diff --git a/s03_permission/README.en.md b/s03_permission/README.en.md
index f2f78a454..06e46daed 100644
--- a/s03_permission/README.en.md
+++ b/s03_permission/README.en.md
@@ -65,7 +65,7 @@ PERMISSION_RULES = [
     },
     {
         "tools": ["bash"],
-        "check": lambda args: any(kw in args.get("command", "") for kw in ["rm ", "> /etc/", "chmod 777"]),
+        "check": lambda args: any(kw in args.get("command", "") for kw in ["rm ", "> /etc/", "chmod 777", "del"]),
         "message": "Potentially destructive command",
     },
 ]
diff --git a/s03_permission/README.ja.md b/s03_permission/README.ja.md
index 4008ed6eb..b84f87bac 100644
--- a/s03_permission/README.ja.md
+++ b/s03_permission/README.ja.md
@@ -65,7 +65,7 @@ PERMISSION_RULES = [
     },
     {
         "tools": ["bash"],
-        "check": lambda args: any(kw in args.get("command", "") for kw in ["rm ", "> /etc/", "chmod 777"]),
+        "check": lambda args: any(kw in args.get("command", "") for kw in ["rm ", "> /etc/", "chmod 777", "del"]),
         "message": "Potentially destructive command",
     },
 ]
diff --git a/s03_permission/README.md b/s03_permission/README.md
index 0c745664c..307bb46de 100644
--- a/s03_permission/README.md
+++ b/s03_permission/README.md
@@ -65,7 +65,7 @@ PERMISSION_RULES = [
     },
     {
         "tools": ["bash"],
-        "check": lambda args: any(kw in args.get("command", "") for kw in ["rm ", "> /etc/", "chmod 777"]),
+        "check": lambda args: any(kw in args.get("command", "") for kw in ["rm ", "> /etc/", "chmod 777", "del"]),
         "message": "Potentially destructive command",
     },
 ]
diff --git a/s03_permission/code.py b/s03_permission/code.py
index ba869c7db..5ccecf26c 100644
--- a/s03_permission/code.py
+++ b/s03_permission/code.py
@@ -161,7 +161,7 @@ def check_deny_list(command: str) -> str | None:
      "check": lambda args: not (WORKDIR / args.get("path", "")).resolve().is_relative_to(WORKDIR),
      "message": "Writing outside workspace"},
     {"tools": ["bash"],
-     "check": lambda args: any(kw in args.get("command", "") for kw in ["rm ", "> /etc/", "chmod 777"]),
+     "check": lambda args: any(kw in args.get("command", "") for kw in ["rm ", "> /etc/", "chmod 777", "del"]),
      "message": "Potentially destructive command"},
 ]