diff --git a/.readthedocs.yml b/.readthedocs.yml
index 0c8f935d58c..b83ba05b128 100644
--- a/.readthedocs.yml
+++ b/.readthedocs.yml
@@ -6,6 +6,10 @@ build:
   os: ubuntu-22.04
   tools:
     python: "3"
+  jobs:
+    post_checkout:
+    - git remote add upstream https://github.com/python-pillow/Pillow.git # For forks
+    - git fetch upstream --tags
 
 python:
   install: