diff --git a/.changeset/lucky-flowers-wonder.md b/.changeset/lucky-flowers-wonder.md
new file mode 100644
index 000000000000..ce94336576d5
--- /dev/null
+++ b/.changeset/lucky-flowers-wonder.md
@@ -0,0 +1,5 @@
+---
+"@astrojs/mdx": patch
+---
+
+Update to `es-module-lexer@1.1.1`
diff --git a/packages/integrations/mdx/CHANGELOG.md b/packages/integrations/mdx/CHANGELOG.md
index 074162dc2f7f..59d299960f54 100644
--- a/packages/integrations/mdx/CHANGELOG.md
+++ b/packages/integrations/mdx/CHANGELOG.md
@@ -1,5 +1,9 @@
 # @astrojs/mdx
 
+## 0.17.1
+
+- Updated to es-module-lexer@1.1.1
+
 ## 0.17.0
 
 ### Minor Changes
diff --git a/packages/integrations/mdx/package.json b/packages/integrations/mdx/package.json
index 5d69781a8bb5..1e526bbc5b0e 100644
--- a/packages/integrations/mdx/package.json
+++ b/packages/integrations/mdx/package.json
@@ -1,7 +1,7 @@
 {
   "name": "@astrojs/mdx",
   "description": "Use MDX within Astro",
-  "version": "0.17.0",
+  "version": "0.17.1",
   "type": "module",
   "types": "./dist/index.d.ts",
   "author": "withastro",
@@ -35,7 +35,7 @@
     "@mdx-js/mdx": "^2.3.0",
     "@mdx-js/rollup": "^2.3.0",
     "acorn": "^8.8.0",
-    "es-module-lexer": "^0.10.5",
+    "es-module-lexer": "^1.1.1",
     "estree-util-visit": "^1.2.0",
     "github-slugger": "^1.4.0",
     "gray-matter": "^4.0.3",
diff --git a/packages/integrations/mdx/src/index.ts b/packages/integrations/mdx/src/index.ts
index 7012849a4921..ecd7b7b43f79 100644
--- a/packages/integrations/mdx/src/index.ts
+++ b/packages/integrations/mdx/src/index.ts
@@ -112,13 +112,13 @@ export default function mdx(partialMdxOptions: Partial<MdxOptions> = {}): AstroI
 									}
 
 									const { fileUrl, fileId } = getFileInfo(id, config);
-									if (!moduleExports.includes('url')) {
+									if (!moduleExports.find(({n}) => n === 'url')) {
 										code += `\nexport const url = ${JSON.stringify(fileUrl)};`;
 									}
-									if (!moduleExports.includes('file')) {
+									if (!moduleExports.find(({n}) => n === 'file')) {
 										code += `\nexport const file = ${JSON.stringify(fileId)};`;
 									}
-									if (!moduleExports.includes('Content')) {
+									if (!moduleExports.find(({n}) => n === 'Content')) {
 										// Make `Content` the default export so we can wrap `MDXContent` and pass in `Fragment`
 										code = code.replace('export default MDXContent;', '');
 										code += `\nexport const Content = (props = {}) => MDXContent({
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index a53c5b009cf5..c4b46873854a 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -2901,7 +2901,7 @@ importers:
       astro-scripts: workspace:*
       chai: ^4.3.6
       cheerio: ^1.0.0-rc.11
-      es-module-lexer: ^0.10.5
+      es-module-lexer: ^1.1.1
       estree-util-visit: ^1.2.0
       github-slugger: ^1.4.0
       gray-matter: ^4.0.3
@@ -2929,7 +2929,7 @@ importers:
       '@mdx-js/mdx': 2.3.0
       '@mdx-js/rollup': 2.3.0
       acorn: 8.8.2
-      es-module-lexer: 0.10.5
+      es-module-lexer: 1.1.1
       estree-util-visit: 1.2.1
       github-slugger: 1.5.0
       gray-matter: 4.0.3
@@ -9296,10 +9296,6 @@ packages:
       unbox-primitive: 1.0.2
       which-typed-array: 1.1.9
 
-  /es-module-lexer/0.10.5:
-    resolution: {integrity: sha512-+7IwY/kiGAacQfY+YBhKMvEmyAJnw5grTUgjG85Pe7vcUI/6b7pZjZG8nQ7+48YhzEAEqrEgD2dCz/JIK+AYvw==}
-    dev: false
-
   /es-module-lexer/1.1.1:
     resolution: {integrity: sha512-n3ruqU8Te7I5prBd6d0darM8ajFuVNhLWvgo04hN7goWSaSrxe7ENOZitac7akN0A2o+8fMomBDsNPvW/eE3CQ==}
     dev: false