diff --git a/.changeset/three-kiwis-turn.md b/.changeset/three-kiwis-turn.md
new file mode 100644
index 0000000000..25b5e0497b
--- /dev/null
+++ b/.changeset/three-kiwis-turn.md
@@ -0,0 +1,17 @@
+---
+'@backstage/frontend-plugin-api': patch
+'@backstage/frontend-test-utils': patch
+---
+
+Deprecate the `.render` method of the `createExtensionTester` in favour of using `renderInTestApp` directly.
+
+```tsx
+import { renderInTestApp, createExtensionTester } from '@backstage/frontend-test-utils';
+
+const tester = createExtensionTester(extension);
+
+const { getByTestId } = renderInTestApp(tester.element());
+
+// or if you're not using `coreExtensionData.reactElement` as the output ref
+const { getByTestId } = renderInTestApp(tester.data(myComponentRef))'
+```