diff --git a/.changeset/devtools-dependency-ranges.md b/.changeset/devtools-dependency-ranges.md
new file mode 100644
index 0000000..b4aed11
--- /dev/null
+++ b/.changeset/devtools-dependency-ranges.md
@@ -0,0 +1,7 @@
+---
+"@typeonce/effect-machine-devtools": patch
+---
+
+Install the devtools CLI without pinning a second exact TypeScript or Vite.
+
+`@typeonce/effect-machine-devtools` now depends on `typescript` `>=5.9.0 <7.0.0` and `vite` `^8.1.5` instead of exact versions, so a package manager can reuse compatible versions your project already has. No setup changes are required: the CLI still works when your project uses neither, or uses TypeScript 7.
diff --git a/packages/devtools/README.md b/packages/devtools/README.md
index 68dd49b..9d8a760 100644
--- a/packages/devtools/README.md
+++ b/packages/devtools/README.md
@@ -17,6 +17,8 @@ When pinning a release instead of using `latest`, use the same explicit version
 
 The current release requires Node.js 22.19 or newer and stable Effect `^4.0.0`.
 
+The CLI brings its own TypeScript parser and Vite server, so a project does not need to install either. They are regular dependencies with ranges (`typescript` `>=5.9.0 <7.0.0`, `vite` `^8.1.5`), so a package manager can reuse a compatible version the project already has. The project can use any TypeScript version, including TypeScript 7. Devtools only parses source files with the JavaScript compiler API, which TypeScript 7 does not ship, so it keeps its own 5.9–6.x copy in that case.
+
 ## Run the visualizer
 
 Start it from the project that contains the machines:
diff --git a/packages/devtools/package.json b/packages/devtools/package.json
index fbcef5e..3eb0752 100644
--- a/packages/devtools/package.json
+++ b/packages/devtools/package.json
@@ -38,8 +38,8 @@
     "@typeonce/effect-machine": "workspace:^",
     "chokidar": "4.0.3",
     "elkjs": "0.12.0",
-    "typescript": "6.0.3",
-    "vite": "8.1.5"
+    "typescript": ">=5.9.0 <7.0.0",
+    "vite": "^8.1.5"
   },
   "peerDependencies": {
     "effect": "^4.0.0"
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 33ecbac..3c19022 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -74,10 +74,10 @@ importers:
         specifier: 0.12.0
         version: 0.12.0
       typescript:
-        specifier: 6.0.3
+        specifier: '>=5.9.0 <7.0.0'
         version: 6.0.3
       vite:
-        specifier: 8.1.5
+        specifier: ^8.1.5
         version: 8.1.5(@types/node@25.7.0)(esbuild@0.27.7)(tsx@4.21.0)(yaml@2.9.0)
     devDependencies:
       '@types/node':