diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5b93e5998f2..1e0772ad68c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,20 @@
+# [3.0.0-rc.9](https://github.com/vuejs/vue-next/compare/v3.0.0-rc.8...v3.0.0-rc.9) (2020-08-26)
+
+
+### Bug Fixes
+
+* **runtime-core:** class and style should be properly normalized in cloneVNode ([#1967](https://github.com/vuejs/vue-next/issues/1967)) ([9153fc2](https://github.com/vuejs/vue-next/commit/9153fc2d8a5c9d24d79161586c70840ae7b84b8b)), closes [#1964](https://github.com/vuejs/vue-next/issues/1964)
+* **runtime-core:** fix resolving assets from mixins and extends ([0cb7f7f](https://github.com/vuejs/vue-next/commit/0cb7f7f880961162a6ca0b51bf308fbf83160eb5)), closes [#1963](https://github.com/vuejs/vue-next/issues/1963)
+* **runtime-core:** properly call lifecycle hooks in chained mixins & extends ([#1974](https://github.com/vuejs/vue-next/issues/1974)) ([6df0e73](https://github.com/vuejs/vue-next/commit/6df0e738cb9ae6db0c0e9c3c70d81147521bfe7f)), closes [#1973](https://github.com/vuejs/vue-next/issues/1973)
+
+
+### Performance Improvements
+
+* **reactivity:** add existing index or non-integer prop on Array should not trigger length dependency ([#1969](https://github.com/vuejs/vue-next/issues/1969)) ([d5c4f6e](https://github.com/vuejs/vue-next/commit/d5c4f6ed4d6feea9be56dcc0859592f03b6a5d9a))
+* **reactivity:** avoid triggering Map.has twice on non-reactive keys ([#1972](https://github.com/vuejs/vue-next/issues/1972)) ([97bc30e](https://github.com/vuejs/vue-next/commit/97bc30edadb52e57e29b3c6e36c04ec71916103c))
+
+
+
 # [3.0.0-rc.8](https://github.com/vuejs/vue-next/compare/v3.0.0-rc.7...v3.0.0-rc.8) (2020-08-25)
 
 
diff --git a/package.json b/package.json
index b13a0c69b58..4b2884205ef 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "private": true,
-  "version": "3.0.0-rc.8",
+  "version": "3.0.0-rc.9",
   "workspaces": [
     "packages/*"
   ],
diff --git a/packages/compiler-core/package.json b/packages/compiler-core/package.json
index 6f9dc40c570..c2f95aa2916 100644
--- a/packages/compiler-core/package.json
+++ b/packages/compiler-core/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@vue/compiler-core",
-  "version": "3.0.0-rc.8",
+  "version": "3.0.0-rc.9",
   "description": "@vue/compiler-core",
   "main": "index.js",
   "module": "dist/compiler-core.esm-bundler.js",
@@ -30,7 +30,7 @@
   },
   "homepage": "https://github.com/vuejs/vue-next/tree/master/packages/compiler-core#readme",
   "dependencies": {
-    "@vue/shared": "3.0.0-rc.8",
+    "@vue/shared": "3.0.0-rc.9",
     "@babel/parser": "^7.10.4",
     "@babel/types": "^7.10.4",
     "estree-walker": "^2.0.1",
diff --git a/packages/compiler-dom/package.json b/packages/compiler-dom/package.json
index f24dfa9a8e5..bf97c79a845 100644
--- a/packages/compiler-dom/package.json
+++ b/packages/compiler-dom/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@vue/compiler-dom",
-  "version": "3.0.0-rc.8",
+  "version": "3.0.0-rc.9",
   "description": "@vue/compiler-dom",
   "main": "index.js",
   "module": "dist/compiler-dom.esm-bundler.js",
@@ -35,7 +35,7 @@
   },
   "homepage": "https://github.com/vuejs/vue-next/tree/master/packages/compiler-dom#readme",
   "dependencies": {
-    "@vue/shared": "3.0.0-rc.8",
-    "@vue/compiler-core": "3.0.0-rc.8"
+    "@vue/shared": "3.0.0-rc.9",
+    "@vue/compiler-core": "3.0.0-rc.9"
   }
 }
diff --git a/packages/compiler-sfc/package.json b/packages/compiler-sfc/package.json
index bf02a1deb97..180aa68fab7 100644
--- a/packages/compiler-sfc/package.json
