diff --git a/build_sysroot/Cargo.lock b/build_sysroot/Cargo.lock
index b6e27245b8f29..e058a972ead3c 100644
--- a/build_sysroot/Cargo.lock
+++ b/build_sysroot/Cargo.lock
@@ -132,9 +132,9 @@ dependencies = [
 
 [[package]]
 name = "libc"
-version = "0.2.93"
+version = "0.2.94"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9385f66bf6105b241aa65a61cb923ef20efc665cb9f9bb50ac2f0c4b7f378d41"
+checksum = "18794a8ad5b29321f790b55d93dfba91e125cb1a9edbd4f8e3150acc771c1a5e"
 dependencies = [
  "rustc-std-workspace-core",
 ]
diff --git a/rust-toolchain b/rust-toolchain
index e5f85be4436fb..5442e3345aa91 100644
--- a/rust-toolchain
+++ b/rust-toolchain
@@ -1,3 +1,3 @@
 [toolchain]
-channel = "nightly-2021-04-21"
+channel = "nightly-2021-04-28"
 components = ["rust-src", "rustc-dev", "llvm-tools-preview"]