diff --git a/README.md b/README.md
index 55e797bb7..530a5dbea 100644
--- a/README.md
+++ b/README.md
@@ -182,7 +182,7 @@ Please see the [Contribution Guide](./CONTRIBUTING.md).
 
 :four_leaf_clover: Copyright
 ----------------------------------------------------------------
-> Copyright (c) 2014-2019 syuilo
+> Copyright (c) 2014-2020 syuilo
 
 Misskey is open-source software licensed under the [GNU AGPLv3](LICENSE).
 
diff --git a/src/const.json b/src/const.json
index f0892e54c..29649061e 100644
--- a/src/const.json
+++ b/src/const.json
@@ -1,3 +1,3 @@
 {
-	"copyright": "Copyright (c) 2014-2019 syuilo"
+	"copyright": "Copyright (c) 2014-2020 syuilo"
 }