diff --git a/.changeset/wise-icons-tell.md b/.changeset/wise-icons-tell.md
new file mode 100644
index 000000000..f2d915237
--- /dev/null
+++ b/.changeset/wise-icons-tell.md
@@ -0,0 +1,5 @@
+---
+'astro': patch
+---
+
+Bugfix: allow dynamic importing of rehype plugins
diff --git a/packages/astro/src/core/ssr/index.ts b/packages/astro/src/core/ssr/index.ts
index af9702c9b..499039a56 100644
--- a/packages/astro/src/core/ssr/index.ts
+++ b/packages/astro/src/core/ssr/index.ts
@@ -209,9 +209,14 @@ export async function render(renderers: Renderer[], mod: ComponentInstance, ssrO
             renderOpts = mdRender[1];
             mdRender = mdRender[0];
           }
+          // ['rehype-toc', opts]
           if (typeof mdRender === 'string') {
             ({ default: mdRender } = await import(mdRender));
           }
+          // [import('rehype-toc'), opts]
+          else if (mdRender instanceof Promise) {
+            ({ default: mdRender } = await mdRender);
+          }
           const { code } = await mdRender(content, { ...renderOpts, ...(opts ?? {}) });
           return code;
         },
diff --git a/packages/astro/test/astro-markdown-plugins.test.js b/packages/astro/test/astro-markdown-plugins.test.js
index eab3f35a6..d3f20b073 100644
--- a/packages/astro/test/astro-markdown-plugins.test.js
+++ b/packages/astro/test/astro-markdown-plugins.test.js
@@ -15,7 +15,7 @@ describe('Astro Markdown plugins', () => {
           markdownRemark,
           {
             remarkPlugins: ['remark-code-titles', ['rehype-autolink-headings', { behavior: 'prepend' }]],
-            rehypePlugins: [['rehype-toc', { headings: ['h2', 'h3'] }], ['rehype-add-classes', { 'h1,h2,h3': 'title' }], 'rehype-slug'],
+            rehypePlugins: [[import('rehype-toc'), { headings: ['h2', 'h3'] }], ['rehype-add-classes', { 'h1,h2,h3': 'title' }], 'rehype-slug'],
           },
         ],
       },