diff --git a/bump.ts b/bump.ts
new file mode 100644
index 000000000..7faf979a5
--- /dev/null
+++ b/bump.ts
@@ -0,0 +1,45 @@
+import { version } from './version.ts';
+
+const p = version.split('.').map(s => parseInt(s))
+const versions = [
+    `${p[0]}.${p[1]}.${p[2] + 1}`,
+    `${p[0]}.${p[1] + 1}.0`,
+    `${p[0] + 1}.0.0`,
+]
+
+async function ask(question: string = '', stdin = Deno.stdin, stdout = Deno.stdout) {
+    const buf = new Uint8Array(1024)
+    await stdout.write(new TextEncoder().encode(question))
+    const n = <number>await stdin.read(buf)
+    const answer = new TextDecoder().decode(buf.subarray(0, n))
+    return answer.trim()
+}
+
+async function run(...cmd: string[]) {
+    const p = Deno.run({
+        cmd,
+        stdout: 'piped',
+        stderr: 'piped'
+    })
+    Deno.stdout.write(await p.output())
+    Deno.stderr.write(await p.stderrOutput())
+    p.close()
+}
+
+async function main() {
+    const answer = await ask([...versions.map((v, i) => `${i + 1}. v${v}`), 'upgrade to: '].join('\n'))
+    const v = parseInt(answer)
+    if (!isNaN(v) && v > 0 && v <= 3) {
+        const up = versions[v - 1]
+        if (await ask('are you sure? (y/n) ') === 'y') {
+            await Deno.writeTextFile('./version.ts', `export const version = '${up}'\n`)
+            await run('git', 'add', '.', '--all')
+            await run('git', 'commit', '-m', `v${up}`)
+            await run('git', 'tag', `v${up}`)
+        }
+    }
+}
+
+if (import.meta.main) {
+    main()
+}
diff --git a/version.ts b/version.ts
index 08652fafd..f11a5bde6 100644
--- a/version.ts
+++ b/version.ts
@@ -1 +1 @@
-export const version = '0.1.9'
+export const version = '0.2.0'