diff --git a/x-pack/plugins/fleet/server/services/package_policy.test.ts b/x-pack/plugins/fleet/server/services/package_policy.test.ts
index 08a2ef507fe20f..fa86c4b0b9e2d8 100644
--- a/x-pack/plugins/fleet/server/services/package_policy.test.ts
+++ b/x-pack/plugins/fleet/server/services/package_policy.test.ts
@@ -5269,14 +5269,14 @@ describe('getUpgradeDryRunDiff', () => {
     ]);
   });
 
-  it('should omit spaceId when upgrading package policies with spaceId', async () => {
+  it('should omit spaceIds when upgrading package policies with spaceIds', async () => {
     savedObjectsClient.get.mockImplementation((type, id) =>
       Promise.resolve({
         id,
         type: 'abcd',
         references: [],
         version: '0.9.0',
-        attributes: { ...createPackagePolicyMock(), name: id, spaceId: 'test' },
+        attributes: { ...createPackagePolicyMock(), name: id, spaceIds: ['test'] },
       })
     );
     const elasticsearchClient = elasticsearchServiceMock.createClusterClient().asInternalUser;
@@ -5296,7 +5296,7 @@ describe('getUpgradeDryRunDiff', () => {
       'ingest-package-policies',
       'package-policy-id-test-spaceId',
       expect.not.objectContaining({
-        spaceId: expect.anything(),
+        spaceIds: expect.anything(),
       }),
       expect.anything()
     );
diff --git a/x-pack/plugins/fleet/server/services/package_policy.ts b/x-pack/plugins/fleet/server/services/package_policy.ts
index d64c48ba7143b1..a53334c893fecb 100644
--- a/x-pack/plugins/fleet/server/services/package_policy.ts
+++ b/x-pack/plugins/fleet/server/services/package_policy.ts
@@ -1603,7 +1603,7 @@ class PackagePolicyClientImpl implements PackagePolicyClient {
   ) {
     const updatePackagePolicy = updatePackageInputs(
       {
-        ...omit(packagePolicy, 'id', 'spaceId'),
+        ...omit(packagePolicy, 'id', 'spaceIds'),
         inputs: packagePolicy.inputs,
         package: {
           ...packagePolicy.package!,
@@ -1688,7 +1688,7 @@ class PackagePolicyClientImpl implements PackagePolicyClient {
   ): Promise<UpgradePackagePolicyDryRunResponseItem> {
     const updatedPackagePolicy = updatePackageInputs(
       {
-        ...omit(packagePolicy, 'id', 'spaceId'),
+        ...omit(packagePolicy, 'id', 'spaceIds'),
         inputs: packagePolicy.inputs,
         package: {
           ...packagePolicy.package!,
@@ -1944,7 +1944,7 @@ class PackagePolicyClientImpl implements PackagePolicyClient {
                 const omitted = {
                   ...omit(result, [
                     'id',
-                    'spaceId',
+                    'spaceIds',
                     'version',
                     'revision',
                     'updated_at',