diff --git a/deps/rust-sgx-sdk b/deps/rust-sgx-sdk
index e61c9a5c..ae7ec590 160000
--- a/deps/rust-sgx-sdk
+++ b/deps/rust-sgx-sdk
@@ -1 +1 @@
-Subproject commit e61c9a5ce5e4a0161696e9c1a75807fef105c9aa
+Subproject commit ae7ec5901c75b41626011a9e3c87b4a9b194f598
diff --git a/src/libos/Cargo.lock b/src/libos/Cargo.lock
index 727d6ab0..7eaafba0 100644
--- a/src/libos/Cargo.lock
+++ b/src/libos/Cargo.lock
@@ -232,7 +232,7 @@ dependencies = [
 
 [[package]]
 name = "hashbrown_tstd"
-version = "0.9.0"
+version = "0.11.2"
 
 [[package]]
 name = "ident_case"
@@ -588,11 +588,11 @@ dependencies = [
 
 [[package]]
 name = "sgx_alloc"
-version = "1.1.3"
+version = "1.1.4"
 
 [[package]]
 name = "sgx_backtrace_sys"
-version = "1.1.3"
+version = "1.1.4"
 dependencies = [
  "cc",
  "sgx_build_helper",
@@ -601,11 +601,11 @@ dependencies = [
 
 [[package]]
 name = "sgx_build_helper"
-version = "0.1.3"
+version = "1.1.4"
 
 [[package]]
 name = "sgx_cov"
-version = "1.1.3"
+version = "1.1.4"
 dependencies = [
  "lazy_static",
  "profiler_builtins",
@@ -617,18 +617,18 @@ dependencies = [
 
 [[package]]
 name = "sgx_demangle"
-version = "1.1.3"
+version = "1.1.4"
 
 [[package]]
 name = "sgx_libc"
-version = "1.1.3"
+version = "1.1.4"
 dependencies = [
  "sgx_types",
 ]
 
 [[package]]
 name = "sgx_rand"
-version = "1.1.3"
+version = "1.1.4"
 dependencies = [
  "sgx_trts",
  "sgx_tstd",
@@ -637,14 +637,14 @@ dependencies = [
 
 [[package]]
 name = "sgx_tcrypto"
-version = "1.1.3"
+version = "1.1.4"
 dependencies = [
  "sgx_types",
 ]
 
 [[package]]
 name = "sgx_tprotected_fs"
-version = "1.1.3"
+version = "1.1.4"
 dependencies = [
  "sgx_trts",
  "sgx_types",
@@ -652,7 +652,7 @@ dependencies = [
 
 [[package]]
 name = "sgx_trts"
-version = "1.1.3"
+version = "1.1.4"
 dependencies = [
  "sgx_libc",
  "sgx_types",
@@ -660,14 +660,14 @@ dependencies = [
 
 [[package]]
 name = "sgx_tse"
-version = "1.1.3"
+version = "1.1.4"
 dependencies = [
  "sgx_types",
 ]
 
 [[package]]
 name = "sgx_tstd"
-version = "1.1.3"
+version = "1.1.4"
 dependencies = [
  "hashbrown_tstd",
  "sgx_alloc",
@@ -682,11 +682,11 @@ dependencies = [
 
 [[package]]
 name = "sgx_types"
-version = "1.1.3"
+version = "1.1.4"
 
 [[package]]
 name = "sgx_unwind"
-version = "0.1.1"
+version = "1.1.4"
 dependencies = [
  "sgx_build_helper",
 ]
diff --git a/src/libos/rust-toolchain b/src/libos/rust-toolchain
index 148ed93d..7b9ce474 100644
--- a/src/libos/rust-toolchain
+++ b/src/libos/rust-toolchain
@@ -1 +1 @@
-nightly-2020-10-25
+nightly-2021-09-13
diff --git a/src/libos/src/lib.rs b/src/libos/src/lib.rs
index 2c3f04c0..3e26fb76 100644
--- a/src/libos/src/lib.rs
+++ b/src/libos/src/lib.rs
@@ -14,7 +14,6 @@
 #![feature(negative_impls)]
 // for may_dangle in rw_lock
 #![feature(dropck_eyepatch)]
-#![feature(option_expect_none)]
 // for UntrustedSliceAlloc in slice_alloc
 #![feature(slice_ptr_get)]
 #![feature(maybe_uninit_extra)]
@@ -23,6 +22,7 @@
 #![feature(test)]
 #![feature(atomic_from_mut)]
 #![feature(btree_drain_filter)]
+#![feature(bench_black_box)]
 
