diff --git a/complex-types.d.ts b/complex-types.d.ts
index 6d0c058..0877550 100644
--- a/complex-types.d.ts
+++ b/complex-types.d.ts
@@ -24,3 +24,15 @@ declare module 'mdast' {
     mdxFlowExpression: MdxFlowExpression
   }
 }
+
+declare module 'hast' {
+  interface RootContentMap {
+    mdxTextExpression: MdxTextExpression
+    mdxFlowExpression: MdxFlowExpression
+  }
+
+  interface ElementContentMap {
+    mdxFlowExpression: MdxFlowExpression
+    mdxFlowExpression: MdxFlowExpression
+  }
+}
diff --git a/package.json b/package.json
index ade4477..111feb9 100644
--- a/package.json
+++ b/package.json
@@ -36,15 +36,17 @@
     "index.js"
   ],
   "dependencies": {
-    "@types/estree-jsx": "^0.0.1"
+    "@types/estree-jsx": "^0.0.1",
+    "@types/hast": "^2.0.0",
+    "@types/mdast": "^3.0.0",
+    "mdast-util-from-markdown": "^1.0.0",
+    "mdast-util-to-markdown": "^1.0.0"
   },
   "devDependencies": {
     "@types/acorn": "^4.0.0",
     "@types/tape": "^4.0.0",
     "acorn": "^8.0.0",
     "c8": "^7.0.0",
-    "mdast-util-from-markdown": "^1.0.0",
-    "mdast-util-to-markdown": "^1.0.0",
     "micromark-extension-mdx-expression": "^1.0.0",
     "prettier": "^2.0.0",
     "remark-cli": "^10.0.0",