diff --git a/src/refresh.rs b/src/refresh.rs
index ed5901f..937face 100644
--- a/src/refresh.rs
+++ b/src/refresh.rs
@@ -2,7 +2,7 @@ use anyhow::anyhow;
 use clap::Parser;
 use std::{
     fs::File,
-    io::{Read, Write},
+    io::Read,
     path::{Path, PathBuf},
     time::SystemTime,
 };
@@ -25,6 +25,7 @@ pub fn main(cli: Cli) -> anyhow::Result<()> {
     let certs_obj_dir = certs_dir.with_added_extension(timestamp_ms());
     std::fs::create_dir(&certs_obj_dir)
         .map_err(|e| anyhow!("failed to create \"{}\": {e}", certs_obj_dir.display()))?;
+    let certs_obj_dir_guard = SwpDirGuard(certs_obj_dir.clone());
 
     let mut bundle_content = Vec::new();
 
@@ -45,14 +46,7 @@ pub fn main(cli: Cli) -> anyhow::Result<()> {
             bundle_content.push(b'\n');
 
             let copy_dst = certs_obj_dir.join(it.file_name());
-            let mut copy_dst_file = File::options()
-                .create(true)
-                .truncate(true)
-                .write(true)
-                .open(&copy_dst)
-                .map_err(|e| anyhow!("failed to open \"{}\": {e}", copy_dst.display()))?;
-            copy_dst_file
-                .write_all(&content)
+            std::fs::write(&copy_dst, &content)
                 .map_err(|e| anyhow!("failed to write \"{}\": {e}", copy_dst.display()))?;
         }
     }
@@ -80,9 +74,18 @@ pub fn main(cli: Cli) -> anyhow::Result<()> {
         _ = std::fs::remove_dir_all(&path);
     }
 
+    std::mem::forget(certs_obj_dir_guard);
     Ok(())
 }
 
+#[derive(Debug)]
+struct SwpDirGuard(PathBuf);
+impl Drop for SwpDirGuard {
+    fn drop(&mut self) {
+        _ = std::fs::remove_dir_all(&self.0);
+    }
+}
+
 fn read_file_limited(path: &Path, limit: u64) -> anyhow::Result<Vec<u8>> {
     let mut buf = Vec::with_capacity(limit as _);
     let file =