diff --git a/.readthedocs.yaml b/.readthedocs.yaml
index 010dc6e0c1..c4f7c43a42 100644
--- a/.readthedocs.yaml
+++ b/.readthedocs.yaml
@@ -3,9 +3,9 @@
 version: 2
 
 build:
-  os: ubuntu-22.04
+  os: ubuntu-24.04
   tools:
-    python: "3.11"
+    python: "3.12"
   jobs:
     pre_build:
       - python -m pip install -r https://gitlab.isc.org/isc-projects/bind9/-/raw/main/doc/arm/requirements.txt
diff --git a/doc/arm/requirements.txt b/doc/arm/requirements.txt
index 8d9d05ffb0..811c3d9493 100644
--- a/doc/arm/requirements.txt
+++ b/doc/arm/requirements.txt
@@ -1,3 +1,3 @@
-Sphinx==9.0.4
+Sphinx==9.1.0
 docutils==0.22.4
 sphinx_rtd_theme==3.1.0