diff --git a/.readthedocs.yaml b/.readthedocs.yaml
index 496a11e..4c7c4c2 100644
--- a/.readthedocs.yaml
+++ b/.readthedocs.yaml
@@ -24,4 +24,4 @@ python:
    install:
      - requirements: docs/requirements.txt
      - requirements: requirements.txt
-   system_packages: true
+#   system_packages: true  # depricated
diff --git a/docs/conf.py b/docs/conf.py
index 7c1c444..ffeedeb 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -2,6 +2,8 @@
 import sys
 import os
 
+print(sys.executable)
+
 # to be able to import hostphot
 sys.path.insert(0, os.path.abspath("../src"))