diff --git a/requirements.txt b/requirements.txt
index ab681f8e0458e9ac84fd7a11424c520f5fc2dc71..1b70a24eff7ee88554a13ed9133358c00ab17d04 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,4 @@
-sphinx==4.0.2
+sphinx>=6.1
 pysolar==1.10.0
 docopt
 nbsphinx>=0.8.6