diff --git a/.gitignore b/.gitignore
index 7bee7648a16..822c97afccd 100644
--- a/.gitignore
+++ b/.gitignore
@@ -165,4 +165,5 @@ mlruns/
 
 # pdm
 .pdm-python
+.python-version
 .pdm-build/
diff --git a/.python-version-default b/.python-version-default
new file mode 100644
index 00000000000..bd28b9c5c27
--- /dev/null
+++ b/.python-version-default
@@ -0,0 +1 @@
+3.9