diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index cb4a45ac..10de9256 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -10,7 +10,7 @@ jobs:
       - name: Checkout repository
         uses: actions/checkout@v1
       - name: Set up Python 3.x
-        uses: actions/setup-python@v4
+        uses: actions/setup-python@v5
         with:
           python-version: 3.x
       - name: Install dependencies
@@ -24,7 +24,7 @@ jobs:
       - name: Checkout Repository
         uses: actions/checkout@v1
       - name: Set up Python 3.x
-        uses: actions/setup-python@v4
+        uses: actions/setup-python@v5
         with:
           python-version: 3.x
       - name: Install dependencies
@@ -40,7 +40,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12"]
+        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12", "3.13"]
         os: ["ubuntu-latest"]
         experimental: [false]
         nox-session: ['']
@@ -58,14 +58,10 @@ jobs:
         uses: actions/checkout@v2
 
       - name: Set up Python - ${{ matrix.python-version }}
-        uses: actions/setup-python@v2
+        uses: actions/setup-python@v5
         with:
           python-version: ${{ matrix.python-version }}
-
-      - name: Set up Python 3.x to run nox
-        uses: actions/setup-python@v2
-        with:
-          python-version: 3.x
+          allow-prereleases: true
 
       - name: Install Dependencies
         run: python -m pip install --upgrade nox
diff --git a/elastic_transport/_node/_http_aiohttp.py b/elastic_transport/_node/_http_aiohttp.py
index 79dbf820..b75aa868 100644
--- a/elastic_transport/_node/_http_aiohttp.py
+++ b/elastic_transport/_node/_http_aiohttp.py
@@ -182,7 +182,7 @@ async def perform_request(  # type: ignore[override]
                 data=body_to_send,
                 headers=request_headers,
                 timeout=aiohttp_timeout,
-                **kwargs,
+                **kwargs,  # type: ignore[arg-type]
             ) as response:
                 if is_head:  # We actually called 'GET' so throw away the data.
                     await response.release()
diff --git a/elastic_transport/_node/_http_urllib3.py b/elastic_transport/_node/_http_urllib3.py
index f9b46094..45514ae5 100644
--- a/elastic_transport/_node/_http_urllib3.py
+++ b/elastic_transport/_node/_http_urllib3.py
@@ -199,7 +199,7 @@ def perform_request(
                 body=body,
                 exception=err,
             )
-            raise err from None
+            raise err from e
 
         meta = ApiResponseMeta(
             node=self.config,
diff --git a/elastic_transport/_node/_urllib3_chain_certs.py b/elastic_transport/_node/_urllib3_chain_certs.py
index 30790eb6..e36449b6 100644
--- a/elastic_transport/_node/_urllib3_chain_certs.py
+++ b/elastic_transport/_node/_urllib3_chain_certs.py
@@ -105,14 +105,20 @@ def _validate_conn(self, conn: HTTPSConnection) -> None:  # type: ignore[overrid
 
             fingerprints: List[bytes]
             try:
-                # 'get_verified_chain()' and 'Certificate.public_bytes()' are private APIs
-                # in CPython 3.10. They're not documented anywhere yet but seem to work
-                # and we need them for Security on by Default so... onwards we go!
-                # See: https://github.com/python/cpython/pull/25467
-                fingerprints = [
-                    hash_func(cert.public_bytes(_ENCODING_DER)).digest()
-                    for cert in conn.sock._sslobj.get_verified_chain()  # type: ignore[union-attr]
-                ]
+                if sys.version_info >= (3, 13):
+                    fingerprints = [
+                        hash_func(cert).digest()
+                        for cert in conn.sock.get_verified_chain()
+                    ]
+                else:
+                    # 'get_verified_chain()' and 'Certificate.public_bytes()' are private APIs
+                    # in CPython 3.10. They're not documented anywhere yet but seem to work
+                    # and we need them for Security on by Default so... onwards we go!
+                    # See: https://github.com/python/cpython/pull/25467
+                    fingerprints = [
+                        hash_func(cert.public_bytes(_ENCODING_DER)).digest()
+                        for cert in conn.sock._sslobj.get_verified_chain()  # type: ignore[union-attr]
+                    ]
             except RERAISE_EXCEPTIONS:  # pragma: nocover
                 raise
             # Because these are private APIs we are super careful here
diff --git a/noxfile.py b/noxfile.py
index 4d8a11b4..141cae4b 100644
--- a/noxfile.py
+++ b/noxfile.py
@@ -59,7 +59,7 @@ def lint(session):
     session.run("mypy", "--strict", "--show-error-codes", "elastic_transport/")
 
 
-@nox.session(python=["3.8", "3.9", "3.10", "3.11", "3.12"])
+@nox.session(python=["3.8", "3.9", "3.10", "3.11", "3.12", "3.13"])
 def test(session):
     session.install(".[develop]")
     session.run(
diff --git a/setup.py b/setup.py
index f55392e3..2e10c4f8 100644
--- a/setup.py
+++ b/setup.py
@@ -88,6 +88,7 @@
         "Programming Language :: Python :: 3.10",
         "Programming Language :: Python :: 3.11",
         "Programming Language :: Python :: 3.12",
+        "Programming Language :: Python :: 3.13",
         "Programming Language :: Python :: Implementation :: CPython",
         "Programming Language :: Python :: Implementation :: PyPy",
     ],