diff --git a/oonipipeline/src/oonipipeline/temporal/activities/observations.py b/oonipipeline/src/oonipipeline/temporal/activities/observations.py
index 4bc63549..8660db15 100644
--- a/oonipipeline/src/oonipipeline/temporal/activities/observations.py
+++ b/oonipipeline/src/oonipipeline/temporal/activities/observations.py
@@ -130,27 +130,26 @@ async def make_observations_for_file_entry_batch(
     ccs = ccs_set(probe_cc)
     total_measurement_count = 0
     awaitables = []
-    with concurrent.futures.ProcessPoolExecutor() as pool:
-        for bucket_name, s3path, ext, fe_size in file_entry_batch:
-            failure_count = 0
-            log.debug(f"processing file s3://{bucket_name}/{s3path}")
-            awaitables.append(
-                loop.run_in_executor(
-                    pool,
-                    functools.partial(
-                        make_observations_for_file_entry,
-                        clickhouse=clickhouse,
-                        data_dir=data_dir,
-                        bucket_date=bucket_date,
-                        bucket_name=bucket_name,
-                        s3path=s3path,
-                        ext=ext,
-                        fast_fail=fast_fail,
-                        write_batch_size=write_batch_size,
-                        ccs=ccs,
-                    ),
-                )
+    for bucket_name, s3path, ext, fe_size in file_entry_batch:
+        failure_count = 0
+        log.debug(f"processing file s3://{bucket_name}/{s3path}")
+        awaitables.append(
+            loop.run_in_executor(
+                None,
+                functools.partial(
+                    make_observations_for_file_entry,
+                    clickhouse=clickhouse,
+                    data_dir=data_dir,
+                    bucket_date=bucket_date,
+                    bucket_name=bucket_name,
+                    s3path=s3path,
+                    ext=ext,
+                    fast_fail=fast_fail,
+                    write_batch_size=write_batch_size,
+                    ccs=ccs,
+                ),
             )
+        )
 
     results = await asyncio.gather(*awaitables)
     for measurement_count, failure_count in results:
diff --git a/oonipipeline/src/oonipipeline/temporal/workers.py b/oonipipeline/src/oonipipeline/temporal/workers.py
index a74cd952..814c1cd0 100644
--- a/oonipipeline/src/oonipipeline/temporal/workers.py
+++ b/oonipipeline/src/oonipipeline/temporal/workers.py
@@ -28,7 +28,7 @@
 
 log = logging.getLogger("oonipipeline.workers")
 
-from concurrent.futures import ThreadPoolExecutor
+from concurrent.futures import ThreadPoolExecutor, ProcessPoolExecutor, Executor
 
 interrupt_event = asyncio.Event()
 
@@ -51,7 +51,7 @@
 
 
 async def worker_main(
-    temporal_config: TemporalConfig, max_workers: int, thread_pool: ThreadPoolExecutor
+    temporal_config: TemporalConfig, max_workers: int, executor: Executor
 ):
     client = await temporal_connect(temporal_config=temporal_config)
     async with Worker(
@@ -59,7 +59,7 @@ async def worker_main(
         task_queue=TASK_QUEUE_NAME,
         workflows=WORKFLOWS,
         activities=ACTIVTIES,
-        activity_executor=thread_pool,
+        activity_executor=executor,
         max_concurrent_activities=max_workers,
         max_concurrent_workflow_tasks=max_workers,
     ):
@@ -71,9 +71,10 @@ async def worker_main(
 def start_workers(temporal_config: TemporalConfig):
     max_workers = max(os.cpu_count() or 4, 4)
     log.info(f"starting workers with max_workers={max_workers}")
-    thread_pool = ThreadPoolExecutor(max_workers=max_workers + 2)
+    executor = ProcessPoolExecutor(max_workers=max_workers + 2)
+
     loop = asyncio.new_event_loop()
-    loop.set_default_executor(thread_pool)
+    loop.set_default_executor(executor)
     # TODO(art): Investigate if we want to upgrade to python 3.12 and use this
     # instead
     # loop.set_task_factory(asyncio.eager_task_factory)
@@ -82,11 +83,11 @@ def start_workers(temporal_config: TemporalConfig):
             worker_main(
                 temporal_config=temporal_config,
                 max_workers=max_workers,
-                thread_pool=thread_pool,
+                executor=executor,
             )
         )
     except KeyboardInterrupt:
         interrupt_event.set()
         loop.run_until_complete(loop.shutdown_asyncgens())
-        thread_pool.shutdown(wait=True, cancel_futures=True)
+        executor.shutdown(wait=True, cancel_futures=True)
         log.info("shut down thread pool")