diff --git a/.github/workflows/github-action-acceptance.yaml b/.github/workflows/github-action-acceptance.yaml
index 3938af8..f028031 100644
--- a/.github/workflows/github-action-acceptance.yaml
+++ b/.github/workflows/github-action-acceptance.yaml
@@ -24,5 +24,5 @@ jobs:
         with:
           node-version: ${{ matrix.node-version }}
       - run: yarn
-      - run: yarn rescript:build
+      - run: yarn rescript:build:dev
       # - run: yarn test
diff --git a/package.json b/package.json
index 810da0d..c9a97e9 100644
--- a/package.json
+++ b/package.json
@@ -8,8 +8,9 @@
     "changelog": "yarn auto-changelog -p && git add HISTORY.md",
     "build": "yarn rescript:build",
     "rescript:clean": "yarn rescript clean",
-    "rescript:build": "yarn rescript build -with-deps",
-    "rescript:dev": "yarn rescript build -with-deps -w",
+    "rescript:build": "yarn rescript build",
+    "rescript:build:dev": "yarn rescript build --dev",
+    "rescript:dev": "yarn rescript watch --dev",
     "test": "yarn vitest --run --coverage --allow-only",
     "test:dev": "yarn vitest",
     "yalc:dev": "yarn rescript:dev & yarn nodemon -x \"yalc push\"",
@@ -35,7 +36,7 @@
     "rescript.json"
   ],
   "devDependencies": {
-    "@greenfinity/rescript-vitest": "^0.1.0",
+    "@greenfinity/rescript-vitest": "^0.2.0",
     "@react-email/components": "^0.3.1",
     "@rescript/react": "^0.14.0-rc.1",
     "@vitest/coverage-v8": "2.1.8",
@@ -43,17 +44,18 @@
     "nodemon": "^3.1.7",
     "react": "^19.0.0",
     "react-dom": "^19.0.0",
-    "rescript": "^11.1.0",
+    "rescript": "^12.0.0-beta.4",
     "vitest": "^2.1.8"
   },
   "peerDependencies": {
     "@react-email/components": "^0.3.1",
     "@rescript/react": "^0.14.0-rc.1",
     "react": "^19.0.0",
-    "react-dom": "^19.0.0"
+    "react-dom": "^19.0.0",
+    "rescript": "^12.0.0-beta.4"
   },
   "peerDevDependencies": {
-    "@greenfinity/rescript-vitest": "^0.1.0",
+    "@greenfinity/rescript-vitest": "^0.2.0",
     "@vitest/coverage-v8": "2.1.8",
     "vitest": "^2.1.8"
   },
diff --git a/rescript.json b/rescript.json
index 265b74a..39542b4 100644
--- a/rescript.json
+++ b/rescript.json
@@ -1,7 +1,7 @@
 {
   "name": "@greenfinity/rescript-react-email",
   "namespace": false,
-  "bsc-flags": ["-bs-no-version-header", "-bs-super-errors"],
+  "compiler-flags": ["-bs-no-version-header"],
   "suffix": ".bs.mjs",
   "package-specs": {
     "module": "esmodule",
@@ -16,5 +16,5 @@
     "number": "-44",
     "error": "+101"
   },
-  "bs-dependencies": ["@rescript/react"]
+  "dependencies": ["@rescript/react"]
 }
diff --git a/src/ReactEmail.res b/src/ReactEmail.res
index e5ed588..d352e23 100644
--- a/src/ReactEmail.res
+++ b/src/ReactEmail.res
@@ -38,7 +38,7 @@ module Tailwind = {
 }
 
 module Heading = {
-  type headingAs = @string [#h1 | #h2 | #h3 | #h4 | #h5 | #h6]
+  type headingAs = [#h1 | #h2 | #h3 | #h4 | #h5 | #h6]
   @react.component @module("@react-email/heading")
   external make: (
     ~id: string=?,
diff --git a/vitest.config.mjs b/vitest.config.mjs
index dcceb9b..65609e3 100644
--- a/vitest.config.mjs
+++ b/vitest.config.mjs
@@ -6,6 +6,7 @@ const projectRootPath = path.resolve(".");
 export default defineConfig({
   test: {
     include: ["**/__tests__/**/*_vitest.bs.mjs"],
+    exclude: ["**/lib/bs/**/*"],
     globals: true,
     reporters: "verbose",
     environment: "jsdom",
diff --git a/yarn.lock b/yarn.lock
index 462aa76..91da1f5 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -281,7 +281,7 @@ __metadata:
   version: 0.0.0-use.local
   resolution: "@greenfinity/rescript-react-email@workspace:."
   dependencies:
-    "@greenfinity/rescript-vitest": "npm:^0.1.0"
+    "@greenfinity/rescript-vitest": "npm:^0.2.0"
     "@react-email/components": "npm:^0.3.1"
     "@rescript/react": "npm:^0.14.0-rc.1"
     "@vitest/coverage-v8": "npm:2.1.8"
@@ -289,24 +289,27 @@ __metadata:
     nodemon: "npm:^3.1.7"
     react: "npm:^19.0.0"
     react-dom: "npm:^19.0.0"
-    rescript: "npm:^11.1.0"
+    rescript: "npm:^12.0.0-beta.4"
     vitest: "npm:^2.1.8"
   peerDependencies:
     "@react-email/components": ^0.3.1
     "@rescript/react": ^0.14.0-rc.1
     react: ^19.0.0
     react-dom: ^19.0.0
+    rescript: ^12.0.0-beta.4
   languageName: unknown
   linkType: soft
 
