diff --git a/README.md b/README.md
index a4046dd..f3a4241 100644
--- a/README.md
+++ b/README.md
@@ -15,7 +15,7 @@
 - **Identifier:** [https://stac-extensions.github.io/mlm/v1.0.0/schema.json](https://stac-extensions.github.io/mlm/v1.0.0/schema.json)
 - **Field Name Prefix:** mlm
 - **Scope:** Collection, Item, Asset, Links
-- **Extension Maturity Classification:** Proposal
+- **Extension Maturity Classification:** Deprecated
 - **Owner:**
   - [@fmigneault](https://github.com/fmigneault)
   - [@rbavery](https://github.com/rbavery)