diff --git a/.readthedocs.yml b/.readthedocs.yml
index 9aff76d..8c303b9 100644
--- a/.readthedocs.yml
+++ b/.readthedocs.yml
@@ -3,6 +3,9 @@ build:
   os: ubuntu-22.04
   tools:
     python: "3"
+  jobs:
+    post_checkout:
+      - git fetch --unshallow || true
 submodules:
   include: all
 python:
@@ -10,6 +13,5 @@ python:
     - method: pip
       path: .
     - requirements: doc/requirements.txt
-  system_packages: true
 formats:
   - htmlzip