diff --git a/demos/remote_attestation/init_ra_flow/init_ra/Cargo.toml b/demos/remote_attestation/init_ra_flow/init_ra/Cargo.toml
index fae53884..8cc375ec 100644
--- a/demos/remote_attestation/init_ra_flow/init_ra/Cargo.toml
+++ b/demos/remote_attestation/init_ra_flow/init_ra/Cargo.toml
@@ -3,7 +3,7 @@ name = "init"
 version = "0.0.1"
 build = "build.rs"
 authors = ["LI Qing geding.lq@antgroup.com"]
-edition = "2018"
+edition = "2021"
 
 [dependencies]
 libc = "0.2.84"
diff --git a/deps/rust-sgx-sdk b/deps/rust-sgx-sdk
index 653ffa62..13fb3476 160000
--- a/deps/rust-sgx-sdk
+++ b/deps/rust-sgx-sdk
@@ -1 +1 @@
-Subproject commit 653ffa62d35fa2996e4a45e9ff89a1391cbd0133
+Subproject commit 13fb3476f53d21614bb863dc7de825e70938ce36
diff --git a/example/init_ra/Cargo.toml b/example/init_ra/Cargo.toml
index fae53884..8cc375ec 100644
--- a/example/init_ra/Cargo.toml
+++ b/example/init_ra/Cargo.toml
@@ -3,7 +3,7 @@ name = "init"
 version = "0.0.1"
 build = "build.rs"
 authors = ["LI Qing geding.lq@antgroup.com"]
-edition = "2018"
+edition = "2021"
 
 [dependencies]
 libc = "0.2.84"
diff --git a/src/exec/Cargo.toml b/src/exec/Cargo.toml
index f14e8a76..46c584d2 100644
--- a/src/exec/Cargo.toml
+++ b/src/exec/Cargo.toml
@@ -1,7 +1,7 @@
 [package]
 name = "occlum_exec"
-version = "0.28.1"
-edition = "2018"
+version = "0.29.0"
+edition = "2021"
 
 [lib]
 doctest = false
diff --git a/src/exec/rust-toolchain b/src/exec/rust-toolchain
index 7cc42efd..480e8aa7 100644
--- a/src/exec/rust-toolchain
+++ b/src/exec/rust-toolchain
@@ -1 +1 @@
-nightly-2021-11-01
+nightly-2022-02-23
diff --git a/src/libos/Cargo.lock b/src/libos/Cargo.lock
index c5242028..3c5f4391 100644
--- a/src/libos/Cargo.lock
+++ b/src/libos/Cargo.lock
@@ -218,7 +218,7 @@ dependencies = [
 
 [[package]]
 name = "hashbrown_tstd"
-version = "0.11.2"
+version = "0.12.0"
 
 [[package]]
 name = "ident_case"
@@ -591,11 +591,11 @@ dependencies = [
 
 [[package]]
 name = "sgx_alloc"
-version = "1.1.4"
+version = "1.1.5"
 
 [[package]]
 name = "sgx_backtrace_sys"
-version = "1.1.4"
+version = "1.1.5"
 dependencies = [
  "cc",
  "sgx_build_helper",
@@ -604,11 +604,11 @@ dependencies = [
 
 [[package]]
 name = "sgx_build_helper"
-version = "1.1.4"
+version = "1.1.5"
 
 [[package]]
 name = "sgx_cov"
-version = "1.1.4"
+version = "1.1.5"
 dependencies = [
  "lazy_static",
  "profiler_builtins",
@@ -620,18 +620,18 @@ dependencies = [
 
 [[package]]
 name = "sgx_demangle"
-version = "1.1.4"
+version = "1.1.5"
 
 [[package]]
 name = "sgx_libc"
-version = "1.1.4"
+version = "1.1.5"
 dependencies = [
  "sgx_types",
 ]
 
 [[package]]
 name = "sgx_rand"
-version = "1.1.4"
+version = "1.1.5"
 dependencies = [
  "sgx_trts",
  "sgx_tstd",
@@ -640,14 +640,14 @@ dependencies = [
 
