diff --git a/CHANGELOG.md b/CHANGELOG.md
index ec4bdc7d..3ae931f1 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,13 @@
+<a name="1.2.2"></a>
+## [1.2.2](https://github.com/vuejs/composition-api/compare/v1.2.1...v1.2.2) (2021-09-24)
+
+
+### Reverts
+
+* "fix: use `.mjs` by default", close [#815](https://github.com/vuejs/composition-api/issues/815) ([96899ce](https://github.com/vuejs/composition-api/commit/96899ce))
+
+
+
 <a name="1.2.1"></a>
 ## [1.2.1](https://github.com/vuejs/composition-api/compare/v1.2.0...v1.2.1) (2021-09-21)
 
diff --git a/README.md b/README.md
index 4d9503ed..6528db2c 100644
--- a/README.md
+++ b/README.md
@@ -41,7 +41,7 @@ Include `@vue/composition-api` after Vue and it will install itself automaticall
 <!--cdn-links-start-->
 ```html
 <script src="https://cdn.jsdelivr.net/npm/vue@2.6"></script>
-<script src="https://cdn.jsdelivr.net/npm/@vue/composition-api@1.2.1"></script>
+<script src="https://cdn.jsdelivr.net/npm/@vue/composition-api@1.2.2"></script>
 ```
 <!--cdn-links-end-->
 
diff --git a/README.zh-CN.md b/README.zh-CN.md
index 1c9703cb..0def25ca 100644
--- a/README.zh-CN.md
+++ b/README.zh-CN.md
@@ -40,7 +40,7 @@ import { ref, reactive } from '@vue/composition-api'
 <!--cdn-links-start-->
 ```html
 <script src="https://cdn.jsdelivr.net/npm/vue@2.6"></script>
-<script src="https://cdn.jsdelivr.net/npm/@vue/composition-api@1.2.1"></script>
+<script src="https://cdn.jsdelivr.net/npm/@vue/composition-api@1.2.2"></script>
 ```
 <!--cdn-links-end-->
 
diff --git a/package.json b/package.json
index 829f85ca..f4d15e2d 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@vue/composition-api",
-  "version": "1.2.1",
+  "version": "1.2.2",
   "description": "Provide logic composition capabilities for Vue.",
   "keywords": [
     "vue",