diff --git a/tests/test_io_pool.py b/tests/test_io_pool.py
index dd06caf9..28b6b155 100644
--- a/tests/test_io_pool.py
+++ b/tests/test_io_pool.py
@@ -1,4 +1,4 @@
-"""Tests for src/io_pool.py (the shared 4-thread job pool on AppController).
+"""Tests for src/io_pool.py (the shared 8-thread job pool on AppController).
 
 Historical note: an earlier revision of this file added two regression
 tests asserting that ``make_io_pool`` registered an atexit shutdown
@@ -27,9 +27,9 @@ def test_make_io_pool_returns_thread_pool_executor() -> None:
  pool.shutdown(wait=False)
 
 
-def test_make_io_pool_has_four_workers() -> None:
+def test_make_io_pool_has_eight_workers() -> None:
  pool = make_io_pool()
- assert pool._max_workers == IO_POOL_MAX_WORKERS == 4
+ assert pool._max_workers == IO_POOL_MAX_WORKERS == 8
  pool.shutdown(wait=False)