diff --git a/Cargo.toml b/Cargo.toml
index 10f7152b..b286f4f7 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -21,7 +21,7 @@ futures-timer = "3.0.2"
 hex = "0.4"
 jsonrpc-core = "18.0.0"
 log = "0.4.6"
-parking_lot = "0.11.0"
+parking_lot = "0.12.1"
 rlp = "0.5"
 secp256k1 = { version = "0.20", features = ["recovery"], optional = true }
 serde = { version = "1.0.90", features = ["derive"] }