diff --git a/README.md b/README.md
index 2d9263c..4ba24ee 100644
--- a/README.md
+++ b/README.md
@@ -25,6 +25,7 @@ Write in your ESLint configurations: http://eslint.org/docs/user-guide/configuri
 
 ### Configs
 
+- `plugin:@mysticatea/es2021` ... Basic configuration for ES2021.
 - `plugin:@mysticatea/es2020` ... Basic configuration for ES2020.
 - `plugin:@mysticatea/es2019` ... Basic configuration for ES2019.
 - `plugin:@mysticatea/es2018` ... Basic configuration for ES2018.
diff --git a/lib/configs.js b/lib/configs.js
index de02178..9d9e8ab 100644
--- a/lib/configs.js
+++ b/lib/configs.js
@@ -14,5 +14,6 @@ module.exports = {
     es2018: require("./configs/es2018"),
     es2019: require("./configs/es2019"),
     es2020: require("./configs/es2020"),
+    es2021: require("./configs/es2021"),
     es5: require("./configs/es5"),
 }
diff --git a/lib/configs/_override-2021.js b/lib/configs/_override-2021.js
new file mode 100644
index 0000000..0d43486
--- /dev/null
+++ b/lib/configs/_override-2021.js
@@ -0,0 +1,7 @@
+"use strict"
+
+module.exports = {
+    parserOptions: {
+        ecmaVersion: 2021,
+    },
+}
diff --git a/lib/configs/es2021.js b/lib/configs/es2021.js
new file mode 100644
index 0000000..ea682a9
--- /dev/null
+++ b/lib/configs/es2021.js
@@ -0,0 +1,18 @@
+"use strict"
+
+module.exports = {
+    extends: [
+        require.resolve("./_base.js"),
+        require.resolve("./_override-2015.js"),
+        require.resolve("./_override-2016.js"),
+        require.resolve("./_override-2017.js"),
+        require.resolve("./_override-2018.js"),
+        require.resolve("./_override-2019.js"),
+        require.resolve("./_override-2020.js"),
+        require.resolve("./_override-2021.js"),
+        require.resolve("./_override-ts.js"),
+        require.resolve("./_override-vue.js"),
+        require.resolve("./_override-mocha.js"),
+        require.resolve("./_override-special.js"),
+    ],
+}