diff --git a/package-lock.json b/package-lock.json
index 0f308e4..6d329fa 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -6572,6 +6572,12 @@
       "integrity": "sha1-Gmo16s5AEoDH8G3d7DUWWrJ+PlM=",
       "dev": true
     },
+    "lodash.isequal": {
+      "version": "4.5.0",
+      "resolved": "https://registry.npmjs.org/lodash.isequal/-/lodash.isequal-4.5.0.tgz",
+      "integrity": "sha1-QVxEePK8wwEgwizhDtMib30+GOA=",
+      "dev": true
+    },
     "lodash.memoize": {
       "version": "4.1.2",
       "resolved": "https://registry.npmjs.org/lodash.memoize/-/lodash.memoize-4.1.2.tgz",
@@ -7627,6 +7633,18 @@
         "object-keys": "^1.0.11"
       }
     },
+    "object.entries": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/object.entries/-/object.entries-1.1.0.tgz",
+      "integrity": "sha512-l+H6EQ8qzGRxbkHOd5I/aHRhHDKoQXQ8g0BYt4uSweQU1/J6dZUOyWh9a2Vky35YCKjzmgxOzta2hH6kf9HuXA==",
+      "dev": true,
+      "requires": {
+        "define-properties": "^1.1.3",
+        "es-abstract": "^1.12.0",
+        "function-bind": "^1.1.1",
+        "has": "^1.0.3"
+      }
+    },
     "object.getownpropertydescriptors": {
       "version": "2.0.3",
       "resolved": "https://registry.npmjs.org/object.getownpropertydescriptors/-/object.getownpropertydescriptors-2.0.3.tgz",
@@ -9141,6 +9159,17 @@
         "preact-render-to-string": "^3.2.0"
       }
     },
+    "preact-render-spy": {
+      "version": "1.2.1",
+      "resolved": "https://registry.npmjs.org/preact-render-spy/-/preact-render-spy-1.2.1.tgz",
+      "integrity": "sha1-X0EByPFfORYtt9J0Iwk1z7Pwf1w=",
+      "dev": true,
+      "requires": {
+        "lodash.isequal": "^4.5.0",
+        "object.entries": "^1.0.4",
+        "preact-render-to-string": "^3.6.3"
+      }
+    },
     "preact-render-to-string": {
       "version": "3.8.2",
       "resolved": "https://registry.npmjs.org/preact-render-to-string/-/preact-render-to-string-3.8.2.tgz",
diff --git a/package.json b/package.json
index 5c64362..8384aa1 100644
--- a/package.json
+++ b/package.json
@@ -55,6 +55,7 @@
     "npm-run-all": "^4.1.5",
     "preact": "^8.4.2",
     "preact-jsx-chai": "^2.2.1",
+    "preact-render-spy": "1.2.1",
     "rollup": "^1.16.7",
     "sinon": "^7.3.2",
     "sinon-chai": "^3.3.0",
diff --git a/src/index.js b/src/index.js
index 725e804..dade5bb 100644
--- a/src/index.js
+++ b/src/index.js
@@ -8,8 +8,16 @@ export default class Markup extends Component {
 		customReviver = h;
 	}
 
-	shouldComponentUpdate({ wrap, type, markup }) {
-		let p = this.props;
+	shouldComponentUpdate({ wrap, type, markup, components }) {
+		const p = this.props;
+		if (Object.keys(components).join()!==Object.keys(p.components).join()) {
+			return true;
+		}
+		for (let i in Object(components)) {
+			if (components[i]!==p.components[i]) {
+				return true;
+			}
+		}
 		return wrap!==p.wrap || type!==p.type || markup!==p.markup;
 	}
 
diff --git a/test/index.js b/test/index.js
index 45f5d3b..fa74d51 100644
--- a/test/index.js
+++ b/test/index.js
@@ -1,4 +1,5 @@
 import { h, render, rerender, Component } from 'preact';
+import deep from 'preact-render-spy';
 import assertJsx from 'preact-jsx-chai';
 import sinonChai from 'sinon-chai';
 chai.use(assertJsx);
@@ -200,6 +201,34 @@ describe('Markup', () => {
 		);
 	});
 
+	it('should update when mapped components change', () => {
+		const XFoo = () =>
+			(<div class="x-foo">hello foo</div>);
+		const XBar = () =>
+			(<div class="x-bar">hello bar</div>);
+
+		let context = deep(
+			<Markup type="html" markup='<x-component />' components={{ XComponent: XFoo }} />,
+			{ depth: Infinity }
+		);
+
+		expect(context.output()).to.eql(
+			<div class="markup">
+				<div class="x-foo">hello foo</div>
+			</div>
+		);
+
+		context.render(
+			<Markup type="html" markup='<x-component />' components={{ XComponent: XBar }} />
+		);
+
+		expect(context.output()).to.eql(
+			<div class="markup">
+				<div class="x-bar">hello bar</div>
+			</div>
+		);
+	});
+
 	describe('allow-scripts option', () => {
 		before( () => {
 			window.stub = sinon.stub();