diff --git a/src/common/middleware/content-negotiation/supported-media-types.ts b/src/common/middleware/content-negotiation/supported-media-types.ts
index a1f53fa..dfb7215 100644
--- a/src/common/middleware/content-negotiation/supported-media-types.ts
+++ b/src/common/middleware/content-negotiation/supported-media-types.ts
@@ -1,12 +1,14 @@
 export enum SupportedMediaTypes {
-  "application" = "application",
+  Application = "application",
 }
 
 export enum SupportedMediaSubTypes {
-  "taxii+json" = "taxii+json",
+  TaxiiJson = "taxii+json",
 }
 
 export enum SupportedMediaVersion {
   V21 = "2.1",
   LATEST = "2.1",
 }
+
+export const DEFAULT_CONTENT_TYPE = `${SupportedMediaTypes.Application}/${SupportedMediaSubTypes.TaxiiJson};version=${SupportedMediaVersion.LATEST}` as const;
diff --git a/src/taxii/providers/discovery/discovery.service.ts b/src/taxii/providers/discovery/discovery.service.ts
index f530f52..c1da05d 100644
--- a/src/taxii/providers/discovery/discovery.service.ts
+++ b/src/taxii/providers/discovery/discovery.service.ts
@@ -1,6 +1,7 @@
 import { Injectable } from "@nestjs/common";
 import { TaxiiConfigService } from "src/config";
 import { DiscoverOptions, DiscoveryDto, ApiRootDto } from "./dto";
+import { DEFAULT_CONTENT_TYPE } from "src/common/middleware/content-negotiation/supported-media-types";
 
 @Injectable()
 export class DiscoveryService {
@@ -22,9 +23,9 @@ export class DiscoveryService {
     return new ApiRootDto({
       title: this.config.API_ROOT_TITLE,
       description: this.config.API_ROOT_DESCRIPTION,
-      version: "application/taxii+json;version=2.1", // ** A value of "application/taxii+json;version=2.1" MUST
-      // be included in this list to indicate conformance with
-      // this specification. ** //
+      versions: [
+        DEFAULT_CONTENT_TYPE, // ** A value of "application/taxii+json;version=2.1" MUST be included in this list to indicate conformance with this specification. ** //
+      ],
       maxContentLength: this.config.MAX_CONTENT_LENGTH,
     });
   }