diff --git a/requirements.txt b/requirements.txt
index ba3a3ae172dc6be8481c3ad578d79f38285417f6..ab681f8e0458e9ac84fd7a11424c520f5fc2dc71 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,3 +1,4 @@
-pysolar==0.10.0
+sphinx==4.0.2
+pysolar==1.10.0
 docopt
-nbsphinx
+nbsphinx>=0.8.6