diff --git a/CHANGELOG.md b/CHANGELOG.md
index f847ca7b..b5ed860b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,15 @@
+# [9.0.0-beta.1](https://github.com/ForestAdmin/forest-rails/compare/v8.1.0...v9.0.0-beta.1) (2024-01-23)
+
+
+### Features
+
+* **polymorphic:** enabled polymorphic associations support by default ([#644](https://github.com/ForestAdmin/forest-rails/issues/644)) ([92853a9](https://github.com/ForestAdmin/forest-rails/commit/92853a91ed23b8834f85582aef8f24c6b12f3cb0))
+
+
+### BREAKING CHANGES
+
+* **polymorphic:** polymorphic association support enabled by default. It is no longer necessary to define the env variable ENABLE_SUPPORT_POLYMORPHISM
+
 # [8.1.0](https://github.com/ForestAdmin/forest-rails/compare/v8.0.17...v8.1.0) (2024-01-18)
 
 
diff --git a/Gemfile.lock b/Gemfile.lock
index 96e70eac..69938d39 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,7 +1,7 @@
 PATH
   remote: .
   specs:
-    forest_liana (8.1.0)
+    forest_liana (9.0.0-beta.1)
       arel-helpers
       bcrypt
       deepsort
diff --git a/lib/forest_liana/version.rb b/lib/forest_liana/version.rb
index 3329d49c..08c35804 100644
--- a/lib/forest_liana/version.rb
+++ b/lib/forest_liana/version.rb
@@ -1,3 +1,3 @@
 module ForestLiana
-  VERSION = "8.1.0"
+  VERSION = "9.0.0-beta.1"
 end
diff --git a/package.json b/package.json
index d43ec016..0aba6f26 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "forest-rails",
-  "version": "8.1.0",
+  "version": "9.0.0-beta.1",
   "description": "The official Rails liana for Forest.",
   "directories": {
     "test": "test"