package_data=True,
-    install_requires=[
-        'indico>=2.3.dev0'
-    ],
+    install_requires=['indico>=3.0.dev0'],
+    python_requires='~=3.9',
     classifiers=[
         'Environment :: Plugins',
         'Environment :: Web Environment',
         'License :: OSI Approved :: MIT License',
-        'Programming Language :: Python :: 2.7'
+        'Programming Language :: Python :: 3.9'
     ],
     entry_points={'indico.plugins': {'livesync = indico_livesync.plugin:LiveSyncPlugin'}}
 )
diff --git a/livesync_debug/setup.py b/livesync_debug/setup.py
index d3b8020..13766f0 100644
--- a/livesync_debug/setup.py
+++ b/livesync_debug/setup.py
@@ -12,7 +12,7 @@ from setuptools import find_packages, setup
 
 setup(
     name='indico-plugin-livesync-debug',
-    version='1.0',
+    version='3.0-dev',
     description='Debug target for the Indico LiveSync plugin',
     url='https://github.com/indico/indico-plugins',
     license='MIT',
@@ -22,14 +22,15 @@ setup(
     zip_safe=False,
     include_package_data=True,
     install_requires=[
-        'indico>=2.0',
-        'indico-plugin-livesync>=1.0'
+        'indico>=3.0.dev0',
+        'indico-plugin-livesync>=3.0.dev0',
     ],
+    python_requires='~=3.9',
     classifiers=[
         'Environment :: Plugins',
         'Environment :: Web Environment',
         'License :: OSI Approved :: MIT License',
-        'Programming Language :: Python :: 2.7'
+        'Programming Language :: Python :: 3.9'
     ],
     entry_points={'indico.plugins': {'livesync_debug = indico_livesync_debug.plugin:LiveSyncDebugPlugin'}}
 )
diff --git a/payment_manual/setup.py b/payment_manual/setup.py
index f6a8ef3..5169d97 100644
--- a/payment_manual/setup.py
+++ b/payment_manual/setup.py
@@ -12,7 +12,7 @@ from setuptools import find_packages, setup
 
 setup(
     name='indico-plugin-payment-manual',
-    version='1.0.1',
+    version='3.0-dev',
     description='Payment plugin for Indico that can be used for custom payment information/links',
     url='https://github.com/indico/indico-plugins',
     license='MIT',
@@ -21,14 +21,13 @@ setup(
     packages=find_packages(),
     zip_safe=False,
     include_package_data=True,
-    install_requires=[
-        'indico>=2.0'
-    ],
+    install_requires=['indico>=3.0.dev0'],
+    python_requires='~=3.9',
     classifiers=[
         'Environment :: Plugins',
         'Environment :: Web Environment',
         'License :: OSI Approved :: MIT License',
-        'Programming Language :: Python :: 2.7'
+        'Programming Language :: Python :: 3.9'
     ],
     entry_points={'indico.plugins': {'payment_manual = indico_payment_manual.plugin:ManualPaymentPlugin'}}
 )
diff --git a/payment_paypal/setup.py b/payment_paypal/setup.py
index 21222b6..9e5a118 100644
--- a/payment_paypal/setup.py
+++ b/payment_paypal/setup.py
@@ -12,7 +12,7 @@ from setuptools import find_packages, setup
 
 setup(
     name='indico-plugin-payment-paypal',
-    version='2.2',
+    version='3.0-dev',
     description='PayPal payments for Indico event registration fees',
     url='https://github.com/indico/indico-plugins',
     license='MIT',
@@ -21,14 +21,13 @@ setup(
     packages=find_packages(),
     zip_safe=False,
     include_package_data=True,
-    install_requires=[
-        'indico>=2.2.dev0'
-    ],
+    install_requires=['indico>=3.0.dev0'],
+    python_requires='~=3.9',
     classifiers=[
         'Environment :: Plugins',
         'Environment :: Web Environment',
         'License :: OSI Approved :: MIT License',
-        'Programming Language :: Python :: 2.7'
+        'Programming Language :: Python :: 3.9'
     ],
     entry_points={'indico.plugins': {'payment_paypal = indico_payment_paypal.plugin:PaypalPaymentPlugin'}}
 )
diff --git a/piwik/setup.py b/piwik/setup.py
index 8c37e08..0391172 100644
--- a/piwik/setup.py
+++ b/piwik/setup.py
@@ -12,7 +12,7 @@ from setuptools import find_packages, setup
 
