diff --git a/Cargo.lock b/Cargo.lock
index c5a2d7e8b2a0..ba5926fe8eae 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -204,7 +204,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "44501a9f7961bb539b67be0c428b3694e26557046a52759ca7eaf790030a64cc"
 dependencies = [
  "async-macros",
- "async-task 1.3.1",
+ "async-task",
  "crossbeam-channel 0.3.9",
  "crossbeam-deque",
  "crossbeam-utils 0.6.6",
@@ -225,26 +225,28 @@ dependencies = [
 
 [[package]]
 name = "async-std"
-version = "1.6.0"
+version = "1.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a45cee2749d880d7066e328a7e161c7470ced883b2fd000ca4643e9f1dd5083a"
+checksum = "538ecb01eb64eecd772087e5b6f7540cbc917f047727339a472dafed2185b267"
 dependencies = [
- "async-task 3.0.0",
+ "async-task",
+ "broadcaster",
+ "crossbeam-channel 0.4.2",
+ "crossbeam-deque",
  "crossbeam-utils 0.7.2",
- "futures-channel",
  "futures-core",
  "futures-io",
- "futures-timer 3.0.2",
+ "futures-timer 2.0.2",
  "kv-log-macro",
  "log 0.4.8",
  "memchr",
+ "mio",
+ "mio-uds",
  "num_cpus",
  "once_cell",
  "pin-project-lite",
  "pin-utils",
  "slab",
- "smol",
- "wasm-bindgen-futures",
 ]
 
 [[package]]
@@ -257,12 +259,6 @@ dependencies = [
  "winapi 0.3.8",
 ]
 
-[[package]]
-name = "async-task"
-version = "3.0.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c17772156ef2829aadc587461c7753af20b7e8db1529bc66855add962a3b35d3"
-
 [[package]]
 name = "async-tls"
 version = "0.7.0"
@@ -459,6 +455,20 @@ dependencies = [
  "byte-tools",
 ]
 
+[[package]]
+name = "broadcaster"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d9c972e21e0d055a36cf73e4daae870941fe7a8abcd5ac3396aab9e4c126bd87"
+dependencies = [
+ "futures-channel",
+ "futures-core",
+ "futures-sink",
+ "futures-util",
+ "parking_lot 0.10.2",
+ "slab",
+]
+
 [[package]]
 name = "bs58"
 version = "0.3.1"
@@ -774,20 +784,6 @@ dependencies = [
  "cfg-if",
 ]
 
-[[package]]
-name = "crossbeam"
-version = "0.7.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "69323bff1fb41c635347b8ead484a5ca6c3f11914d784170b158d8449ab07f8e"
-dependencies = [
- "cfg-if",
- "crossbeam-channel 0.4.2",
- "crossbeam-deque",
- "crossbeam-epoch",
- "crossbeam-queue",
- "crossbeam-utils 0.7.2",
-]
-
 [[package]]
 name = "crossbeam-channel"
 version = "0.3.9"
@@ -4149,18 +4145,6 @@ version = "0.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8b870d8c151b6f2fb93e84a13146138f05d02ed11c7e7c54f8826aaaf7c9f184"
 
-[[package]]
-name = "piper"
-version = "0.1.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6b0deb65f46e873ba8aa7c6a8dbe3f23cb1bf59c339a81a1d56361dde4d66ac8"
-dependencies = [
- "crossbeam-utils 0.7.2",
- "futures-io",
- "futures-sink",
- "futures-util",
-]
-
 [[package]]
 name = "pkg-config"
 version = "0.3.17"
@@ -6318,12 +6302,6 @@ version = "1.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ea6a9290e3c9cf0f18145ef7ffa62d68ee0bf5fcd651017e586dc7fd5da448c2"
 
-[[package]]
-name = "scoped-tls-hkt"
-version = "0.1.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c2e9d7eaddb227e8fbaaa71136ae0e1e913ca159b86c7da82f3e8f0044ad3a63"
-
 [[package]]
 name = "scopeguard"
 version = "1.1.0"
@@ -6601,25 +6579,6 @@ version = "1.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "c7cb5678e1615754284ec264d9bb5b4c27d2018577fd90ac0ceb578591ed5ee4"
 
-[[package]]
-name = "smol"
-version = "0.1.10"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "686c634ad1873fffef6aed20f180eede424fbf3bb31802394c90fd7335a661b7"
-dependencies = [
- "async-task 3.0.0",
- "crossbeam",
- "futures-io",
- "futures-util",
- "nix 0.17.0",
- "once_cell",
- "piper",
- "scoped-tls-hkt",
- "slab",
- "socket2",
- "wepoll-binding",
-]
-
 [[package]]
 name = "snow"
 version = "0.6.2"
@@ -7431,7 +7390,7 @@ name = "substrate-prometheus-endpoint"
 version = "0.8.0-rc2"
 source = "git+https://github.com/paritytech/substrate#cd305af2a9f8ec7d13081b6dc6807014b207dab8"
 dependencies = [
- "async-std 1.6.0",
+ "async-std 1.5.0",
  "derive_more 0.99.7",
  "futures-util",
  "hyper 0.13.5",
@@ -8664,25 +8623,6 @@ dependencies = [
  "webpki",
 ]
 
-[[package]]
-name = "wepoll-binding"
-version = "2.0.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "374fff4ff9701ff8b6ad0d14bacd3156c44063632d8c136186ff5967d48999a7"
-dependencies = [
- "bitflags",
- "wepoll-sys",
-]
-
-[[package]]
-name = "wepoll-sys"
-version = "2.0.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9082a777aed991f6769e2b654aa0cb29f1c3d615daf009829b07b66c7aff6a24"
-dependencies = [
- "cc",
-]
-
 [[package]]
 name = "westend-runtime"
 version = "0.8.1"