-"@greenfinity/rescript-vitest@npm:^0.1.0":
-  version: 0.1.2
-  resolution: "@greenfinity/rescript-vitest@npm:0.1.2"
+"@greenfinity/rescript-vitest@npm:^0.2.0":
+  version: 0.2.0
+  resolution: "@greenfinity/rescript-vitest@npm:0.2.0"
   dependencies:
     "@vitest/coverage-v8": "npm:^2.1.8"
     jsdom: "npm:^25.0.1"
     vitest: "npm:^2.1.8"
-  checksum: 10/20bdacc7ca0b0e53a4e46c2102291cc636517e2fbef011472fe4bdbf844340bd5ef7f46cb612e661e52de725fa451ae89721c2de2094890da3fa2c0714fb05c3
+  peerDependencies:
+    rescript: ^12.0.0-beta.4
+  checksum: 10/ed97513735fc1a936def1faf66a0b33372ff8af6cdeaeb0fcf7f88d7d6c4d7bca6620af14029c9add494d346aba7cc803184317d74344abf30debef72a9a41ab
   languageName: node
   linkType: hard
 
@@ -622,6 +625,34 @@ __metadata:
   languageName: node
   linkType: hard
 
+"@rescript/darwin-arm64@npm:12.0.0-beta.4":
+  version: 12.0.0-beta.4
+  resolution: "@rescript/darwin-arm64@npm:12.0.0-beta.4"
+  conditions: os=darwin & cpu=arm64
+  languageName: node
+  linkType: hard
+
+"@rescript/darwin-x64@npm:12.0.0-beta.4":
+  version: 12.0.0-beta.4
+  resolution: "@rescript/darwin-x64@npm:12.0.0-beta.4"
+  conditions: os=darwin & cpu=x64
+  languageName: node
+  linkType: hard
+
+"@rescript/linux-arm64@npm:12.0.0-beta.4":
+  version: 12.0.0-beta.4
+  resolution: "@rescript/linux-arm64@npm:12.0.0-beta.4"
+  conditions: os=linux & cpu=arm64
+  languageName: node
+  linkType: hard
+
+"@rescript/linux-x64@npm:12.0.0-beta.4":
+  version: 12.0.0-beta.4
+  resolution: "@rescript/linux-x64@npm:12.0.0-beta.4"
+  conditions: os=linux & cpu=x64
+  languageName: node
+  linkType: hard
+
 "@rescript/react@npm:^0.14.0-rc.1":
   version: 0.14.0-rc.1
   resolution: "@rescript/react@npm:0.14.0-rc.1"
@@ -632,6 +663,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"@rescript/win32-x64@npm:12.0.0-beta.4":
+  version: 12.0.0-beta.4
+  resolution: "@rescript/win32-x64@npm:12.0.0-beta.4"
+  conditions: os=win32 & cpu=x64
+  languageName: node
+  linkType: hard
+
 "@rollup/rollup-android-arm-eabi@npm:4.45.0":
   version: 4.45.0
   resolution: "@rollup/rollup-android-arm-eabi@npm:4.45.0"
@@ -2495,14 +2533,33 @@ __metadata:
   languageName: node
   linkType: hard
 
-"rescript@npm:^11.1.0":
-  version: 11.1.4
-  resolution: "rescript@npm:11.1.4"
+"rescript@npm:^12.0.0-beta.4":
+  version: 12.0.0-beta.4
+  resolution: "rescript@npm:12.0.0-beta.4"
+  dependencies:
+    "@rescript/darwin-arm64": "npm:12.0.0-beta.4"
+    "@rescript/darwin-x64": "npm:12.0.0-beta.4"
+    "@rescript/linux-arm64": "npm:12.0.0-beta.4"
+    "@rescript/linux-x64": "npm:12.0.0-beta.4"
+    "@rescript/win32-x64": "npm:12.0.0-beta.4"
+  dependenciesMeta:
+    "@rescript/darwin-arm64":
+      optional: true
+    "@rescript/darwin-x64":
+      optional: true
+    "@rescript/linux-arm64":
+      optional: true
+    "@rescript/linux-x64":
+      optional: true
+    "@rescript/win32-x64":
+      optional: true
   bin:
-    bsc: bsc
-    bstracing: lib/bstracing
-    rescript: rescript
-  checksum: 10/2ba71cf76e04000afb025afc245aef0d4c1647c73323f325bbc386f562df5a9fdddf137f6031ac7bb59c935c60174156d7a605a05a70adac8bd76dc0795aa6bd
+    bsc: cli/bsc.js
+    bstracing: cli/bstracing.js
+    rescript: cli/rescript.js
+    rescript-legacy: cli/rescript-legacy.js
+    rescript-tools: cli/rescript-tools.js
+  checksum: 10/2dbb8cbd28e774e5039d4bc2bb91b523c1fdf4ab5fedafcb8fa1ee3367044fba422ea67707265c01dc6782b86d2a14c63c34a5c5c2eb43bffb5f9f73505955a1
   languageName: node
   linkType: hard