diff --git a/core-client/Cargo.toml b/core-client/Cargo.toml
index fccda664a..d27329baa 100644
--- a/core-client/Cargo.toml
+++ b/core-client/Cargo.toml
@@ -8,7 +8,7 @@ keywords = ["jsonrpc", "json-rpc", "json", "rpc", "serde"]
 license = "MIT"
 name = "jsonrpc-core-client"
 repository = "https://github.com/paritytech/jsonrpc"
-version = "14.2.0"
+version = "15.0.0"
 
 categories = [
 	"asynchronous",
@@ -26,7 +26,7 @@ ipc = ["jsonrpc-client-transports/ipc"]
 arbitrary_precision = ["jsonrpc-client-transports/arbitrary_precision"]
 
 [dependencies]
-jsonrpc-client-transports = { version = "14.2", path = "./transports", default-features = false }
+jsonrpc-client-transports = { version = "15.0", path = "./transports", default-features = false }
 
 [badges]
 travis-ci = { repository = "paritytech/jsonrpc", branch = "master"}
diff --git a/core-client/transports/Cargo.toml b/core-client/transports/Cargo.toml
index c99b0bcba..82c6fa119 100644
--- a/core-client/transports/Cargo.toml
+++ b/core-client/transports/Cargo.toml
@@ -8,7 +8,7 @@ keywords = ["jsonrpc", "json-rpc", "json", "rpc", "serde"]
 license = "MIT"
 name = "jsonrpc-client-transports"
 repository = "https://github.com/paritytech/jsonrpc"
-version = "14.2.1"
+version = "15.0.0"
 
 categories = [
 	"asynchronous",
@@ -38,9 +38,9 @@ failure = "0.1"
 futures = "0.1.26"
 hyper = { version = "0.12", optional = true }
 hyper-tls = { version = "0.3.2", optional = true }
-jsonrpc-core = { version = "14.2", path = "../../core" }
-jsonrpc-pubsub = { version = "14.2", path = "../../pubsub" }
-jsonrpc-server-utils = { version = "14.2", path = "../../server-utils", optional = true }
+jsonrpc-core = { version = "15.0", path = "../../core" }
+jsonrpc-pubsub = { version = "15.0", path = "../../pubsub" }
+jsonrpc-server-utils = { version = "15.0", path = "../../server-utils", optional = true }
 log = "0.4"
 parity-tokio-ipc = { version = "0.2", optional = true }
 serde = { version = "1.0", features = ["derive"] }
@@ -51,8 +51,8 @@ url = "1.7"
 
 [dev-dependencies]
 assert_matches = "1.1"
-jsonrpc-http-server = { version = "14.2", path = "../../http" }
-jsonrpc-ipc-server = { version = "14.2", path = "../../ipc" }
+jsonrpc-http-server = { version = "15.0", path = "../../http" }
+jsonrpc-ipc-server = { version = "15.0", path = "../../ipc" }
 lazy_static = "1.0"
 env_logger = "0.7"
 tokio = "0.1"
diff --git a/core/Cargo.toml b/core/Cargo.toml
index f4bd56fec..ab582e69c 100644
--- a/core/Cargo.toml
+++ b/core/Cargo.toml
@@ -8,7 +8,7 @@ keywords = ["jsonrpc", "json-rpc", "json", "rpc", "serde"]
 license = "MIT"
 name = "jsonrpc-core"
 repository = "https://github.com/paritytech/jsonrpc"
-version = "14.2.0"
+version = "15.0.0"
 
 categories = [
 	"asynchronous",
diff --git a/derive/Cargo.toml b/derive/Cargo.toml
index efa1bdb44..7c83aebe5 100644
--- a/derive/Cargo.toml
+++ b/derive/Cargo.toml
@@ -7,7 +7,7 @@ homepage = "https://github.com/paritytech/jsonrpc"
 license = "MIT"
 name = "jsonrpc-derive"
 repository = "https://github.com/paritytech/jsonrpc"
-version = "14.2.2"
+version = "15.0.0"
 
 [lib]
 proc-macro = true
@@ -19,10 +19,10 @@ quote = "1.0.6"
 proc-macro-crate = "0.1.4"
 
