diff --git a/src/services/readingPositionService.ts b/src/services/readingPositionService.ts
index a3383d7f..3deb8fee 100644
--- a/src/services/readingPositionService.ts
+++ b/src/services/readingPositionService.ts
@@ -19,7 +19,6 @@ export interface ReadingProgressContent {
   progress: number // 0-1 scroll progress
   ts?: number // Unix timestamp (optional, for display)
   loc?: number // Optional: pixel position
-  ver?: string // Schema version
 }
 
 // Helper to extract and parse reading progress from event (kind 39802)
@@ -117,8 +116,7 @@ export async function saveReadingPosition(
   const progressContent: ReadingProgressContent = {
     progress: position.position,
     ts: position.timestamp,
-    loc: position.scrollTop,
-    ver: '1'
+    loc: position.scrollTop
   }
   
   const tags = generateProgressTags(articleIdentifier)
diff --git a/src/services/readingProgressController.ts b/src/services/readingProgressController.ts
index 3d0af404..c3570e6d 100644
--- a/src/services/readingProgressController.ts
+++ b/src/services/readingProgressController.ts
@@ -13,7 +13,7 @@ type ProgressMapCallback = (progressMap: Map<string, number>) => void
 type LoadingCallback = (loading: boolean) => void
 
 const LAST_SYNCED_KEY = 'reading_progress_last_synced'
-const PROGRESS_CACHE_KEY = 'reading_progress_cache_v1'
+const PROGRESS_CACHE_KEY = 'reading_progress_cache'
 
 /**
  * Shared reading progress controller