 #[macro_use]
 extern crate alloc;
diff --git a/src/libos/src/process/thread/mod.rs b/src/libos/src/process/thread/mod.rs
index 3d04a246..468a6816 100644
--- a/src/libos/src/process/thread/mod.rs
+++ b/src/libos/src/process/thread/mod.rs
@@ -214,11 +214,12 @@ impl Thread {
         )
         .unwrap();
 
-        THREAD_NOTIFIERS
-            .lock()
-            .unwrap()
-            .insert(self.tid(), eventfd)
-            .expect_none("this thread should not have an eventfd before start");
+        let event_file = THREAD_NOTIFIERS.lock().unwrap().insert(self.tid(), eventfd);
+
+        assert!(
+            event_file.is_none(),
+            "this thread should not have an eventfd before start"
+        );
 
         #[cfg(feature = "syscall_timing")]
         self.profiler()
diff --git a/src/libos/src/untrusted/alloc.rs b/src/libos/src/untrusted/alloc.rs
index ec56a659..128a8dca 100644
--- a/src/libos/src/untrusted/alloc.rs
+++ b/src/libos/src/untrusted/alloc.rs
@@ -1,5 +1,5 @@
 use super::*;
-use std::alloc::{AllocError, AllocRef, Layout};
+use std::alloc::{AllocError, Allocator, Layout};
 use std::ptr::{self, write_bytes, NonNull};
 
 /// The global memory allocator for untrusted memory
@@ -7,8 +7,8 @@ pub static mut UNTRUSTED_ALLOC: UntrustedAlloc = UntrustedAlloc;
 
 pub struct UntrustedAlloc;
 
-unsafe impl AllocRef for UntrustedAlloc {
-    fn alloc(&self, layout: Layout) -> std::result::Result<NonNull<[u8]>, AllocError> {
+unsafe impl Allocator for UntrustedAlloc {
+    fn allocate(&self, layout: Layout) -> std::result::Result<NonNull<[u8]>, AllocError> {
         if layout.size() == 0 {
             return Err(AllocError);
         }
@@ -43,7 +43,7 @@ unsafe impl AllocRef for UntrustedAlloc {
         .unwrap())
     }
 
-    unsafe fn dealloc(&self, ptr: NonNull<u8>, layout: Layout) {
+    unsafe fn deallocate(&self, ptr: NonNull<u8>, layout: Layout) {
         // Pre-condition: out-of-enclave
         debug_assert!(sgx_trts::trts::rsgx_raw_is_outside_enclave(
             ptr.as_ptr(),
diff --git a/src/libos/src/untrusted/slice_alloc.rs b/src/libos/src/untrusted/slice_alloc.rs
index 5a309925..a79d830b 100644
--- a/src/libos/src/untrusted/slice_alloc.rs
+++ b/src/libos/src/untrusted/slice_alloc.rs
@@ -1,5 +1,5 @@
 use super::*;
-use std::alloc::{AllocError, AllocRef, Layout};
+use std::alloc::{AllocError, Allocator, Layout};
 use std::ptr::NonNull;
 use std::sync::atomic::{AtomicUsize, Ordering};
 
@@ -26,7 +26,7 @@ impl UntrustedSliceAlloc {
         }
 
         let layout = Layout::from_size_align(buf_size, 1)?;
-        let buf_ptr = unsafe { UNTRUSTED_ALLOC.alloc(layout)?.as_mut_ptr() };
+        let buf_ptr = unsafe { UNTRUSTED_ALLOC.allocate(layout)?.as_mut_ptr() };
 
         let buf_pos = AtomicUsize::new(0);
         Ok(Self {
@@ -72,7 +72,7 @@ impl Drop for UntrustedSliceAlloc {
 
         let layout = Layout::from_size_align(self.buf_size, 1).unwrap();
         unsafe {
-            UNTRUSTED_ALLOC.dealloc(NonNull::new(self.buf_ptr).unwrap(), layout);
+            UNTRUSTED_ALLOC.deallocate(NonNull::new(self.buf_ptr).unwrap(), layout);
         }
     }
 }