diff --git a/.readthedocs.yaml b/.readthedocs.yaml
index 62f82f54b65..db2e1cd0b9a 100644
--- a/.readthedocs.yaml
+++ b/.readthedocs.yaml
@@ -1,12 +1,14 @@
 version: 2
 
 build:
-  os: ubuntu-20.04
+  os: ubuntu-22.04
   tools:
     python: mambaforge-4.10
   jobs:
     post_checkout:
       - (git --no-pager log --pretty="tformat:%s" -1 | grep -vqF "[skip-rtd]") || exit 183
+    pre_install:
+      - git update-index --assume-unchanged doc/conf.py ci/requirements/doc.yml
 
 conda:
   environment: ci/requirements/doc.yml