 [[package]]
 name = "sgx_tcrypto"
-version = "1.1.4"
+version = "1.1.5"
 dependencies = [
  "sgx_types",
 ]
 
 [[package]]
 name = "sgx_tprotected_fs"
-version = "1.1.4"
+version = "1.1.5"
 dependencies = [
  "sgx_trts",
  "sgx_types",
@@ -655,7 +655,7 @@ dependencies = [
 
 [[package]]
 name = "sgx_trts"
-version = "1.1.4"
+version = "1.1.5"
 dependencies = [
  "sgx_libc",
  "sgx_types",
@@ -663,14 +663,14 @@ dependencies = [
 
 [[package]]
 name = "sgx_tse"
-version = "1.1.4"
+version = "1.1.5"
 dependencies = [
  "sgx_types",
 ]
 
 [[package]]
 name = "sgx_tstd"
-version = "1.1.4"
+version = "1.1.5"
 dependencies = [
  "hashbrown_tstd",
  "sgx_alloc",
@@ -685,11 +685,11 @@ dependencies = [
 
 [[package]]
 name = "sgx_types"
-version = "1.1.4"
+version = "1.1.5"
 
 [[package]]
 name = "sgx_unwind"
-version = "1.1.4"
+version = "1.1.5"
 dependencies = [
  "sgx_build_helper",
 ]
diff --git a/src/libos/Cargo.toml b/src/libos/Cargo.toml
index db279445..4b465723 100644
--- a/src/libos/Cargo.toml
+++ b/src/libos/Cargo.toml
@@ -1,7 +1,7 @@
 [package]
 name = "Occlum"
-version = "0.28.1"
-edition = "2018"
+version = "0.29.0"
+edition = "2021"
 
 [lib]
 name = "occlum_libos_core_rs"
diff --git a/src/libos/rust-toolchain b/src/libos/rust-toolchain
index 7cc42efd..480e8aa7 100644
--- a/src/libos/rust-toolchain
+++ b/src/libos/rust-toolchain
@@ -1 +1 @@
-nightly-2021-11-01
+nightly-2022-02-23
diff --git a/src/libos/src/entry.rs b/src/libos/src/entry.rs
index 2e4dfbd9..d292333f 100644
--- a/src/libos/src/entry.rs
+++ b/src/libos/src/entry.rs
@@ -107,40 +107,40 @@ pub extern "C" fn occlum_ecall_init(
 
     // Parse host file
     let resolv_conf_ptr = unsafe { (*file_buffer).resolv_conf_buf };
-    match parse_host_file(HostFile::RESOLV_CONF, resolv_conf_ptr) {
+    match parse_host_file(HostFile::ResolvConf, resolv_conf_ptr) {
         Err(e) => {
             error!("failed to parse /etc/resolv.conf: {}", e.backtrace());
         }
         Ok(resolv_conf_str) => {
             *RESOLV_CONF_STR.write().unwrap() = Some(resolv_conf_str);
-            if let Err(e) = write_host_file(HostFile::RESOLV_CONF) {
+            if let Err(e) = write_host_file(HostFile::ResolvConf) {
                 error!("failed to write /etc/resolv.conf: {}", e.backtrace());
             }
         }
     }
 
     let hostname_ptr = unsafe { (*file_buffer).hostname_buf };
-    match parse_host_file(HostFile::HOSTNAME, hostname_ptr) {
+    match parse_host_file(HostFile::HostName, hostname_ptr) {
         Err(e) => {
             error!("failed to parse /etc/hostname: {}", e.backtrace());
         }
         Ok(hostname_str) => {
             misc::init_nodename(&hostname_str);
             *HOSTNAME_STR.write().unwrap() = Some(hostname_str);
-            if let Err(e) = write_host_file(HostFile::HOSTNAME) {
+            if let Err(e) = write_host_file(HostFile::HostName) {
                 error!("failed to write /etc/hostname: {}", e.backtrace());
             }
         }
     }
 
