diff --git a/setup.cfg b/setup.cfg
index 1293a91f..944154ec 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -31,7 +31,7 @@ project_urls =
     Source Code = https://github.com/borgbase/vorta
 
 [options]
-python_requires = >= 3.6
+python_requires = >=3.6, <3.10
 setup_requires =
   pip >= 10
   pytest-runner
@@ -42,10 +42,11 @@ install_requires =
   pyqt5
   peewee
   python-dateutil
-  apscheduler < 4.0
+  apscheduler<=3.8
   psutil
   setuptools
   secretstorage; sys_platform != 'darwin'
+  tzlocal==2.1
   pyobjc-core; sys_platform == 'darwin'
   pyobjc-framework-Cocoa; sys_platform == 'darwin'
   pyobjc-framework-LaunchServices; sys_platform == 'darwin'