diff --git a/.changeset/khaki-otters-return.md b/.changeset/khaki-otters-return.md
new file mode 100644
index 000000000000..279160b289e1
--- /dev/null
+++ b/.changeset/khaki-otters-return.md
@@ -0,0 +1,5 @@
+---
+"@astrojs/markdown-remark": major
+---
+
+Removes deprecated APIs, including `remarkShiki`, `remarkPrism`, `replaceCssVariables`, and several unused types`
diff --git a/packages/markdown/remark/src/types.ts b/packages/markdown/remark/src/types.ts
index b6a32b211bf2..5861f9e6f9c6 100644
--- a/packages/markdown/remark/src/types.ts
+++ b/packages/markdown/remark/src/types.ts
@@ -13,6 +13,10 @@ import type { VFile } from 'vfile';
 
 export type { Node } from 'unist';
 
+export type MarkdownAstroData = {
+	frontmatter: Record<string, any>;
+};
+
 export type RemarkPlugin<PluginParameters extends any[] = any[]> = unified.Plugin<
 	PluginParameters,
 	mdast.Root