diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 844d632..599af8a 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -78,6 +78,15 @@ jobs:
     steps:
       - uses: actions/checkout@v7
 
+      - name: Check lip.toml version
+        run: |
+          expected="${GITHUB_REF_NAME#v}"
+          declared="$(sed -n 's/^version = "\(.*\)"$/\1/p' lip.toml | head -n 1)"
+          if [ "$declared" != "$expected" ]; then
+            echo "lip.toml version $declared does not match tag $expected" >&2
+            exit 1
+          fi
+
       - id: extract-release-notes
         uses: ffurrer2/extract-release-notes@v3
 
diff --git a/CHANGELOG.md b/CHANGELOG.md
index ab17cdd..f72becd 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Changed
+
+- Moved the lip package definition from tooth.json to lip.toml (format 4); the default variant now installs the client build on the Bedrock client
+
 ## [0.18.0] - 2026-11-06
 
 ### Changed
diff --git a/lip.toml b/lip.toml
new file mode 100644
index 0000000..d719a1e
--- /dev/null
+++ b/lip.toml
@@ -0,0 +1,49 @@
+format = 4
+id = "github.com/LiteLDev/LeviOptimize"
+version = "0.18.0"
+
+[info]
+name = "LeviOptimize"
+description = "A performance optimization mod for Minecraft Bedrock Dedicated Server and the Bedrock client"
+tags = ["optimization"]
+logo = "https://raw.githubusercontent.com/LiteLDev/LeviOptimize/main/docs/logo.png"
+
+# The default variant installs the server build on a dedicated server and the client build on the
+# Bedrock client. The variant "client" is kept for LeviLauncher and for existing installs, which
+# use the identity github.com/LiteLDev/LeviOptimize#client.
+
+[[variants.""]]
+side = "server"
+platform = "win-x64"
+
+[variants."".deps]
+"github.com/LiteLDev/LeviLamina" = "26.60.*"
+
+[[variants."".assets]]
+type = "zip"
+urls = ["https://{{id}}/releases/download/v{{version}}/LeviOptimize-server-windows-x64.zip"]
+place = [{ src = "LeviOptimize/", dest = "mods/LeviOptimize/" }]
+
+[[variants.""]]
+side = "client"
+platform = "win-x64"
+
+[variants."".deps]
+"github.com/LiteLDev/LeviLamina#client" = "26.60.*"
+
+[[variants."".assets]]
+type = "zip"
+urls = ["https://{{id}}/releases/download/v{{version}}/LeviOptimize-client-windows-x64.zip"]
+place = [{ src = "LeviOptimize/", dest = "mods/LeviOptimize/" }]
+
+[[variants.client]]
+side = "client"
+platform = "win-x64"
+
+[variants.client.deps]
+"github.com/LiteLDev/LeviLamina#client" = "26.60.*"
+
+[[variants.client.assets]]
+type = "zip"
+urls = ["https://{{id}}/releases/download/v{{version}}/LeviOptimize-client-windows-x64.zip"]
+place = [{ src = "LeviOptimize/", dest = "mods/LeviOptimize/" }]
diff --git a/tooth.json b/tooth.json
deleted file mode 100644
index d467b97..0000000
--- a/tooth.json
+++ /dev/null
@@ -1,61 +0,0 @@
-{
-    "format_version": 3,
-    "format_uuid": "289f771f-2c9a-4d73-9f3f-8492495a924d",
-    "tooth": "github.com/LiteLDev/LeviOptimize",
-    "version": "0.18.0",
-    "info": {
-        "name": "LeviOptimize",
-        "description": "A performance optimization mod for Minecraft Bedrock Dedicated Server and the Bedrock client",
-        "tags": [
-            "platform:levilamina",
-            "type:mod",
-            "category:optimization"
-        ],
-        "avatar_url": ""
-    },
-    "variants": [
-        {
-            "platform": "win-x64",
-            "dependencies": {
-                "github.com/LiteLDev/LeviLamina": "26.60.*"
-            },
-            "assets": [
-                {
-                    "type": "zip",
-                    "urls": [
-                        "https://{{tooth}}/releases/download/v{{version}}/LeviOptimize-server-windows-x64.zip"
-                    ],
-                    "placements": [
-                        {
-                            "type": "dir",
-                            "src": "LeviOptimize/",
-                            "dest": "mods/LeviOptimize"
-                        }
-                    ]
-                }
-            ]
-        },
-        {
-            "label": "client",
-            "platform": "win-x64",
-            "dependencies": {
-                "github.com/LiteLDev/LeviLamina#client": "26.60.*"
-            },
-            "assets": [
-                {
-                    "type": "zip",
-                    "urls": [
-                        "https://{{tooth}}/releases/download/v{{version}}/LeviOptimize-client-windows-x64.zip"
-                    ],
-                    "placements": [
-                        {
-                            "type": "dir",
-                            "src": "LeviOptimize/",
-                            "dest": "mods/LeviOptimize"
-                        }
-                    ]
-                }
-            ]
-        }
-    ]
-}