diff --git a/bridges/relays/ethereum/Cargo.toml b/bridges/relays/ethereum/Cargo.toml
index 50db2c4b6da0a..05553d8bb5389 100644
--- a/bridges/relays/ethereum/Cargo.toml
+++ b/bridges/relays/ethereum/Cargo.toml
@@ -6,7 +6,7 @@ edition = "2018"
 
 [dependencies]
 ansi_term = "0.12"
-async-std = "1.6.0"
+async-std = "=1.5.0"
 async-stream = "0.2.0"
 async-trait = "0.1.31"
 clap = { version = "2.33.1", features = ["yaml"] }
diff --git a/bridges/relays/substrate/Cargo.toml b/bridges/relays/substrate/Cargo.toml
index 16f0a3da53b5d..7f151e55a446e 100644
--- a/bridges/relays/substrate/Cargo.toml
+++ b/bridges/relays/substrate/Cargo.toml
@@ -5,7 +5,7 @@ authors = ["Parity Technologies <admin@parity.io>"]
 edition = "2018"
 
 [dependencies]
-async-std = "1.6.0"
+async-std = "=1.5.0"
 clap = "2.33.1"
 ctrlc = "3.1.4"
 derive_more = "0.99.7"