diff --git a/.readthedocs.yaml b/.readthedocs.yaml
index 7b7ddf8d..4b36b5af 100644
--- a/.readthedocs.yaml
+++ b/.readthedocs.yaml
@@ -9,7 +9,7 @@ version: 2
 build:
   os: ubuntu-24.04
   tools:
-    python: "3.9"
+    python: "3.14"
 
 # Build documentation in the docs/ directory with Sphinx
 sphinx:
diff --git a/docs/conf.py b/docs/conf.py
index d62be297..b3a2aed0 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -115,10 +115,13 @@
     ('py:class', 'websockets.datastructures.SupportsKeysAndGetItem'),
     ('py:class', 'websockets.typing.Subprotocol'),
 
-    # httpx: no sphinx docs yet https://github.com/encode/httpx/discussions/3091
+    # httpx/httpx2: no sphinx docs yet https://github.com/encode/httpx/discussions/3091
     ('py:class', 'httpx.AsyncClient'),
     ('py:class', 'httpx.Client'),
     ('py:class', 'httpx.Headers'),
+    ('py:class', 'httpx2.AsyncClient'),
+    ('py:class', 'httpx2.Client'),
+    ('py:class', 'httpx2.Headers'),
 
     # botocore: no sphinx docs
     ('py:class', 'botocore.auth.BaseSigner'),
diff --git a/docs/requirements.txt b/docs/requirements.txt
index d9ce8ad1..690c3015 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -1,4 +1,3 @@
-sphinx>=5.3.0,<6
-sphinx_rtd_theme>=0.4,<1
-sphinx-argparse==0.2.5
-multidict<5.0,>=4.5
+sphinx>=8.1.0,<9
+sphinx_rtd_theme>=3.0.2,<4
+sphinx-argparse==0.5.2