diff --git a/.readthedocs.yaml b/.readthedocs.yaml
index f7370f1bb98..6380b34adec 100644
--- a/.readthedocs.yaml
+++ b/.readthedocs.yaml
@@ -17,7 +17,7 @@ build:
   os: ubuntu-24.04
   tools:
     python: >-
-      3.12
+      3.13
   apt_packages:
     - inkscape
   jobs:
diff --git a/doc/en/explanation/goodpractices.rst b/doc/en/explanation/goodpractices.rst
index d97dda06417..4920309b9d6 100644
--- a/doc/en/explanation/goodpractices.rst
+++ b/doc/en/explanation/goodpractices.rst
@@ -354,7 +354,7 @@ See the :confval:`strict` documentation for the options it enables and their eff
 If pytest adds new strictness options in the future, they will also be enabled in strict mode.
 Therefore, you should only enable strict mode if you use a pinned/locked version of pytest,
 or if you want to proactively adopt new strictness options as they are added.
-If you don't want to automatically pick up new options, you can enable options individually::
+If you don't want to automatically pick up new options, you can enable options individually:
 
 .. tab:: toml
 
@@ -376,7 +376,7 @@ If you don't want to automatically pick up new options, you can enable options i
         strict_parametrization_ids = true
         strict_xfail = true
 
-If you want to use strict mode but having trouble with a specific option, you can turn it off individually::
+If you want to use strict mode but having trouble with a specific option, you can turn it off individually:
 
 .. tab:: toml
 
diff --git a/tox.ini b/tox.ini
index b6fcecc886a..5c2106ee5b4 100644
--- a/tox.ini
+++ b/tox.ini
@@ -111,7 +111,7 @@ setenv =
 description =
     build the documentation site under \
     `{toxinidir}{/}doc{/}en{/}_build{/}html` with `{basepython}`
-basepython = python3.12 # sync with rtd to get errors
+basepython = python3.13 # Sync with .readthedocs.yaml to get errors.
 usedevelop = True
 deps =
     -r{toxinidir}/doc/en/requirements.txt