diff --git a/packages/schemas/src/schemas/manifest.schema.json b/packages/schemas/src/schemas/manifest.schema.json
index ce6506398..5b06fe1ac 100644
--- a/packages/schemas/src/schemas/manifest.schema.json
+++ b/packages/schemas/src/schemas/manifest.schema.json
@@ -43,55 +43,19 @@
       "errorMessage": "should be a semantic version in the format x.y.z"
     },
     "upstreamRepo": {
-      "oneOf": [
-        {
-          "type": "string",
-          "description": "For DAppNode Packages that only wrap existing software (i.e. Bitcoin node, Ethereum node), the upstream software repository can be specified here.",
-          "examples": ["ethereum/go-ethereum", "NethermindEth/nethermind"]
-        },
-        {
-          "type": "array",
-          "description": "For DAppNode Packages that only wrap existing software (i.e. Bitcoin node, Ethereum node), several upstream software repositories can be specified here.",
-          "items": {
-            "type": "string",
-            "examples": ["ethereum/go-ethereum", "NethermindEth/nethermind"]
-          }
-        }
-      ]
+      "type": "string",
+      "description": "For DAppNode Packages that only wrap existing software (i.e. Bitcoin node, Ethereum node), the upstream software repository can be specified here.",
+      "examples": ["ethereum/go-ethereum", "NethermindEth/nethermind"]
     },
     "upstreamVersion": {
-      "oneOf": [
-        {
-          "type": "string",
-          "description": "For DAppNode Packages that only wrap existing software (i.e. Bitcoin node, Ethereum node), the underlying software version can be specified here. It will be shown in the admin UI alongside the field `version`.",
-          "examples": ["2.6.0", "v1.2.1"]
-        },
-        {
-          "type": "array",
-          "description": "For DAppNode Packages that only wrap existing software (i.e. Bitcoin node, Ethereum node) from several repositories, the underlying software version can be specified here. It will be shown in the admin UI alongside the field `version`.",
-          "items": {
-            "type": "string",
-            "examples": ["2.6.0", "v1.2.1"]
-          }
-        }
-      ]
+      "type": "string",
+      "description": "For DAppNode Packages that only wrap existing software (i.e. Bitcoin node, Ethereum node), the underlying software version can be specified here. It will be shown in the admin UI alongside the field `version`.",
+      "examples": ["2.6.0", "v1.2.1"]
     },
     "upstreamArg": {
-      "oneOf": [
-        {
-          "type": "string",
-          "description": "For DAppNode Packages that only wrap existing software (i.e. Bitcoin node, Ethereum node), the env var name to handle the upstream software version can be specified here.",
-          "examples": ["UPSTREAM_VERSION", "UPSTREAM_ARG"]
-        },
-        {
-          "type": "array",
-          "description": "For DAppNode Packages that only wrap existing software (i.e. Bitcoin node, Ethereum node) from several repositories, the env var names to handle the upstream software versions can be specified here.",
-          "items": {
-            "type": "string",
-            "examples": ["UPSTREAM_VERSION", "UPSTREAM_ARG"]
-          }
-        }
-      ]
+      "type": "string",
+      "description": "For DAppNode Packages that only wrap existing software (i.e. Bitcoin node, Ethereum node), the env var name to handle the upstream software version can be specified here.",
+      "examples": ["UPSTREAM_VERSION", "UPSTREAM_ARG"]
     },
     "upstream": {
       "type": "array",
diff --git a/packages/schemas/test/unit/validateSchema.test.ts b/packages/schemas/test/unit/validateSchema.test.ts
index d0faa7136..4cd011543 100644
--- a/packages/schemas/test/unit/validateSchema.test.ts
+++ b/packages/schemas/test/unit/validateSchema.test.ts
@@ -365,7 +365,8 @@ volumes:
       expect(() => validateManifestSchema(manifest)).to.not.throw();
     });
 
-    it("should allow a manifest with the upstream settings defined as separate arrays", () => {
+    it("should not allow a manifest with the upstream settings defined as separate arrays", () => {
+      // This way of defining the upstream settings has been deprecated
       const manifest: Manifest = {
         name: "example.dnp.dappnode.eth",
         version: "1.0.0",
@@ -377,7 +378,7 @@ volumes:
         upstreamArg: ["GETH_VERSION", "NETHERMIND_VERSION"]
       };
 
-      expect(() => validateManifestSchema(manifest)).to.not.throw();
+      expect(() => validateManifestSchema(manifest)).to.throw();
     });
 
     it("should not allow a manifest with upstream settings defined in both possible ways", () => {
diff --git a/packages/types/src/manifest.ts b/packages/types/src/manifest.ts
index 820363cce..ceba96219 100644
--- a/packages/types/src/manifest.ts
+++ b/packages/types/src/manifest.ts
@@ -9,9 +9,9 @@ export interface Manifest {
   // Package metadata
   name: string;
   version: string;
-  upstreamVersion?: string | string[];
-  upstreamRepo?: string | string[];
-  upstreamArg?: string | string[];
+  upstreamVersion?: string;
+  upstreamRepo?: string;
+  upstreamArg?: string;
   upstream?: {
     repo: string;
     version: string;