diff --git a/src/app/api/metrics/repos/route.ts b/src/app/api/metrics/repos/route.ts
index 11ef12f67..3d7759da1 100644
--- a/src/app/api/metrics/repos/route.ts
+++ b/src/app/api/metrics/repos/route.ts
@@ -238,7 +238,7 @@ export async function GET(req: NextRequest) {
   const daysParam = req.nextUrl.searchParams.get("days");
   const parsedDays = daysParam ? parseInt(daysParam, 10) : NaN;
   // Clamp days between 1 and 365 — GitHub Commit Search supports up to ~1 year lookback.
-  const days = isNaN(parsedDays) ? 30 : Math.max(1, Math.min(365, parsedDays));
+  const days = Number.isNaN(parsedDays) ? 30 : Math.max(1, Math.min(365, parsedDays));
   const accountId = req.nextUrl.searchParams.get("accountId");
   const bypass = isMetricsCacheBypassed(req);
 
diff --git a/src/app/api/milestones/route.ts b/src/app/api/milestones/route.ts
index 4019a3d7f..19ec9c30c 100644
--- a/src/app/api/milestones/route.ts
+++ b/src/app/api/milestones/route.ts
@@ -92,7 +92,7 @@ export async function POST(req: Request) {
       ? unit.trim().slice(0, MAX_UNIT_LEN)
       : "units";
 
-  if (typeof targetDate !== "string" || isNaN(new Date(targetDate).getTime())) {
+  if (typeof targetDate !== "string" || Number.isNaN(new Date(targetDate).getTime())) {
     return NextResponse.json({ error: "targetDate must be a valid date string" }, { status: 400 });
   }