diff --git a/packages/runtime-core/__tests__/__snapshots__/rendererPortal.spec.ts.snap b/packages/runtime-core/__tests__/__snapshots__/rendererPortal.spec.ts.snap
new file mode 100644
index 000000000..77d48c3cc
--- /dev/null
+++ b/packages/runtime-core/__tests__/__snapshots__/rendererPortal.spec.ts.snap
@@ -0,0 +1,23 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`renderer: portal should update children 1`] = `"<div>teleported</div>"`;
+
+exports[`renderer: portal should update children 2`] = `""`;
+
+exports[`renderer: portal should update children 3`] = `"teleported"`;
+
+exports[`renderer: portal should update target 1`] = `"<!----><!--[object Object]--><div>root</div><!---->"`;
+
+exports[`renderer: portal should update target 2`] = `"<div>teleported</div>"`;
+
+exports[`renderer: portal should update target 3`] = `""`;
+
+exports[`renderer: portal should update target 4`] = `"<!----><!--[object Object]--><div>root</div><!---->"`;
+
+exports[`renderer: portal should update target 5`] = `""`;
+
+exports[`renderer: portal should update target 6`] = `"<div>teleported</div>"`;
+
+exports[`renderer: portal should work 1`] = `"<!----><!--[object Object]--><div>root</div><!---->"`;
+
+exports[`renderer: portal should work 2`] = `"<div>teleported</div>"`;
diff --git a/packages/runtime-core/__tests__/rendererPortal.spec.ts b/packages/runtime-core/__tests__/rendererPortal.spec.ts
index 0f8a6911b..b6fb23b03 100644
--- a/packages/runtime-core/__tests__/rendererPortal.spec.ts
+++ b/packages/runtime-core/__tests__/rendererPortal.spec.ts
@@ -1,3 +1,84 @@
+import {
+  nodeOps,
+  serializeInner,
+  render,
+  h,
+  createComponent,
+  Portal,
+  Text,
+  Fragment,
+  ref,
+  nextTick,
+  TestElement,
+  TestNode
+} from '@vue/runtime-test'
+import { VNodeChildren } from '../src/vnode'
+
 describe('renderer: portal', () => {
-  test.todo('should work')
+  test('should work', () => {
+    const target = nodeOps.createElement('div')
+    const root = nodeOps.createElement('div')
+
+    const Comp = createComponent(() => () =>
+      h(Fragment, [
+        h(Portal, { target }, h('div', 'teleported')),
+        h('div', 'root')
+      ])
+    )
+    render(h(Comp), root)
+
+    expect(serializeInner(root)).toMatchSnapshot()
+    expect(serializeInner(target)).toMatchSnapshot()
+  })
+
+  test('should update target', async () => {
+    const targetA = nodeOps.createElement('div')
+    const targetB = nodeOps.createElement('div')
+    const target = ref(targetA)
+    const root = nodeOps.createElement('div')
+
+    const Comp = createComponent(() => () =>
+      h(Fragment, [
+        h(Portal, { target }, h('div', 'teleported')),
+        h('div', 'root')
+      ])
+    )
+    render(h(Comp), root)
+
+    expect(serializeInner(root)).toMatchSnapshot()
+    expect(serializeInner(targetA)).toMatchSnapshot()
+    expect(serializeInner(targetB)).toMatchSnapshot()
+
+    target.value = targetB
+    await nextTick()
+
+    expect(serializeInner(root)).toMatchSnapshot()
+    expect(serializeInner(targetA)).toMatchSnapshot()
+    expect(serializeInner(targetB)).toMatchSnapshot()
+  })
+
+  test('should update children', async () => {
+    const target = nodeOps.createElement('div')
+    const root = nodeOps.createElement('div')
+    const children = ref<VNodeChildren<TestNode, TestElement>>([
+      h('div', 'teleported')
+    ])
+
+    const Comp = createComponent(() => () =>
+      h(Portal, { target }, children.value)
+    )
+    render(h(Comp), root)
+
+    expect(serializeInner(target)).toMatchSnapshot()
+
+    children.value = []
+    await nextTick()
+
+    expect(serializeInner(target)).toMatchSnapshot()
+
+    children.value = [h(Text, 'teleported')]
+    await nextTick()
+
+    expect(serializeInner(target)).toMatchSnapshot()
+  })
 })
diff --git a/packages/runtime-core/src/renderer.ts b/packages/runtime-core/src/renderer.ts
index 1d73fd480..a6999e437 100644
--- a/packages/runtime-core/src/renderer.ts
+++ b/packages/runtime-core/src/renderer.ts
@@ -680,7 +680,11 @@ export function createRenderer<
     isSVG: boolean,
     optimized: boolean
   ) {
-    const targetSelector = n2.props && n2.props.target
+    let targetSelector = n2.props && n2.props.target
+    if (isRef(targetSelector)) {
+      targetSelector = targetSelector.value
+    }
+
     const { patchFlag, shapeFlag, children } = n2
     if (n1 == null) {
       const target = (n2.target = isString(targetSelector)
@@ -733,7 +737,7 @@ export function createRenderer<
       if (targetSelector !== (n1.props && n1.props.target)) {
         const nextTarget = (n2.target = isString(targetSelector)
           ? hostQuerySelector(targetSelector)
-          : null)
+          : targetSelector)
         if (nextTarget != null) {
           // move content
           if (shapeFlag & ShapeFlags.TEXT_CHILDREN) {