diff --git a/custom-node-list.json b/custom-node-list.json
index 85008c3b..9d5dcb0f 100644
--- a/custom-node-list.json
+++ b/custom-node-list.json
@@ -19,7 +19,7 @@
             "files": [
                 "https://github.com/ltdrdata/ComfyUI-Impact-Pack"
             ],
-            "pip": ["ultralytics"],
+            "pip": ["ultralytics==8.3.40"],
             "install_type": "git-clone",
             "description": "This extension offers various detector nodes and detailer nodes that allow you to configure a workflow that automatically enhances facial details. And provide iterative upscaler.",
             "preemptions":["SAMLoader"]
diff --git a/prestartup_script.py b/prestartup_script.py
index 8deb3a65..8bd19480 100644
--- a/prestartup_script.py
+++ b/prestartup_script.py
@@ -84,6 +84,7 @@ if os.path.exists(pip_overrides_path):
     with open(pip_overrides_path, 'r', encoding="UTF-8", errors="ignore") as json_file:
         cm_global.pip_overrides = json.load(json_file)
         cm_global.pip_overrides['numpy'] = 'numpy<2'
+        cm_global.pip_overrides['ultralytics'] = 'ultralytics==8.3.40'  # for security
 
 
 def remap_pip_package(pkg):