diff --git a/yama_wormfile_sftp/src/lib.rs b/yama_wormfile_sftp/src/lib.rs
index 550e240..95c1401 100644
--- a/yama_wormfile_sftp/src/lib.rs
+++ b/yama_wormfile_sftp/src/lib.rs
@@ -2,7 +2,7 @@ extern crate core;
 
 use async_trait::async_trait;
 use eyre::{bail, Context as EyreContext, ContextCompat};
-use openssh::{KnownHosts, RemoteChild, Session, Stdio};
+use openssh::{KnownHosts, RemoteChild, Session, SessionBuilder, Stdio};
 use openssh_sftp_client::error::SftpErrorKind;
 use openssh_sftp_client::file::{File, TokioCompatFile};
 use openssh_sftp_client::fs::{DirEntry, Fs};
@@ -55,7 +55,12 @@ struct SftpConn {
 impl SftpConn {
     pub async fn create(ssh_connect: &str, root_dir: impl Into<PathBuf>) -> eyre::Result<Self> {
         let root_dir = root_dir.into();
-        let session = Session::connect(ssh_connect, KnownHosts::Strict).await?;
+        let mut session_builder = SessionBuilder::default();
+        if let Ok(ssh_key_path) = std::env::var("YAMA_SSH_KEY") {
+            session_builder.keyfile(&ssh_key_path);
+        }
+        session_builder.known_hosts_check(KnownHosts::Add);
+        let session = session_builder.connect(ssh_connect).await?;
 
         let res = SftpConnAsyncTryBuilder {
             ssh: session,