diff --git a/readthedocs.yml b/readthedocs.yml
index 03acd3687f744c05b217a9b916b05681e6f0c2ee..5b0ffa7f4901e36c5457491a43575659bba85e8c 100644
--- a/readthedocs.yml
+++ b/readthedocs.yml
@@ -9,7 +9,7 @@ build:
   os: ubuntu-20.04
   tools:
     python: "3.9"
-    nodejs: 16
+    nodejs: "16"
 
 # Build documentation in the docs/ directory with Sphinx
 sphinx:
diff --git a/setup.py b/setup.py
index f20748ee61b9583dee30ba549b526c385a2ea9f3..366e9b05458dd0010f42d0a6f238af80cd7f39c2 100644
--- a/setup.py
+++ b/setup.py
@@ -36,5 +36,5 @@ setuptools.setup(
     #                   'matplotlib',
     #                   'astropy',
     #                   ],
-    python_requires='>=3.8',
+    python_requires='>=3.9',
 )