diff --git a/.changeset/fair-eyes-promise.md b/.changeset/fair-eyes-promise.md
new file mode 100644
index 000000000000..c66a42d17904
--- /dev/null
+++ b/.changeset/fair-eyes-promise.md
@@ -0,0 +1,7 @@
+---
+'@astrojs/mdx': major
+---
+
+Support Astro 3 JSX format
+
+This upgrades the MDX plugin to correctly work with the new JSX render API in Astro 3.