diff --git a/src/pyob/dashboard_server.py b/src/pyob/dashboard_server.py
index 31bf959..a016810 100644
--- a/src/pyob/dashboard_server.py
+++ b/src/pyob/dashboard_server.py
@@ -74,7 +74,8 @@ def acknowledge_issue(issue_id):
                 "timestamp": datetime.now().isoformat(),
             }
 
-            # Save updated statuses
+        # Save updated statuses
+        with status_lock:  # Acquire lock before writing shared resource
             with open(status_file, "w", encoding="utf-8") as f:
                 json.dump(issue_statuses, f, indent=4)