+++ b/packages/compiler-sfc/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@vue/compiler-sfc",
-  "version": "3.0.0-rc.8",
+  "version": "3.0.0-rc.9",
   "description": "@vue/compiler-sfc",
   "main": "dist/compiler-sfc.cjs.js",
   "types": "dist/compiler-sfc.d.ts",
@@ -31,15 +31,15 @@
   },
   "homepage": "https://github.com/vuejs/vue-next/tree/master/packages/compiler-sfc#readme",
   "peerDependencies": {
-    "vue": "3.0.0-rc.8"
+    "vue": "3.0.0-rc.9"
   },
   "dependencies": {
     "@babel/parser": "^7.10.4",
     "@babel/types": "^7.10.4",
-    "@vue/compiler-core": "3.0.0-rc.8",
-    "@vue/compiler-dom": "3.0.0-rc.8",
-    "@vue/compiler-ssr": "3.0.0-rc.8",
-    "@vue/shared": "3.0.0-rc.8",
+    "@vue/compiler-core": "3.0.0-rc.9",
+    "@vue/compiler-dom": "3.0.0-rc.9",
+    "@vue/compiler-ssr": "3.0.0-rc.9",
+    "@vue/shared": "3.0.0-rc.9",
     "consolidate": "^0.15.1",
     "estree-walker": "^2.0.1",
     "hash-sum": "^2.0.0",
diff --git a/packages/compiler-ssr/package.json b/packages/compiler-ssr/package.json
index 47f8441235a..326a8707557 100644
--- a/packages/compiler-ssr/package.json
+++ b/packages/compiler-ssr/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@vue/compiler-ssr",
-  "version": "3.0.0-rc.8",
+  "version": "3.0.0-rc.9",
   "description": "@vue/compiler-ssr",
   "main": "dist/compiler-ssr.cjs.js",
   "types": "dist/compiler-ssr.d.ts",
@@ -27,7 +27,7 @@
   },
   "homepage": "https://github.com/vuejs/vue-next/tree/master/packages/compiler-ssr#readme",
   "dependencies": {
-    "@vue/shared": "3.0.0-rc.8",
-    "@vue/compiler-dom": "3.0.0-rc.8"
+    "@vue/shared": "3.0.0-rc.9",
+    "@vue/compiler-dom": "3.0.0-rc.9"
   }
 }
diff --git a/packages/reactivity/package.json b/packages/reactivity/package.json
index 30b3a98775b..17f6d6c6dcb 100644
--- a/packages/reactivity/package.json
+++ b/packages/reactivity/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@vue/reactivity",
-  "version": "3.0.0-rc.8",
+  "version": "3.0.0-rc.9",
   "description": "@vue/reactivity",
   "main": "index.js",
   "module": "dist/reactivity.esm-bundler.js",
@@ -35,6 +35,6 @@
   },
   "homepage": "https://github.com/vuejs/vue-next/tree/master/packages/reactivity#readme",
   "dependencies": {
-    "@vue/shared": "3.0.0-rc.8"
+    "@vue/shared": "3.0.0-rc.9"
   }
 }
diff --git a/packages/runtime-core/package.json b/packages/runtime-core/package.json
index 1a2bdeaaf48..0d1006c397a 100644
--- a/packages/runtime-core/package.json
+++ b/packages/runtime-core/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@vue/runtime-core",
-  "version": "3.0.0-rc.8",
+  "version": "3.0.0-rc.9",
   "description": "@vue/runtime-core",
   "main": "index.js",
   "module": "dist/runtime-core.esm-bundler.js",
@@ -31,7 +31,7 @@
   },
   "homepage": "https://github.com/vuejs/vue-next/tree/master/packages/runtime-core#readme",
   "dependencies": {
-    "@vue/shared": "3.0.0-rc.8",
-    "@vue/reactivity": "3.0.0-rc.8"
+    "@vue/shared": "3.0.0-rc.9",
+    "@vue/reactivity": "3.0.0-rc.9"
   }
 }
diff --git a/packages/runtime-dom/package.json b/packages/runtime-dom/package.json
index acda1583e32..afa0ee89ddb 100644
--- a/packages/runtime-dom/package.json
+++ b/packages/runtime-dom/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@vue/runtime-dom",
-  "version": "3.0.0-rc.8",
+  "version": "3.0.0-rc.9",
   "description": "@vue/runtime-dom",
   "main": "index.js",
   "module": "dist/runtime-dom.esm-bundler.js",
@@ -34,8 +34,8 @@
   },
   "homepage": "https://github.com/vuejs/vue-next/tree/master/packages/runtime-dom#readme",
   "dependencies": {
-    "@vue/shared": "3.0.0-rc.8",
-    "@vue/runtime-core": "3.0.0-rc.8",
+    "@vue/shared": "3.0.0-rc.9",
+    "@vue/runtime-core": "3.0.0-rc.9",
     "csstype": "^2.6.8"
   }
 }
diff --git a/packages/runtime-test/package.json b/packages/runtime-test/package.json
index fb6533e0dde..db2a695085e 100644
--- a/packages/runtime-test/package.json
+++ b/packages/runtime-test/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@vue/runtime-test",
-  "version": "3.0.0-rc.8",
+  "version": "3.0.0-rc.9",
   "description": "@vue/runtime-test",
   "private": true,
   "main": "index.js",
@@ -24,7 +24,7 @@
   },
   "homepage": "https://github.com/vuejs/vue-next/tree/master/packages/runtime-test#readme",
   "dependencies": {
-    "@vue/shared": "3.0.0-rc.8",
-    "@vue/runtime-core": "3.0.0-rc.8"
+    "@vue/shared": "3.0.0-rc.9",
+    "@vue/runtime-core": "3.0.0-rc.9"
   }
 }
diff --git a/packages/server-renderer/package.json b/packages/server-renderer/package.json
index a063008d0ab..2f16dcf285d 100644
--- a/packages/server-renderer/package.json
+++ b/packages/server-renderer/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@vue/server-renderer",
-  "version": "3.0.0-rc.8",
+  "version": "3.0.0-rc.9",
   "description": "@vue/server-renderer",
   "main": "index.js",
   "types": "dist/server-renderer.d.ts",
@@ -27,10 +27,10 @@
   },
   "homepage": "https://github.com/vuejs/vue-next/tree/master/packages/server-renderer#readme",
   "peerDependencies": {
-    "vue": "3.0.0-rc.8"
+    "vue": "3.0.0-rc.9"
   },
   "dependencies": {
-    "@vue/shared": "3.0.0-rc.8",
-    "@vue/compiler-ssr": "3.0.0-rc.8"
+    "@vue/shared": "3.0.0-rc.9",
+    "@vue/compiler-ssr": "3.0.0-rc.9"
   }
 }
diff --git a/packages/shared/package.json b/packages/shared/package.json
index 49fae51d99c..dccd6c8b204 100644
--- a/packages/shared/package.json
+++ b/packages/shared/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@vue/shared",
-  "version": "3.0.0-rc.8",
+  "version": "3.0.0-rc.9",
   "description": "internal utils shared across @vue packages",
   "main": "index.js",
   "module": "dist/shared.esm-bundler.js",
diff --git a/packages/size-check/package.json b/packages/size-check/package.json
index 23a1a7a5038..47ac7da8c2b 100644
--- a/packages/size-check/package.json
+++ b/packages/size-check/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@vue/size-check",
-  "version": "3.0.0-rc.8",
+  "version": "3.0.0-rc.9",
   "private": true,
   "buildOptions": {
     "name": "Vue",
diff --git a/packages/template-explorer/package.json b/packages/template-explorer/package.json
index b5a468f0489..eb6471c089e 100644
--- a/packages/template-explorer/package.json
+++ b/packages/template-explorer/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@vue/template-explorer",
-  "version": "3.0.0-rc.8",
+  "version": "3.0.0-rc.9",
   "private": true,
   "buildOptions": {
     "formats": [
diff --git a/packages/vue/package.json b/packages/vue/package.json
index 8c37ab002d9..6f2f9b1df0b 100644
--- a/packages/vue/package.json
+++ b/packages/vue/package.json
@@ -1,6 +1,6 @@
 {
   "name": "vue",
-  "version": "3.0.0-rc.8",
+  "version": "3.0.0-rc.9",
   "description": "vue",
   "main": "index.js",
   "module": "dist/vue.runtime.esm-bundler.js",
@@ -37,9 +37,9 @@
   },
   "homepage": "https://github.com/vuejs/vue-next/tree/master/packages/vue#readme",
   "dependencies": {
-    "@vue/shared": "3.0.0-rc.8",
-    "@vue/compiler-dom": "3.0.0-rc.8",
-    "@vue/runtime-dom": "3.0.0-rc.8"
+    "@vue/shared": "3.0.0-rc.9",
+    "@vue/compiler-dom": "3.0.0-rc.9",
+    "@vue/runtime-dom": "3.0.0-rc.9"
   },
   "devDependencies": {
     "lodash": "^4.17.15",