diff --git a/CHANGELOG.prerelease.md b/CHANGELOG.prerelease.md
index 9f0afe1f6501..6dedf07173bc 100644
--- a/CHANGELOG.prerelease.md
+++ b/CHANGELOG.prerelease.md
@@ -1,3 +1,8 @@
+## 8.4.0-alpha.9
+
+- Core: Add unified UI Testing Module - [#29241](https://github.com/storybookjs/storybook/pull/29241), thanks @yannbf!
+- Svelte: Improve argTypes inference with `svelte2tsx` - support runes - [#29423](https://github.com/storybookjs/storybook/pull/29423), thanks @JReinhold!
+
 ## 8.4.0-alpha.8
 
 - Addon-Test: Support for `@vitest/browser` v2.1.2 - [#29407](https://github.com/storybookjs/storybook/pull/29407), thanks @strozw!
diff --git a/code/package.json b/code/package.json
index cca88d03d559..53fd151287f0 100644
--- a/code/package.json
+++ b/code/package.json
@@ -293,5 +293,6 @@
         "Dependency Upgrades"
       ]
     ]
-  }
+  },
+  "deferredNextVersion": "8.4.0-alpha.9"
 }
diff --git a/docs/versions/next.json b/docs/versions/next.json
index 5419ab744ce7..45e8540addf0 100644
--- a/docs/versions/next.json
+++ b/docs/versions/next.json
@@ -1 +1 @@
-{"version":"8.4.0-alpha.8","info":{"plain":"- Addon-Test: Support for `@vitest/browser` v2.1.2 - [#29407](https://github.com/storybookjs/storybook/pull/29407), thanks @strozw!\n- ConfigFile: Fix `export { X }` parsing - [#29344](https://github.com/storybookjs/storybook/pull/29344), thanks @vctqs1!\n- Core: Fix building Storybook deleting project root files - [#29371](https://github.com/storybookjs/storybook/pull/29371), thanks @JReinhold!\n- Interactions: Escape xml of interactions errors - [#29414](https://github.com/storybookjs/storybook/pull/29414), thanks @kasperpeulen!\n- Svelte: Add v5 stories to CLI templates - [#29382](https://github.com/storybookjs/storybook/pull/29382), thanks @JReinhold!\n- Test: Remove unused `util` dependency - [#29310](https://github.com/storybookjs/storybook/pull/29310), thanks @JReinhold!\n- UI: Fix RefIndicator to use CheckIcon instead of string - [#29209](https://github.com/storybookjs/storybook/pull/29209), thanks @JSMike!\n- UI: Simple tag filtering - [#29333](https://github.com/storybookjs/storybook/pull/29333), thanks @shilman!"}}
+{"version":"8.4.0-alpha.9","info":{"plain":"- Core: Add unified UI Testing Module - [#29241](https://github.com/storybookjs/storybook/pull/29241), thanks @yannbf!\n- Svelte: Improve argTypes inference with `svelte2tsx` - support runes - [#29423](https://github.com/storybookjs/storybook/pull/29423), thanks @JReinhold!"}}