diff --git a/x-pack/platform/plugins/shared/fleet/common/types/models/epm.ts b/x-pack/platform/plugins/shared/fleet/common/types/models/epm.ts
index 662b12494cbbc..f4b997f80a82f 100644
--- a/x-pack/platform/plugins/shared/fleet/common/types/models/epm.ts
+++ b/x-pack/platform/plugins/shared/fleet/common/types/models/epm.ts
@@ -7,6 +7,8 @@
 
 import type { estypes } from '@elastic/elasticsearch';
 
+import type { IngestPipeline } from '@elastic/elasticsearch/lib/api/types';
+
 import type {
   ASSETS_SAVED_OBJECT_TYPE,
   agentAssetTypes,
@@ -799,6 +801,15 @@ export interface IndexTemplate {
   modified_date_millis?: number;
 }
 
+export interface IngestPipelineWithDateFields extends IngestPipeline {
+  // These properties are returned on ES read operations and
+  // not allowed to be set on ES write operations
+  created_date?: number;
+  created_date_millis?: number;
+  modified_date?: number;
+  modified_date_millis?: number;
+}
+
 export interface ESAssetMetadata {
   package?: {
     name: string;
diff --git a/x-pack/platform/plugins/shared/fleet/server/tasks/sync_integrations/custom_assets.test.ts b/x-pack/platform/plugins/shared/fleet/server/tasks/sync_integrations/custom_assets.test.ts
index f4272b6343d1d..2be51b46f7e89 100644
--- a/x-pack/platform/plugins/shared/fleet/server/tasks/sync_integrations/custom_assets.test.ts
+++ b/x-pack/platform/plugins/shared/fleet/server/tasks/sync_integrations/custom_assets.test.ts
@@ -702,6 +702,11 @@ describe('custom assets', () => {
               },
             ],
             version: 1,
+            description: 'description pipeline',
+            created_date: '2024-01-01T12:00:00.000Z',
+            created_date_millis: 1704110400000,
+            modified_date: '2025-01-01T12:00:00.000Z',
+            modified_date_millis: 1735732800000,
           },
           type: 'ingest_pipeline',
         },
@@ -721,6 +726,7 @@ describe('custom assets', () => {
             },
           ],
           version: 1,
+          description: 'description pipeline',
         },
         expect.anything()
       );
diff --git a/x-pack/platform/plugins/shared/fleet/server/tasks/sync_integrations/custom_assets.ts b/x-pack/platform/plugins/shared/fleet/server/tasks/sync_integrations/custom_assets.ts
index d1bc71da6bb86..2d0e0086212e0 100644
--- a/x-pack/platform/plugins/shared/fleet/server/tasks/sync_integrations/custom_assets.ts
+++ b/x-pack/platform/plugins/shared/fleet/server/tasks/sync_integrations/custom_assets.ts
@@ -18,6 +18,8 @@ import { retryTransientEsErrors } from '../../services/epm/elasticsearch/retry';
 import { packagePolicyService } from '../../services';
 import { SO_SEARCH_LIMIT } from '../../constants';
 
+import type { IngestPipelineWithDateFields } from '../../../common/types';
+
 import type { CustomAssetsData, IntegrationsData, SyncIntegrationsData } from './model';
 
 const DELETED_ASSET_TTL = 7 * 24 * 60 * 60 * 1000; // 7 days
@@ -297,12 +299,21 @@ async function updateIngestPipeline(
 
   if (shouldUpdatePipeline) {
     logger.debug(`Updating ingest pipeline: ${customAsset.name}`);
+
+    // Remove system-managed properties (dates) that cannot be set during create/update of ingest pipelines
+    const {
+      created_date: createdDate,
+      created_date_millis: createdDateMillis,
+      modified_date: modifiedDate,
+      modified_date_millis: modifiedDateMillis,
+      ...updatedIngestPipeline
+    } = customAsset.pipeline as IngestPipelineWithDateFields;
     return retryTransientEsErrors(
       () =>
         esClient.ingest.putPipeline(
           {
             id: customAsset.name,
-            ...customAsset.pipeline,
+            ...updatedIngestPipeline,
           },
           {
             signal: abortController.signal,