diff --git a/.readthedocs.yaml b/.readthedocs.yaml
index b729cfff7..9892bd5eb 100644
--- a/.readthedocs.yaml
+++ b/.readthedocs.yaml
@@ -11,8 +11,8 @@ build:
   apt_packages:
     - llvm-15
   jobs:
-    post_system_dependencies:
-      - update-alternatives --install /usr/bin/llvm-config llvm-config /usr/bin/llvm-config-15 200
+    post_checkout:
+      - sed -i "s/'llvm-config'/'llvm-config-15'/g" ffi/build.py
 
 sphinx:
   configuration: docs/source/conf.py