diff --git a/netlify.toml b/netlify.toml
index 893e7068..d5992af4 100644
--- a/netlify.toml
+++ b/netlify.toml
@@ -3,4 +3,4 @@ publish = "docs/html"
 command = "bash -x tools/generate_docs_netlify.sh"
 
 [build.environment]
-PYTHON_VERSION = "3.10"
+PYTHON_VERSION = "3.9"