diff --git a/check_eol-data/os.cfg b/check_eol-data/os.cfg
index 2994be2181368705228f1cd17f944a0398f87f0f..9b227d0cc7d516046f09398d7770f37779086dab 100644
--- a/check_eol-data/os.cfg
+++ b/check_eol-data/os.cfg
@@ -47,6 +47,7 @@ debian:8:2020-06-06:LTS
 debian:9:2022-06-22:LTS
 debian:10:2024-06-30:LTS starts July 2022
 debian:11:2026-06-30:LTS starts July 2024
+debian:12:2028-06-30:(not defined yet - check https://wiki.debian.org/LTS)