diff --git a/docs/requirements.txt b/docs/requirements.txt
index 5d146d0..aecfadb 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -1,6 +1,5 @@
 -e .
 ipykernel
 setuptools>=18.5
-sphinx>=1.3.6
+sphinx
 sphinx-rtd-theme
-nbsphinx==0.2.14