 setup(
     name='indico-plugin-piwik',
-    version='2.3',
+    version='3.0-dev',
     description='Piwik integration for global and event-specific statistics in Indico',
     url='https://github.com/indico/indico-plugins',
     license='MIT',
@@ -21,14 +21,13 @@ setup(
     packages=find_packages(),
     zip_safe=False,
     include_package_data=True,
-    install_requires=[
-        'indico>=2.3.dev0'
-    ],
+    install_requires=['indico>=3.0.dev0'],
+    python_requires='~=3.9',
     classifiers=[
         'Environment :: Plugins',
         'Environment :: Web Environment',
         'License :: OSI Approved :: MIT License',
-        'Programming Language :: Python :: 2.7'
+        'Programming Language :: Python :: 3.9'
     ],
     entry_points={'indico.plugins': {'piwik = indico_piwik.plugin:PiwikPlugin'}}
 )
diff --git a/previewer_code/setup.py b/previewer_code/setup.py
index 3dbdccb..286483f 100644
--- a/previewer_code/setup.py
+++ b/previewer_code/setup.py
@@ -12,7 +12,7 @@ from setuptools import find_packages, setup
 
 setup(
     name='indico-plugin-previewer-code',
-    version='1.0',
+    version='3.0-dev',
     description='Syntax highlighter for code attachments in Indico',
     url='https://github.com/indico/indico-plugins',
     license='MIT',
@@ -22,8 +22,9 @@ setup(
     zip_safe=False,
     include_package_data=True,
     install_requires=[
-        'indico>=2.0',
-        'pygments'
+        'indico>=3.0.dev0',
+        'pygments',
     ],
+    python_requires='~=3.9',
     entry_points={'indico.plugins': {'previewer_code = indico_previewer_code:CodePreviewerPlugin'}}
 )
diff --git a/previewer_jupyter/setup.py b/previewer_jupyter/setup.py
index 7be753d..f77c3a6 100644
--- a/previewer_jupyter/setup.py
+++ b/previewer_jupyter/setup.py
@@ -12,7 +12,7 @@ from setuptools import find_packages, setup
 
 setup(
     name='indico-plugin-previewer-jupyter',
-    version='1.0',
+    version='3.0-dev',
     description='Jupyter notebook rendering for attachments in Indico',
     url='https://github.com/indico/indico-plugins',
     license='MIT',
@@ -22,9 +22,9 @@ setup(
     zip_safe=False,
     include_package_data=True,
     install_requires=[
-        'indico>=2.0',
+        'indico>=3.0.dev0',
         'nbconvert>=4.0.0',
-        'functools32'
     ],
+    python_requires='~=3.9',
     entry_points={'indico.plugins': {'previewer_jupyter = indico_previewer_jupyter:JupyterPreviewerPlugin'}}
 )
diff --git a/storage_s3/setup.py b/storage_s3/setup.py
index c447318..c678fb5 100644
--- a/storage_s3/setup.py
+++ b/storage_s3/setup.py
@@ -12,7 +12,7 @@ from setuptools import find_packages, setup
 
 setup(
     name='indico-plugin-storage-s3',
-    version='2.3.2',
+    version='3.0-dev',
     description='S3 storage backend for Indico',
     url='https://github.com/indico/indico-plugins',
     license='MIT',
@@ -22,14 +22,15 @@ setup(
     zip_safe=False,
     platforms='any',
     install_requires=[
-        'indico>=2.3.dev0',
+        'indico>=3.0.dev0',
         'boto3>=1.14.30,<2.0',
     ],
+    python_requires='~=3.9',
     classifiers=[
         'Environment :: Plugins',
         'Environment :: Web Environment',
         'License :: OSI Approved :: MIT License',
-        'Programming Language :: Python :: 2.7'
+        'Programming Language :: Python :: 3.9'
     ],
     entry_points={'indico.plugins': {'storage_s3 = indico_storage_s3.plugin:S3StoragePlugin'}}
 )
diff --git a/ursh/setup.py b/ursh/setup.py
index 3c87dd1..3ed53b0 100644
--- a/ursh/setup.py
+++ b/ursh/setup.py
@@ -12,7 +12,7 @@ from setuptools import find_packages, setup
 
 setup(
     name='indico-plugin-ursh',
-    version='2.3',
+    version='3.0-dev',
     description='URL shortening service for Indico',
     url='https://github.com/indico/indico-plugins',
     license='MIT',
@@ -21,14 +21,13 @@ setup(
     packages=find_packages(),
     zip_safe=False,
     include_package_data=True,
-    install_requires=[
-        'indico>=2.3.dev0',
-    ],
+    install_requires=['indico>=3.0.dev0'],
+    python_requires='~=3.9',
     classifiers=[
         'Environment :: Plugins',
         'Environment :: Web Environment',
         'License :: OSI Approved :: GNU General Public License v3 or later (GPLv3+)',
-        'Programming Language :: Python :: 2.7'
+        'Programming Language :: Python :: 3.9'
     ],
     entry_points={'indico.plugins': {'ursh = indico_ursh.plugin:UrshPlugin'}}
 )
diff --git a/vc_dummy/setup.py b/vc_dummy/setup.py
index 3e512e5..ec36429 100644
--- a/vc_dummy/setup.py
+++ b/vc_dummy/setup.py
@@ -12,7 +12,7 @@ from setuptools import find_packages, setup
 
 setup(
     name='indico-plugin-vc-dummy',
-    version='1.0',
+    version='3.0-dev',
     description='Dummy/example video-conferencing plugin for Indico',
     url='https://github.com/indico/indico-plugins',
     license='MIT',
@@ -21,14 +21,13 @@ setup(
     packages=find_packages(),
     zip_safe=False,
     include_package_data=True,
-    install_requires=[
-        'indico>=2.0'
-    ],
+    install_requires=['indico>=3.0.dev0'],
+    python_requires='~=3.9',
     classifiers=[
         'Environment :: Plugins',
         'Environment :: Web Environment',
         'License :: OSI Approved :: MIT License',
-        'Programming Language :: Python :: 2.7'
+        'Programming Language :: Python :: 3.9'
     ],
     entry_points={'indico.plugins': {'vc_dummy = indico_vc_dummy.plugin:DummyPlugin'}}
 )
diff --git a/vc_vidyo/setup.py b/vc_vidyo/setup.py
index d42c728..15a5b1f 100644
--- a/vc_vidyo/setup.py
+++ b/vc_vidyo/setup.py
@@ -12,7 +12,7 @@ from setuptools import find_packages, setup
 
 setup(
     name='indico-plugin-vc-vidyo',
-    version='2.3.1',
+    version='3.0-dev',
     description='Vidyo video-conferencing plugin for Indico',
     url='https://github.com/indico/indico-plugins',
     license='MIT',
@@ -22,14 +22,15 @@ setup(
     zip_safe=False,
     include_package_data=True,
     install_requires=[
-        'indico>=2.3.2.dev0',
-        'zeep'
+        'indico>=3.0.dev0',
+        'zeep',
     ],
+    python_requires='~=3.9',
     classifiers=[
         'Environment :: Plugins',
         'Environment :: Web Environment',
         'License :: OSI Approved :: MIT License',
-        'Programming Language :: Python :: 2.7'
+        'Programming Language :: Python :: 3.9'
     ],
     entry_points={'indico.plugins': {'vc_vidyo = indico_vc_vidyo.plugin:VidyoPlugin'}}
 )