diff --git a/lua/cp/cache.lua b/lua/cp/cache.lua
index 7ff1824..6d56228 100644
--- a/lua/cp/cache.lua
+++ b/lua/cp/cache.lua
@@ -56,8 +56,11 @@ function M.load()
   end
 
   if vim.fn.filereadable(cache_file) == 0 then
-    vim.fn.writefile({}, cache_file)
-    vim.fn.setfperm(cache_file, 'rw-------')
+    vim.fn.mkdir(vim.fn.fnamemodify(cache_file, ':h'), 'p')
+    local tmpfile = vim.fn.tempname()
+    vim.fn.writefile({}, tmpfile)
+    vim.fn.setfperm(tmpfile, 'rw-------')
+    vim.uv.fs_rename(tmpfile, cache_file)
     loaded = true
     return
   end
@@ -107,8 +110,10 @@ function M.save()
     cache_data._version = CACHE_VERSION
     local encoded = vim.json.encode(cache_data)
     local lines = vim.split(encoded, '\n')
-    vim.fn.writefile(lines, cache_file)
-    vim.fn.setfperm(cache_file, 'rw-------')
+    local tmpfile = vim.fn.tempname()
+    vim.fn.writefile(lines, tmpfile)
+    vim.fn.setfperm(tmpfile, 'rw-------')
+    vim.uv.fs_rename(tmpfile, cache_file)
   end)
 end
 
diff --git a/lua/cp/credentials.lua b/lua/cp/credentials.lua
index 4f22038..1d7e399 100644
--- a/lua/cp/credentials.lua
+++ b/lua/cp/credentials.lua
@@ -120,8 +120,10 @@ function M.logout(platform)
     local ok, data = pcall(vim.fn.json_decode, vim.fn.readfile(cookie_file, 'b'))
     if ok and type(data) == 'table' then
       data[platform] = nil
-      vim.fn.writefile({ vim.fn.json_encode(data) }, cookie_file)
-      vim.fn.setfperm(cookie_file, 'rw-------')
+      local tmpfile = vim.fn.tempname()
+      vim.fn.writefile({ vim.fn.json_encode(data) }, tmpfile)
+      vim.fn.setfperm(tmpfile, 'rw-------')
+      vim.uv.fs_rename(tmpfile, cookie_file)
     end
   end
   logger.log(display .. ' credentials cleared', { level = vim.log.levels.INFO, override = true })
diff --git a/scrapers/base.py b/scrapers/base.py
index e98990c..4d36206 100644
--- a/scrapers/base.py
+++ b/scrapers/base.py
@@ -3,6 +3,7 @@ import json
 import os
 import re
 import sys
+import tempfile
 from abc import ABC, abstractmethod
 from pathlib import Path
 from typing import Any
@@ -20,6 +21,18 @@ from .models import (
 _COOKIE_FILE = Path.home() / ".cache" / "cp-nvim" / "cookies.json"
 
 
+def _atomic_write(path: Path, content: str) -> None:
+    fd, tmp = tempfile.mkstemp(dir=path.parent, prefix=".tmp-")
+    try:
+        os.fchmod(fd, 0o600)
+        with os.fdopen(fd, "w") as f:
+            f.write(content)
+        os.replace(tmp, path)
+    except BaseException:
+        os.unlink(tmp)
+        raise
+
+
 def load_platform_cookies(platform: str) -> Any | None:
     try:
         data = json.loads(_COOKIE_FILE.read_text())
@@ -29,22 +42,20 @@ def load_platform_cookies(platform: str) -> Any | None:
 
 
 def save_platform_cookies(platform: str, data: Any) -> None:
-    _COOKIE_FILE.parent.mkdir(parents=True, exist_ok=True)
+    _COOKIE_FILE.parent.mkdir(parents=True, exist_ok=True, mode=0o700)
     try:
         existing = json.loads(_COOKIE_FILE.read_text())
     except Exception:
         existing = {}
     existing[platform] = data
-    _COOKIE_FILE.write_text(json.dumps(existing))
-    _COOKIE_FILE.chmod(0o600)
+    _atomic_write(_COOKIE_FILE, json.dumps(existing))
 
 
 def clear_platform_cookies(platform: str) -> None:
     try:
         existing = json.loads(_COOKIE_FILE.read_text())
         existing.pop(platform, None)
-        _COOKIE_FILE.write_text(json.dumps(existing))
-        _COOKIE_FILE.chmod(0o600)
+        _atomic_write(_COOKIE_FILE, json.dumps(existing))
     except Exception:
         pass