diff --git a/src/app/config.ts b/src/app/config.ts
index 0a878c1f..000101ac 100644
--- a/src/app/config.ts
+++ b/src/app/config.ts
@@ -165,11 +165,30 @@ export const POSTGRES_SSL_ENABLED =
   process.env.DISABLE_POSTGRES_SSL === '1' ? false : true;
 
 // STORAGE: REDIS
-export const REDIS_URL = (
-  process.env.KV_URL ||
+
+/**
+ * Normalizes a Redis URL for use with @upstash/redis.
+ *
+ * The SDK requires an HTTPS REST URL, but some providers (e.g. Vercel KV)
+ * supply a native `rediss://` protocol URL. This converts `rediss://` to
+ * `https://` by extracting the hostname, so either format works.
+ */
+const normalizeRedisRestUrl = (url: string | undefined): string | undefined => {
+  if (!url || !url.startsWith('rediss://')) return url;
+  try {
+    return `https://${new URL(url).hostname}`;
+  } catch {
+    return url;
+  }
+};
+
+// Priority: REST API first (native https://, preferred by @upstash/redis),
+// then rediss:// KV_URL (auto-normalized), then custom fallbacks.
+export const REDIS_URL = normalizeRedisRestUrl(
   process.env.KV_REST_API_URL ||
   process.env.EXIF_KV_REST_API_URL ||
-  process.env.UPSTASH_REDIS_REST_URL
+  process.env.KV_URL ||
+  process.env.UPSTASH_REDIS_REST_URL,
 );
 export const REDIS_TOKEN = (
   process.env.KV_TOKEN ||