     let hosts_ptr = unsafe { (*file_buffer).hosts_buf };
-    match parse_host_file(HostFile::HOSTS, hosts_ptr) {
+    match parse_host_file(HostFile::Hosts, hosts_ptr) {
         Err(e) => {
             error!("failed to parse /etc/hosts: {}", e.backtrace());
         }
         Ok(hosts_str) => {
             *HOSTS_STR.write().unwrap() = Some(hosts_str);
-            if let Err(e) = write_host_file(HostFile::HOSTS) {
+            if let Err(e) = write_host_file(HostFile::Hosts) {
                 error!("failed to write /etc/hosts: {}", e.backtrace());
             }
         }
diff --git a/src/libos/src/fs/fs_ops/mount.rs b/src/libos/src/fs/fs_ops/mount.rs
index d1ffc9d5..4979b9fc 100644
--- a/src/libos/src/fs/fs_ops/mount.rs
+++ b/src/libos/src/fs/fs_ops/mount.rs
@@ -31,15 +31,15 @@ pub fn do_mount_rootfs(
     });
 
     // Write resolv.conf file into mounted file system
-    write_host_file(HostFile::RESOLV_CONF)?;
+    write_host_file(HostFile::ResolvConf)?;
     *RESOLV_CONF_STR.write().unwrap() = None;
 
     // Write hostname file into mounted file system
-    write_host_file(HostFile::HOSTNAME)?;
+    write_host_file(HostFile::HostName)?;
     *HOSTNAME_STR.write().unwrap() = None;
 
     // Write hosts file into mounted file system
-    write_host_file(HostFile::HOSTS)?;
+    write_host_file(HostFile::Hosts)?;
     *HOSTS_STR.write().unwrap() = None;
 
     Ok(())
diff --git a/src/libos/src/fs/hostfs.rs b/src/libos/src/fs/hostfs.rs
index b18ca96d..4227b3ea 100644
--- a/src/libos/src/fs/hostfs.rs
+++ b/src/libos/src/fs/hostfs.rs
@@ -355,7 +355,7 @@ trait IntoFsMetadata {
 impl IntoFsMetadata for fs::Metadata {
     fn into_fs_metadata(self) -> Metadata {
         use sgx_trts::libc;
-        use std::os::fs::MetadataExt;
+        use std::os::linux::fs::MetadataExt;
         Metadata {
             dev: self.st_dev() as usize,
             inode: self.st_ino() as usize,
diff --git a/src/libos/src/lib.rs b/src/libos/src/lib.rs
index de4b0c16..06b994ae 100644
--- a/src/libos/src/lib.rs
+++ b/src/libos/src/lib.rs
@@ -16,7 +16,6 @@
 #![feature(dropck_eyepatch)]
 // for UntrustedSliceAlloc in slice_alloc
 #![feature(slice_ptr_get)]
-#![feature(maybe_uninit_extra)]
 #![feature(get_mut_unchecked)]
 // for std::hint::black_box
 #![feature(test)]
diff --git a/src/libos/src/util/host_file_util.rs b/src/libos/src/util/host_file_util.rs
index 80f2040a..fef7e836 100644
--- a/src/libos/src/util/host_file_util.rs
+++ b/src/libos/src/util/host_file_util.rs
@@ -15,16 +15,16 @@ pub struct host_file_buffer {
 }
 
 pub enum HostFile {
-    HOSTS,
-    HOSTNAME,
-    RESOLV_CONF,
+    Hosts,
+    HostName,
+    ResolvConf,
 }
 
 pub fn write_host_file(host_file: HostFile) -> Result<()> {
     let file_path: &str = match host_file {
-        HostFile::HOSTS => "/etc/hosts",
-        HostFile::HOSTNAME => "/etc/hostname",
-        HostFile::RESOLV_CONF => "/etc/resolv.conf",
+        HostFile::Hosts => "/etc/hosts",
+        HostFile::HostName => "/etc/hostname",
+        HostFile::ResolvConf => "/etc/resolv.conf",
         _ => return_errno!(EINVAL, "Unsupported host file"),
     };
 
