diff --git a/README.md b/README.md
index e8dc7f0..9d9c886 100644
--- a/README.md
+++ b/README.md
@@ -17,7 +17,7 @@ You can see [the example notebook](https://nbviewer.jupyter.org/github/chezou/ta
 ## Requirements
 
 - Java 8+
-- Python 3.8+
+- Python 3.9+
 
 ### OS
 
diff --git a/docs/getting_started.rst b/docs/getting_started.rst
index 9be7b08..f4dbb15 100644
--- a/docs/getting_started.rst
+++ b/docs/getting_started.rst
@@ -11,7 +11,7 @@ Requirements
 
 * Python
 
-  * 3.8+
+  * 3.9+
 
 
 Installation