diff --git a/Cargo.lock b/Cargo.lock
index cb6c6fe..a9db304 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -463,6 +463,26 @@ dependencies = [
  "memchr",
 ]
 
+[[package]]
+name = "const_format"
+version = "0.2.32"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e3a214c7af3d04997541b18d432afaff4c455e79e2029079647e72fc2bd27673"
+dependencies = [
+ "const_format_proc_macros",
+]
+
+[[package]]
+name = "const_format_proc_macros"
+version = "0.2.32"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c7f6ff08fd20f4f299298a28e2dfa8a8ba1036e6cd2460ac1de7b425d76f2500"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "unicode-xid",
+]
+
 [[package]]
 name = "core-foundation"
 version = "0.9.4"
@@ -1756,6 +1776,7 @@ dependencies = [
  "bytes",
  "chrono",
  "clap",
+ "const_format",
  "cpufeatures",
  "filesize",
  "filetime",
@@ -1768,7 +1789,6 @@ dependencies = [
  "inquire",
  "log",
  "mime",
- "once_cell",
  "openssl",
  "openssl-src",
  "parking_lot",
@@ -3558,6 +3578,12 @@ version = "0.1.11"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e51733f11c9c4f72aa0c160008246859e340b00807569a0da0e7a1079b27ba85"
 
+[[package]]
+name = "unicode-xid"
+version = "0.2.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f962df74c8c05a667b5ee8bcf162993134c104e96440b663c8daa176dc772d8c"
+
 [[package]]
 name = "untrusted"
 version = "0.9.0"
diff --git a/Cargo.toml b/Cargo.toml
index fc6f350..545dc18 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -11,6 +11,7 @@ axum = { version = "0.7", default-features = false, features = ["http1", "matche
 bytes = "1.5"
 chrono = "0.4"
 clap = { version = "4.5", features = ["derive", "wrap_help"] }
+const_format = "0.2.32"
 filesize = "0.2"
 filetime = "0.2"
 futures = "0.3"
@@ -22,7 +23,6 @@ hyper-util = { version = "0.1", features = ["tokio"] }
 inquire = "0.7"
 log = { version = "0.4", features = ["std"] }
 mime = "0.3"
-once_cell = "1.19"
 openssl = { version = "*", features = ["vendored"] }
 parking_lot = { version = "0.12", features = ["hardware-lock-elision", "deadlock_detection"] }
 pin-project-lite = "0.2"
diff --git a/src/gallery_downloader.rs b/src/gallery_downloader.rs
index 33b8a37..172fe2d 100644
--- a/src/gallery_downloader.rs
+++ b/src/gallery_downloader.rs
@@ -23,7 +23,7 @@ use crate::{error::Error, rpc::RPCClient, util};
 
 type BoxError = Box<dyn std::error::Error + Send + Sync>;
 
-static MAX_DOWNLOAD_TASK: u32 = 4;
+const MAX_DOWNLOAD_TASK: u32 = 4;
 
 pub struct GalleryDownloader {
     client: Arc<RPCClient>,
diff --git a/src/main.rs b/src/main.rs
index be31927..b14c272 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -52,9 +52,9 @@ static ALLOC: tikv_jemallocator::Jemalloc = tikv_jemallocator::Jemalloc;
 #[no_mangle]
 pub static mut malloc_conf: *const u8 = b"percpu_arena:phycpu,tcache:false,dirty_decay_ms:1000,muzzy_decay_ms:0\0".as_ptr();
 
-static VERSION : &str = concat!(env!("CARGO_PKG_VERSION"), "-", env!("VERGEN_GIT_SHA"));
-pub static CLIENT_VERSION: &str = "1.6.2";
-static MAX_KEY_TIME_DRIFT: RangeInclusive<i64> = -300..=300;
+const VERSION: &str = concat!(env!("CARGO_PKG_VERSION"), "-", env!("VERGEN_GIT_SHA"));
+pub const CLIENT_VERSION: &str = "1.6.2";
+const MAX_KEY_TIME_DRIFT: RangeInclusive<i64> = -300..=300;
 
 #[derive(Parser)]
 #[command(version = VERSION)]
diff --git a/src/middleware/mod.rs b/src/middleware/mod.rs
index 41f1c33..cffdbba 100644
--- a/src/middleware/mod.rs
+++ b/src/middleware/mod.rs
@@ -13,7 +13,7 @@ use axum::{
     response::Response,
     Router,
 };
-use once_cell::sync::Lazy;
+use const_format::concatcp;
 use tower::{timeout::TimeoutLayer, ServiceBuilder};
 
 use crate::{AppState, CLIENT_VERSION};
@@ -21,8 +21,7 @@ use crate::{AppState, CLIENT_VERSION};
 use self::connection_counter::ConnectionCounter;
 use self::logger::Logger;
 
-static SERVER_HEADER: Lazy<HeaderValue> =
-    Lazy::new(|| HeaderValue::from_maybe_shared(format!("Genetic Lifeform and Distributed Open Server {CLIENT_VERSION}")).unwrap());
+static SERVER_HEADER: HeaderValue = HeaderValue::from_static(concatcp!("Genetic Lifeform and Distributed Open Server ", CLIENT_VERSION));
 
 pub fn register_layer(router: Router<Arc<AppState>>, data: &AppState) -> Router<Arc<AppState>> {
     router
diff --git a/src/util.rs b/src/util.rs
index 0831430..058144f 100644
--- a/src/util.rs
+++ b/src/util.rs
@@ -1,5 +1,6 @@
 use std::time::Duration;
 
+use const_format::concatcp;
 use futures::future::try_join_all;
 use openssl::sha::Sha1;
 use reqwest::Proxy;
@@ -15,7 +16,7 @@ pub fn string_to_hash(str: String) -> String {
 
 pub fn create_http_client(timeout: Duration, proxy: Option<Proxy>) -> reqwest::Client {
     let mut builder = reqwest::ClientBuilder::new()
-        .user_agent(format!("Hentai@Home {CLIENT_VERSION}"))
+        .user_agent(concatcp!("Hentai@Home ", CLIENT_VERSION))
         .tcp_keepalive(Duration::from_secs(75)) // Linux default keepalive inverval
         .connect_timeout(Duration::from_secs(5))
         .timeout(timeout)