diff --git a/.github/workflows/build-doc.yml b/.github/workflows/build-doc.yml
index 3bb1e13..80346e2 100644
--- a/.github/workflows/build-doc.yml
+++ b/.github/workflows/build-doc.yml
@@ -23,6 +23,7 @@ on:
     branches:
     - master
     - doc
+    - fix-ci
 
 jobs:
   build-doc:
diff --git a/doc/requirements.txt b/doc/requirements.txt
index 9d9bf4b..9c0114d 100644
--- a/doc/requirements.txt
+++ b/doc/requirements.txt
@@ -1,6 +1,6 @@
 dataclasses
 recommonmark
-sphinx
+sphinx<7.0
 sphinx-autodoc-typehints
 sphinx_rtd_theme
 sphinxcontrib-bibtex