diff --git a/METADATA_SUPPORT.md b/METADATA_SUPPORT.md
index 697bdf9629..4bff980284 100644
--- a/METADATA_SUPPORT.md
+++ b/METADATA_SUPPORT.md
@@ -317,7 +317,7 @@ To contribute a new metadata type, please see the [Contributing Metadata Types t
 |MapsAndLocationSettings|✅||
 |MarketSegmentDefinition|❌|Not supported, but support could be added|
 |MarketingAppExtActivity|❌|Not supported, but support could be added|
-|MarketingAppExtension|❌|Not supported, but support could be added|
+|MarketingAppExtension|✅||
 |MatchingRules|✅||
 |MediaAdSalesSettings|✅||
 |MeetingsSettings|✅||
diff --git a/package.json b/package.json
index 4149acaee0..047e8bb77d 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@salesforce/source-deploy-retrieve",
-  "version": "6.3.0",
+  "version": "7.0.0",
   "description": "JavaScript library to run Salesforce metadata deploys and retrieves",
   "main": "lib/src/index.js",
   "author": "Salesforce",
@@ -123,4 +123,4 @@
       "path": "./node_modules/cz-conventional-changelog"
     }
   }
-}
+}
\ No newline at end of file
diff --git a/src/registry/metadataRegistry.json b/src/registry/metadataRegistry.json
index 2d49e78d6d..9dde0e22dd 100644
--- a/src/registry/metadataRegistry.json
+++ b/src/registry/metadataRegistry.json
@@ -1235,6 +1235,13 @@
       "directoryName": "marketingResourceType",
       "inFolder": false
     },
+    "marketingappextension": {
+      "id": "marketingappextension",
+      "name": "MarketingAppExtension",
+      "suffix": "marketingAppExtension",
+      "directoryName": "marketingAppExtensions",
+      "inFolder": false
+    },
     "sharingrules": {
       "id": "sharingrules",
       "name": "SharingRules",
@@ -3165,6 +3172,7 @@
     "channelLayout": "channellayout",
     "asset": "contentasset",
     "marketingResourceType": "marketingresourcetype",
+    "marketingAppExtension": "marketingappextension",
     "sharingRules": "sharingrules",
     "sharingSet": "sharingset",
     "community": "community",