@@ -37,9 +37,9 @@ pub fn write_host_file(host_file: HostFile) -> Result<()> {
     )?;
 
     let host_file_str = match host_file {
-        HostFile::HOSTS => HOSTS_STR.read().unwrap(),
-        HostFile::HOSTNAME => HOSTNAME_STR.read().unwrap(),
-        HostFile::RESOLV_CONF => RESOLV_CONF_STR.read().unwrap(),
+        HostFile::Hosts => HOSTS_STR.read().unwrap(),
+        HostFile::HostName => HOSTNAME_STR.read().unwrap(),
+        HostFile::ResolvConf => RESOLV_CONF_STR.read().unwrap(),
         _ => return_errno!(EINVAL, "Unsupported host file"),
     };
 
@@ -62,12 +62,12 @@ pub fn parse_host_file(host_file: HostFile, host_file_ptr: *const c_char) -> Res
 
     // Parse and inspect host file
     match host_file {
-        HostFile::HOSTS => {
+        HostFile::Hosts => {
             if let Err(_) = hosts_parser_util::parse_hosts_buffer(host_file_bytes) {
                 return_errno!(EINVAL, "malformated host /etc/hosts");
             }
         }
-        HostFile::HOSTNAME => match hosts_parser_util::parse_hostname_buffer(host_file_bytes) {
+        HostFile::HostName => match hosts_parser_util::parse_hostname_buffer(host_file_bytes) {
             Err(_) => {
                 return_errno!(EINVAL, "malformated host /etc/hostname");
             }
@@ -75,7 +75,7 @@ pub fn parse_host_file(host_file: HostFile, host_file_ptr: *const c_char) -> Res
                 return Ok(hostname_str);
             }
         },
-        HostFile::RESOLV_CONF => {
+        HostFile::ResolvConf => {
             if let Err(_) = resolv_conf::Config::parse(host_file_bytes) {
                 return_errno!(EINVAL, "malformated host /etc/resolv.conf");
             }
diff --git a/tools/copy_bom/Cargo.toml b/tools/copy_bom/Cargo.toml
index 97a6c44c..98d90ab5 100644
--- a/tools/copy_bom/Cargo.toml
+++ b/tools/copy_bom/Cargo.toml
@@ -1,7 +1,7 @@
 [package]
 name = "copy_bom"
 version = "0.1.0"
-edition = "2018"
+edition = "2021"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
diff --git a/tools/gen_internal_conf/Cargo.toml b/tools/gen_internal_conf/Cargo.toml
index 4767e226..96a9272b 100644
--- a/tools/gen_internal_conf/Cargo.toml
+++ b/tools/gen_internal_conf/Cargo.toml
@@ -2,7 +2,7 @@
 name = "gen_internal_conf"
 version = "0.2.0"
 authors = ["zongmin.gu <zongmin.gzm@alibaba-inc.com>"]
-edition = "2018"
+edition = "2021"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
diff --git a/tools/init/Cargo.toml b/tools/init/Cargo.toml
index a1903d46..7d75568d 100644
--- a/tools/init/Cargo.toml
+++ b/tools/init/Cargo.toml
@@ -2,7 +2,7 @@
 name = "init"
 version = "0.0.1"
 authors = ["LI Qing geding.lq@antgroup.com"]
-edition = "2018"
+edition = "2021"
 
 [dependencies]
 libc = "0.2.84"
diff --git a/tools/toolchains/dcap_lib/Cargo.lock b/tools/toolchains/dcap_lib/Cargo.lock
index 701cfa9c..35a2c5f4 100644
--- a/tools/toolchains/dcap_lib/Cargo.lock
+++ b/tools/toolchains/dcap_lib/Cargo.lock
@@ -25,4 +25,4 @@ dependencies = [
 
 [[package]]
 name = "sgx_types"
-version = "1.1.4"
+version = "1.1.5"