diff --git a/stubs/pyRFC3339/METADATA.toml b/stubs/pyRFC3339/METADATA.toml
index 223bbf392a5b..5fa43bd49a91 100644
--- a/stubs/pyRFC3339/METADATA.toml
+++ b/stubs/pyRFC3339/METADATA.toml
@@ -1,2 +1,3 @@
 version = "~=2.0.1"
 upstream_repository = "https://github.com/kurtraschke/pyRFC3339"
+obsolete_since = "2.1.0" # Released on 2025-08-23