diff --git a/.github/workflows/tests.yaml b/.github/workflows/tests.yaml
index e300b08a..8c487349 100644
--- a/.github/workflows/tests.yaml
+++ b/.github/workflows/tests.yaml
@@ -37,17 +37,8 @@ jobs:
       pull-requests: write
     strategy:
       matrix:
-        # psycopg 2.9.10 isn't supported on Python 3.9 for macos-14. See
-        # https://github.com/psycopg/psycopg2/issues/1737. But it is supported
-        # on macos-12. When Python 3.9 reaches end-of-life, we should change
-        # this back to only run the Mac tests on macos-latest.
-        os: [windows-latest, ubuntu-latest]
+        os: [macos-latest, windows-latest, ubuntu-latest]
         python-version: ["3.9", "3.13"]
-        include:
-          - os: macos-12
-            python-version: "3.9"
-          - os: macos-latest
-            python-version: "3.13"
       fail-fast: false
     steps:
       - name: Checkout code
diff --git a/requirements-test.txt b/requirements-test.txt
index 12b94c08..33b1d32f 100644
--- a/requirements-test.txt
+++ b/requirements-test.txt
@@ -1,7 +1,15 @@
 asyncpg==0.30.0
 mock==5.1.0
 pg8000==1.31.2
-psycopg2-binary==2.9.10
+
+# psycopg 2.9.10 isn't supported on Python 3.9 for macos-latest GitHub runner.
+# It is supported for macos-12 runner:
+# https://github.com/psycopg/psycopg2/issues/1737. But macos-12 runner is
+# deprecated: https://github.com/actions/runner-images/issues/10721. So we
+# install psycopg 2.9.9 on Python 3.9 for macos-latest runner.
+psycopg2-binary==2.9.9; python_version == "3.9" and sys_platform == "darwin" 
+psycopg2-binary==2.9.10; python_version > "3.9"
+
 pytest==8.3.4
 pytest-asyncio==0.24.0
 pytest-cov==6.0.0