more pins

requirements-docs.txt

@@ -1,8 +1,10 @@
 docutils<0.17,>=0.15  # sphinx-book-theme 0.2.0 has requirement docutils<0.17,>=0.15
+Sphinx<5,>=3  # sphinx-book-theme 0.3.3 has requirement sphinx<5,>=3
 sphinxcontrib-applehelp==1.0.4  # newer versions require sphinx 5
 sphinxcontrib-devhelp==1.0.2   # newer versions require sphinx 5
 sphinxcontrib-htmlhelp==2.0.1  # newer versions require sphinx 5
-Sphinx<5,>=3  # sphinx-book-theme 0.3.3 has requirement sphinx<5,>=3
+sphinxcontrib-qthelp==1.0.3  # newer versions require sphinx 5
+sphinxcontrib-serializinghtml==1.1.5  # newer versions require sphinx 5
 jsx-lexer
 lesscpy
 linkify-it-py