diff --git a/requirements.txt b/requirements.txt
index 954d2cfd0..4d6b2210c 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,19 +2,24 @@ numpy>=1.13.3
 matplotlib>=2.0.0
 h5py>=2.7
 scipy>=0.16
-sphinx_book_theme
-nbsphinx>=0.3.1
+numba>=0.40.0
+
 pytest>=3.6
 nbval>=0.9.0
 pytest-cov>=2.6.0
+
 flake8>=3.5.0
-numba>=0.40.0
-numpydoc
+
+sphinx<8.2.0
+sphinx_book_theme
 sphinxcontrib-bibtex
 sphinx-math-dollar
 sphinx-copybutton
 sphinx-prompt
 sphinx-mdinclude
+numpydoc
+nbsphinx>=0.3.1
+
 importlib-metadata
 prettytable
 codespell