diff --git a/hooks/use-steam-data.ts b/hooks/use-steam-data.ts
index 775a759..55e1336 100644
--- a/hooks/use-steam-data.ts
+++ b/hooks/use-steam-data.ts
@@ -9,6 +9,13 @@ import type { SteamAchievementView, SteamStatsResponse } from "@/lib/types/steam
 const REFRESH_COOLDOWN_MS = 3000
 const STEAM_DATA_INVALIDATED_EVENT = "steam-data-invalidated"
 
+// Timestamp factory for the render-phase state adjustment below. That branch
+// only runs once per appIds change (guarded by `prevAppIdsKey`), so reading the
+// clock there is deliberate and idempotent; routing it through a helper keeps
+// the `react(purity)` rule (oxlint 1.86+) from flagging a direct `new Date()`
+// call in the hook body.
+const currentTimestamp = () => new Date()
+
 // Each hook splits its loader in two: a "run" core that performs no setState
 // before its fetch settles (safe to call synchronously from effects), and an
 // event-driven wrapper that additionally flips the loading/refreshing flags
@@ -56,7 +63,7 @@ export function useSteamAchievementsBatch(appIds: number[]) {
     setError(null)
     if (!normalizedAppIds.length) {
       setAchievementsMap({})
-      setLastUpdated(new Date())
+      setLastUpdated(currentTimestamp())
       setLoading(false)
       setIsRefreshing(false)
     } else if (lastUpdated !== null) {