Specify lower bound for required backport packages

diff --git a/psycopg/setup.cfg b/psycopg/setup.cfg
index 45f05f48d61b33b9f73274f86be4c7cd1b99ddfe..81e157d2290ab169934571b47a251b20e0e322c9 100644 (file)
--- a/psycopg/setup.cfg
+++ b/psycopg/setup.cfg
@@ -39,9 +39,9 @@ python_requires = >= 3.6
 packages = find:
 zip_safe = False
 install_requires =
-    backports.zoneinfo; python_version < "3.9"
-    dataclasses; python_version < "3.7"
-    typing_extensions; python_version < "3.8"
+    backports.zoneinfo >= 0.2.0; python_version < "3.9"
+    dataclasses >= 0.8; python_version < "3.7"
+    typing_extensions >= 3.10; python_version < "3.8"
 
 [options.package_data]
 psycopg = py.typed