diff --git a/requirements-test.txt b/requirements-test.txt
index 25d83d7..99bd2be 100644
--- a/requirements-test.txt
+++ b/requirements-test.txt
@@ -3,3 +3,8 @@ pytest-asyncio>=1.4.0
 pytest-cov>=7.1.0
 syrupy>=5.5.3
 aioresponses>=0.7.9
+# aioresponses 0.7.9 (latest release) predates aiohttp 3.14's new required
+# ClientResponse `stream_writer` kwarg -- fix is open upstream but unreleased:
+# https://github.com/pnuckowski/aioresponses/pull/288. Remove this cap once
+# a released aioresponses version picks it up.
+aiohttp<3.14