diff --git a/packages/google-api-core/pyproject.toml b/packages/google-api-core/pyproject.toml
index fa40c6ea7695..19642422ac21 100644
--- a/packages/google-api-core/pyproject.toml
+++ b/packages/google-api-core/pyproject.toml
@@ -58,7 +58,7 @@ Documentation = "https://googleapis.dev/python/google-api-core/latest/"
 Repository = "https://github.com/googleapis/google-cloud-python"
 
 [project.optional-dependencies]
-async_rest = ["google-auth[aiohttp] >= 2.14.1, < 3.0.0", "aiohttp >= 3.9.0"]
+async_rest = ["google-auth[aiohttp] >= 2.14.1, < 3.0.0", "aiohttp >= 3.13.4"]
 grpc = [
   "grpcio >= 1.41.0, < 2.0.0",
   "grpcio >= 1.49.1, < 2.0.0; python_version >= '3.11'",
diff --git a/packages/google-api-core/testing/constraints-async-rest-3.10.txt b/packages/google-api-core/testing/constraints-async-rest-3.10.txt
index b5bf92d008f2..cfa4ed99ceb9 100644
--- a/packages/google-api-core/testing/constraints-async-rest-3.10.txt
+++ b/packages/google-api-core/testing/constraints-async-rest-3.10.txt
@@ -12,8 +12,4 @@ requests==2.25.0
 grpcio==1.41.0
 grpcio-status==1.41.0
 proto-plus==1.22.3
-# Note: We pin aiohttp to 3.9.0 to avoid deprecation warnings about '@coroutine'
-# decorators which were deprecated since Python 3.8. When older versions of aiohttp
-# load, because they used @coroutine deep inside their internals, the warnings
-# bubble up and cause our nox session to fail.
-aiohttp==3.9.0
+aiohttp==3.13.4