diff --git a/signal-server-openapi.yaml b/signal-server-openapi.yaml
index 164f99a35..b6d3dcfe0 100644
--- a/signal-server-openapi.yaml
+++ b/signal-server-openapi.yaml
@@ -1237,6 +1237,7 @@ paths:
             application/json:
               schema:
                 $ref: '#/components/schemas/AttachmentDescriptorV2'
+      deprecated: true
       security:
       - authenticatedAccount: []
   /v3/attachments/form/upload:
@@ -1251,6 +1252,7 @@ paths:
             application/json:
               schema:
                 $ref: '#/components/schemas/AttachmentDescriptorV3'
+      deprecated: true
       security:
       - authenticatedAccount: []
   /v4/attachments/form/upload: