diff --git a/phases/cpp-object-oriented-modular-refactoring/index.json b/phases/cpp-object-oriented-modular-refactoring/index.json
index cc65e36..d7a0e6a 100644
--- a/phases/cpp-object-oriented-modular-refactoring/index.json
+++ b/phases/cpp-object-oriented-modular-refactoring/index.json
@@ -203,5 +203,6 @@
       "completed_at": "2026-08-16T13:54:51+0900"
     }
   ],
-  "created_at": "2026-08-16T02:57:41+0900"
+  "created_at": "2026-08-16T02:57:41+0900",
+  "completed_at": "2026-08-16T13:54:51+0900"
 }
\ No newline at end of file
diff --git a/phases/index.json b/phases/index.json
index 22ae3e8..158cbc8 100644
--- a/phases/index.json
+++ b/phases/index.json
@@ -11,7 +11,8 @@
     },
     {
       "dir": "cpp-object-oriented-modular-refactoring",
-      "status": "pending"
+      "status": "completed",
+      "completed_at": "2026-08-16T13:54:51+0900"
     }
   ]
-}
+}
\ No newline at end of file