diff --git a/build_sysroot/Cargo.lock b/build_sysroot/Cargo.lock
index 307e0b222ca..21a4711f97a 100644
--- a/build_sysroot/Cargo.lock
+++ b/build_sysroot/Cargo.lock
@@ -132,9 +132,9 @@ dependencies = [
 
 [[package]]
 name = "libc"
-version = "0.2.99"
+version = "0.2.100"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a7f823d141fe0a24df1e23b4af4e3c7ba9e5966ec514ea068c93024aa7deb765"
+checksum = "a1fa8cddc8fbbee11227ef194b5317ed014b8acbf15139bd716a18ad3fe99ec5"
 dependencies = [
  "rustc-std-workspace-core",
 ]
@@ -206,9 +206,9 @@ dependencies = [
 
 [[package]]
 name = "rustc-demangle"
-version = "0.1.20"
+version = "0.1.21"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "dead70b0b5e03e9c814bcb6b01e03e68f7c57a80aa48c72ec92152ab3e818d49"
+checksum = "7ef03e0a2b150c7a90d01faf6254c9c48a41e95fb2a8c2ac1c6f0d2b9aefc342"
 dependencies = [
  "compiler_builtins",
  "rustc-std-workspace-core",
diff --git a/rust-toolchain b/rust-toolchain
index a4db8011dc9..626062c84dd 100644
--- a/rust-toolchain
+++ b/rust-toolchain
@@ -1,3 +1,3 @@
 [toolchain]
-channel = "nightly-2021-08-20"
+channel = "nightly-2021-08-25"
 components = ["rust-src", "rustc-dev", "llvm-tools-preview"]