diff --git a/README.md b/README.md
index 5650459..4b47e7f 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,6 @@
 ---
 language: ja
-license: cc-by-sa-4.0
+license: cc-by-sa-3.0
 datasets:
 - wikipedia
 widget: