diff --git a/Cargo.lock b/Cargo.lock
index 271d564..99dae68 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -366,7 +366,7 @@ dependencies = [
 
 [[package]]
 name = "card-cli"
-version = "1.3.2"
+version = "1.3.3"
 dependencies = [
  "authenticator",
  "base64 0.13.0",
@@ -374,7 +374,6 @@ dependencies = [
  "clap",
  "digest 0.10.3",
  "hex",
- "lazy_static",
  "openpgp-card",
  "openpgp-card-pcsc",
  "openpgp-card-sequoia",
diff --git a/Cargo.toml b/Cargo.toml
index ccc9bac..f49e173 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "card-cli"
-version = "1.3.2"
+version = "1.3.3"
 authors = ["Hatter Jiang <jht5945@gmail.com>"]
 edition = "2018"
 
@@ -31,6 +31,6 @@ yubico_manager = "0.9"
 x509 = "0.2"
 x509-parser = "0.13"
 ssh-agent = { version = "0.2.3", features = ["agent"] }
-lazy_static = "1.4.0"
+#lazy_static = "1.4.0"
 #ssh-key = "0.4.0"
 #ctap-hid-fido2 = "2.1.3"
diff --git a/src/cmd_sshagent.rs b/src/cmd_sshagent.rs
index 4018225..7054d00 100644
--- a/src/cmd_sshagent.rs
+++ b/src/cmd_sshagent.rs
@@ -16,13 +16,10 @@ use ssh_agent::proto::message::{self, Message};
 use ssh_agent::proto::public_key::PublicKey;
 
 use crate::digest::{copy_sha256, copy_sha512};
-use crate::sshutil::with_sign;
-
-lazy_static! {
-    static ref CARD: Mutex<Option<PcscBackend>> = Mutex::new(None);
-}
+use crate::sshutil::{generate_ssh_string, with_sign};
 
 struct SshAgent {
+    card: Mutex<PcscBackend>,
     use_sign: bool,
     pin: String,
     public_key: PublicKey,
@@ -54,13 +51,10 @@ impl SshAgent {
                 n: with_sign(n.to_vec()),
             });
             let comment = format!("pgp-card:{}:{}", iff!(use_sign, "sign", "auth"), serial);
-            (public_key, comment.clone(), crate::sshutil::generate_ssh_string(e, n, &comment))
+            (public_key, comment.clone(), generate_ssh_string(e, n, &comment))
         };
-        {
-            let mut card_mutex = CARD.lock().unwrap();
-            *card_mutex = Some(card);
-        }
         Ok(Self {
+            card: Mutex::new(card),
             use_sign,
             pin,
             public_key,
@@ -104,12 +98,8 @@ impl SshAgent {
                 };
 
                 information!("SSH request, algorithm: {}", algorithm);
-                let mut card_mutex = CARD.lock().unwrap();
-                let card_mut = match card_mutex.as_mut() {
-                    Some(card) => card,
-                    None => return Err(From::from("Illegal card status: none")),
-                };
-                let mut pgp = OpenPgp::new(card_mut);
+                let mut card_mut = self.card.lock().unwrap();
+                let mut pgp = OpenPgp::new(&mut *card_mut);
                 let mut trans = opt_result!(pgp.transaction(), "Open card failed: {}");
                 let sig = if self.use_sign {
                     debugging!("User pin verify for pw1 sign, use sign: {}", self.use_sign);
diff --git a/src/main.rs b/src/main.rs
index ae29f35..da415de 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,7 +1,5 @@
 #[macro_use]
 extern crate rust_util;
-#[macro_use]
-extern crate lazy_static;
 
 use clap::{App, AppSettings, ArgMatches};
 use rust_util::util_clap::{Command, CommandError};