diff --git a/.changeset/blue-countries-beg.md b/.changeset/blue-countries-beg.md
new file mode 100644
index 0000000000..b1cbdaeb65
--- /dev/null
+++ b/.changeset/blue-countries-beg.md
@@ -0,0 +1,5 @@
+---
+"@gitbook/expr": patch
+---
+
+Add dev script for @gitbook/expr
diff --git a/package.json b/package.json
index 36f4634955..eb42309dc7 100644
--- a/package.json
+++ b/package.json
@@ -16,7 +16,7 @@
     },
     "private": true,
     "scripts": {
-        "dev": "turbo run dev",
+        "dev": "turbo run dev --concurrency 20",
         "build": "turbo run build",
         "clean-deps": "rm -rf node_modules && rm -rf packages/*/node_modules",
         "typecheck": "turbo run typecheck",
diff --git a/packages/expr/package.json b/packages/expr/package.json
index a7a1471d1a..71197e3c8a 100644
--- a/packages/expr/package.json
+++ b/packages/expr/package.json
@@ -31,7 +31,8 @@
         "build": "tsdown --project tsconfig.build.json",
         "typecheck": "tsc --noEmit",
         "unit": "bun test",
-        "clean": "rm -rf ./dist"
+        "clean": "rm -rf ./dist",
+        "dev": "bun run build -- --watch"
     },
     "files": ["dist", "README.md", "CHANGELOG.md"]
 }