diff --git a/http/Cargo.toml b/http/Cargo.toml
index 864c3e8b3..fdccef242 100644
--- a/http/Cargo.toml
+++ b/http/Cargo.toml
@@ -18,7 +18,7 @@ jsonrpc-core = { version = "16.0", path = "../core" }
 jsonrpc-server-utils = { version = "16.0", path = "../server-utils" }
 log = "0.4"
 net2 = "0.2"
-parking_lot = "0.10.0"
+parking_lot = "0.11.0"
 unicase = "2.0"
 
 [dev-dependencies]
diff --git a/ipc/Cargo.toml b/ipc/Cargo.toml
index 3bc1cb1fb..ff38dee14 100644
--- a/ipc/Cargo.toml
+++ b/ipc/Cargo.toml
@@ -17,7 +17,7 @@ tokio-service = "0.1"
 jsonrpc-core = { version = "16.0", path = "../core" }
 jsonrpc-server-utils = { version = "16.0", path = "../server-utils" }
 parity-tokio-ipc = "0.4"
-parking_lot = "0.10.0"
+parking_lot = "0.11.0"
 
 [dev-dependencies]
 env_logger = "0.7"
diff --git a/tcp/Cargo.toml b/tcp/Cargo.toml
index d3b8e9eb7..365d8667a 100644
--- a/tcp/Cargo.toml
+++ b/tcp/Cargo.toml
@@ -16,7 +16,7 @@ futures03 = { version = "0.3", features = ["compat"], package = "futures" }
 jsonrpc-core = { version = "16.0", path = "../core" }
 jsonrpc-server-utils = { version = "16.0", path = "../server-utils" }
 log = "0.4"
-parking_lot = "0.10.0"
+parking_lot = "0.11.0"
 tokio-service = "0.1"
 
 [dev-dependencies]
diff --git a/ws/Cargo.toml b/ws/Cargo.toml
index 81d4eb34e..2247d1098 100644
--- a/ws/Cargo.toml
+++ b/ws/Cargo.toml
@@ -15,7 +15,7 @@ futures03 = { version = "0.3", package = "futures", features = [ "compat" ] }
 jsonrpc-core = { version = "16.0", path = "../core" }
 jsonrpc-server-utils = { version = "16.0", path = "../server-utils" }
 log = "0.4"
-parking_lot = "0.10.0"
+parking_lot = "0.11.0"
 slab = "0.4"
 parity-ws = "0.10"