diff --git a/openspec/changes/persistent-terminal-sessions/tasks.md b/openspec/changes/persistent-terminal-sessions/tasks.md
index 215140b..a234a6e 100644
--- a/openspec/changes/persistent-terminal-sessions/tasks.md
+++ b/openspec/changes/persistent-terminal-sessions/tasks.md
@@ -46,7 +46,7 @@
 - [x] 6.1 Add reconnection logic with exponential backoff
 - [x] 6.2 Handle buffer replay on reconnect (process incoming bytes)
 - [x] 6.3 Add reset function (send WebSocket message or call API)
-- [ ] 6.4 Add heartbeat/ping to detect disconnections faster
+- [x] 6.4 Add heartbeat/ping to detect disconnections faster
 
 ## 7. Testing