diff --git a/docs/requirements.txt b/docs/requirements.txt
index 573862b..16c6a74 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -8,7 +8,7 @@ corner
 uncertainties
 seaborn
 nbsphinx
-jupyter-sphinx
+jupyter-sphinx==0.2.4
 sphinx_rtd_theme
 coverage
-coveralls
\ No newline at end of file
+coveralls