diff --git a/src/lib/stripe.ts b/src/lib/stripe.ts
index c2f27a5..30c001d 100644
--- a/src/lib/stripe.ts
+++ b/src/lib/stripe.ts
@@ -29,9 +29,13 @@
 import Stripe from "stripe";
 import type { Invoice } from "@/types";
 
-// Pinned API version. Bump deliberately, not via dependency update.
-// Keep this matched to the stripe-node major version in package.json.
-const STRIPE_API_VERSION = "2026-03-25.dahlia" as const;
+// Pinned API version. This is a string-literal type in the Stripe
+// SDK — the explicit `Stripe.LatestApiVersion` annotation forces a
+// compile error when the installed SDK ships with a different pin,
+// so a `npm update` that bumps Stripe to a new API version gets
+// caught here rather than at runtime. Bump this string deliberately
+// alongside the SDK upgrade and review the API changelog.
+const STRIPE_API_VERSION: Stripe.LatestApiVersion = "2026-04-22.dahlia";
 
 // Cache the client across hot reloads / serverless invocations.
 // We don't instantiate at module load because some build steps run