diff --git a/packages/apps-config/src/api/spec/altair.ts b/packages/apps-config/src/api/spec/altair.ts
new file mode 100644
index 0000000000..316280dfb1
--- /dev/null
+++ b/packages/apps-config/src/api/spec/altair.ts
@@ -0,0 +1,35 @@
+// Copyright 2017-2021 @polkadot/apps-config authors & contributors
+// SPDX-License-Identifier: Apache-2.0
+
+import type { OverrideBundleDefinition } from '@polkadot/types/types';
+
+/* eslint-disable sort-keys */
+
+const definitions: OverrideBundleDefinition = {
+  types: [
+    {
+      // on all versions
+      minmax: [0, undefined],
+      types: {
+        ParachainAccountIdOf: 'AccountId',
+        Proof: {
+          leafHash: 'Hash',
+          sortedHashes: 'Vec<Hash>'
+        },
+        ProxyType: {
+          _enum: [
+            'Any',
+            'NonTransfer',
+            'Governance',
+            '_Staking',
+            'NonProxy'
+          ]
+        },
+        RelayChainAccountId: 'AccountId',
+        RootHashOf: 'Hash'
+      }
+    }
+  ]
+};
+
+export default definitions;
diff --git a/packages/apps-config/src/api/spec/index.ts b/packages/apps-config/src/api/spec/index.ts
index 83030a9f03..e7d024a10b 100644
--- a/packages/apps-config/src/api/spec/index.ts
+++ b/packages/apps-config/src/api/spec/index.ts
@@ -4,6 +4,7 @@
 import type { OverrideBundleDefinition } from '@polkadot/types/types';
 
 import acala from './acala';
+import altair from './altair';
 import apron from './apron';
 import aresGladios from './ares-gladios';
 import aresParachain from './ares-parachain';
@@ -123,6 +124,7 @@ const spec: Record<string, OverrideBundleDefinition> = {
   VLN: vln,
   'VLN-PC': vlnrococo,
   ...acala,
+  altair,
   apron,
   'ares-gladios': aresGladios,
   'ares-parachain': aresParachain,