diff --git a/docs/build_all.py b/docs/build_all.py
index a53330f..27b7878 100644
--- a/docs/build_all.py
+++ b/docs/build_all.py
@@ -46,6 +46,7 @@
 for tag in tags:
     os.environ["VERSION_INFO"] = repr(tag)
     subprocess.run(["git", "checkout", tag], shell=True)
+    subprocess.run(["git", "checkout", "main", "--", "conf.py"], shell=True)
     files = glob.glob("apidocs/*.rst")
     for f in files:
         os.remove(f)