diff --git a/.ci/test-matrix.yml b/.ci/test-matrix.yml
index 94b1f89b..8bc2b865 100755
--- a/.ci/test-matrix.yml
+++ b/.ci/test-matrix.yml
@@ -1,18 +1,18 @@
 STACK_VERSION:
-  - 7.x-SNAPSHOT
+  - 7.13-SNAPSHOT
 
 TEST_SUITE:
   - platinum
 
 PYTHON_VERSION:
-  - 2.7
-  - 3.4
-  - 3.5
-  - 3.6
-  - 3.7
-  - 3.8
-  - 3.9
-  - 3.10
+  - "2.7"
+  - "3.4"
+  - "3.5"
+  - "3.6"
+  - "3.7"
+  - "3.8"
+  - "3.9"
+  - "3.10"
 
 PYTHON_CONNECTION_CLASS:
   - Urllib3HttpConnection
diff --git a/noxfile.py b/noxfile.py
index 4f8d5cc7..6d28cad7 100644
--- a/noxfile.py
+++ b/noxfile.py
@@ -47,7 +47,7 @@ def format(session):
 
 @nox.session()
 def lint(session):
-    session.install("flake8", "black", "mypy", "isort")
+    session.install("flake8", "black", "mypy", "isort", "types-requests")
 
     session.run("isort", "--check", "--profile=black", *SOURCE_FILES)
     session.run("black", "--target-version=py27", "--check", *SOURCE_FILES)
diff --git a/test_elasticsearch/test_connection.py b/test_elasticsearch/test_connection.py
index 878c661e..f2789157 100644
--- a/test_elasticsearch/test_connection.py
+++ b/test_elasticsearch/test_connection.py
@@ -188,7 +188,7 @@ class TestBaseConnection(TestCase):
             conn = Connection()
             assert (
                 conn.headers["accept"]
-                == "application/vnd.elasticsearch+json;compatible-with=8"
+                == "application/vnd.elasticsearch+json;compatible-with=7"
             )
         finally:
             os.environ.pop("ELASTIC_CLIENT_APIVERSIONING")