diff --git a/src/server/activitypub.ts b/src/server/activitypub.ts
index 888feb08c..0d4e24485 100644
--- a/src/server/activitypub.ts
+++ b/src/server/activitypub.ts
@@ -76,7 +76,7 @@ router.get('/notes/:note', async (ctx, next) => {
 	}
 
 	ctx.body = pack(await renderNote(note, false));
-	ctx.set('Cache-Control', 'public, max-age=180');
+	ctx.set('Cache-Control', 'private, max-age=0, must-revalidate');
 	setResponseType(ctx);
 });
 
diff --git a/src/server/web/index.ts b/src/server/web/index.ts
index 616aaa36b..42292cd39 100644
--- a/src/server/web/index.ts
+++ b/src/server/web/index.ts
@@ -111,7 +111,7 @@ router.get('/notes/:note', async ctx => {
 			note: _note,
 			summary: getNoteSummary(_note)
 		});
-		ctx.set('Cache-Control', 'public, max-age=180');
+		ctx.set('Cache-Control', 'private, max-age=0, must-revalidate');
 	} else {
 		ctx.status = 404;
 	}