diff --git a/docs/requirements.txt b/docs/requirements.txt
index fe04b64ba557e7f26295bde6b23e9ff49010df3a..9fffc3bf2e315ee76a9fd3cf03588a5a31eeda95 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -1,3 +1,4 @@
+python>=3.8
 sphinx>=6
 pysolar==0.10.0
 docopt