diff --git a/src/modules/pipelinesV2/pipelines-client.ts b/src/modules/pipelinesV2/pipelines-client.ts
index 53c0442..6330104 100644
--- a/src/modules/pipelinesV2/pipelines-client.ts
+++ b/src/modules/pipelinesV2/pipelines-client.ts
@@ -25,6 +25,10 @@ export class PipelinesClientConfiguration {
       loader: {
         keepCase: true,
         enums: String,
+        // int64 fields (PipelineV2SinkTableOffset.committed_offset) decode as
+        // plain JS numbers instead of Long.js objects, so they serialize as
+        // JSON numbers for the frontend. Safe: Kafka offsets fit in 2^53.
+        longs: Number,
         objects: true,
         arrays: true,
       },