diff --git a/scripts/verify.ts b/scripts/verify.ts
index d2209d2..ef17275 100644
--- a/scripts/verify.ts
+++ b/scripts/verify.ts
@@ -18,7 +18,7 @@ const BASE = process.env.BASE ?? "http://localhost:3000";
 type CheckResult = {
   name: string;
   ok: boolean;
-  msg?: string;
+  msg?: string | undefined;
 };
 
 const results: CheckResult[] = [];
diff --git a/src/lib/og.tsx b/src/lib/og.tsx
index a18028b..82fbf68 100644
--- a/src/lib/og.tsx
+++ b/src/lib/og.tsx
@@ -6,8 +6,8 @@ export const OG_CONTENT_TYPE = "image/png";
 
 export function renderOgImage(props: {
   title: string;
-  description?: string;
-  eyebrow?: string;
+  description?: string | undefined;
+  eyebrow?: string | undefined;
 }) {
   return new ImageResponse(
     <OgCard
@@ -25,8 +25,8 @@ function OgCard({
   eyebrow
 }: {
   title: string;
-  description?: string;
-  eyebrow?: string;
+  description?: string | undefined;
+  eyebrow?: string | undefined;
 }) {
   return (
     <div
diff --git a/tsconfig.json b/tsconfig.json
index 230f450..8fc23a3 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -14,6 +14,7 @@
     "noUnusedLocals": true,
     "noUnusedParameters": true,
     "noUncheckedIndexedAccess": true,
+    "exactOptionalPropertyTypes": true,
     "resolveJsonModule": true,
     "isolatedModules": true,
     "jsx": "react-jsx",