 [dev-dependencies]
-jsonrpc-core = { version = "14.2", path = "../core" }
-jsonrpc-core-client = { version = "14.2", path = "../core-client" }
-jsonrpc-pubsub = { version = "14.2", path = "../pubsub" }
-jsonrpc-tcp-server = { version = "14.2", path = "../tcp" }
+jsonrpc-core = { version = "15.0", path = "../core" }
+jsonrpc-core-client = { version = "15.0", path = "../core-client" }
+jsonrpc-pubsub = { version = "15.0", path = "../pubsub" }
+jsonrpc-tcp-server = { version = "15.0", path = "../tcp" }
 futures = "~0.1.6"
 serde = { version = "1.0", features = ["derive"] }
 serde_json = "1.0"
diff --git a/http/Cargo.toml b/http/Cargo.toml
index 7474084c6..4caa7ed55 100644
--- a/http/Cargo.toml
+++ b/http/Cargo.toml
@@ -8,12 +8,12 @@ keywords = ["jsonrpc", "json-rpc", "json", "rpc", "server"]
 license = "MIT"
 name = "jsonrpc-http-server"
 repository = "https://github.com/paritytech/jsonrpc"
-version = "14.2.0"
+version = "15.0.0"
 
 [dependencies]
 hyper = "0.12"
-jsonrpc-core = { version = "14.2", path = "../core" }
-jsonrpc-server-utils = { version = "14.2", path = "../server-utils" }
+jsonrpc-core = { version = "15.0", path = "../core" }
+jsonrpc-server-utils = { version = "15.0", path = "../server-utils" }
 log = "0.4"
 net2 = "0.2"
 unicase = "2.0"
diff --git a/ipc/Cargo.toml b/ipc/Cargo.toml
index 00ada6ec4..7f18f980d 100644
--- a/ipc/Cargo.toml
+++ b/ipc/Cargo.toml
@@ -7,13 +7,13 @@ homepage = "https://github.com/paritytech/jsonrpc"
 license = "MIT"
 name = "jsonrpc-ipc-server"
 repository = "https://github.com/paritytech/jsonrpc"
-version = "14.2.0"
+version = "15.0.0"
 
 [dependencies]
 log = "0.4"
 tokio-service = "0.1"
-jsonrpc-core = { version = "14.2", path = "../core" }
-jsonrpc-server-utils = { version = "14.2", path = "../server-utils" }
+jsonrpc-core = { version = "15.0", path = "../core" }
+jsonrpc-server-utils = { version = "15.0", path = "../server-utils" }
 parity-tokio-ipc = "0.4"
 parking_lot = "0.10.0"
 
diff --git a/pubsub/Cargo.toml b/pubsub/Cargo.toml
index 589dd367d..5dcb7deef 100644
--- a/pubsub/Cargo.toml
+++ b/pubsub/Cargo.toml
@@ -8,17 +8,17 @@ keywords = ["jsonrpc", "json-rpc", "json", "rpc", "macros"]
 license = "MIT"
 name = "jsonrpc-pubsub"
 repository = "https://github.com/paritytech/jsonrpc"
-version = "14.2.0"
+version = "15.0.0"
 
 [dependencies]
 log = "0.4"
 parking_lot = "0.10.0"
-jsonrpc-core = { version = "14.2", path = "../core" }
+jsonrpc-core = { version = "15.0", path = "../core" }
 serde = "1.0"
 rand = "0.7"
 
 [dev-dependencies]
-jsonrpc-tcp-server = { version = "14.2", path = "../tcp" }
+jsonrpc-tcp-server = { version = "15.0", path = "../tcp" }
 futures = { version = "0.3", features = ["compat", "thread-pool"] }
 lazy_static = "1.4"
 
diff --git a/pubsub/more-examples/Cargo.toml b/pubsub/more-examples/Cargo.toml
index bae1e4eb4..e7e479a80 100644
--- a/pubsub/more-examples/Cargo.toml
+++ b/pubsub/more-examples/Cargo.toml
@@ -3,12 +3,12 @@ name = "jsonrpc-pubsub-examples"
 description = "Examples of Publish-Subscribe extension for jsonrpc."
 homepage = "https://github.com/paritytech/jsonrpc"
 repository = "https://github.com/paritytech/jsonrpc"
-version = "14.2.0"
+version = "15.0.0"
 authors = ["tomusdrw <tomasz@parity.io>"]
 license = "MIT"
 
 [dependencies]
-jsonrpc-core = { version = "14.2", path = "../../core" }
-jsonrpc-pubsub = { version = "14.2", path = "../" }
-jsonrpc-ws-server = { version = "14.2", path = "../../ws" }
-jsonrpc-ipc-server = { version = "14.2", path = "../../ipc" }
+jsonrpc-core = { version = "15.0", path = "../../core" }
+jsonrpc-pubsub = { version = "15.0", path = "../" }
+jsonrpc-ws-server = { version = "15.0", path = "../../ws" }
+jsonrpc-ipc-server = { version = "15.0", path = "../../ipc" }
diff --git a/server-utils/Cargo.toml b/server-utils/Cargo.toml
index 72dcf1f11..855195222 100644
--- a/server-utils/Cargo.toml
+++ b/server-utils/Cargo.toml
@@ -8,12 +8,12 @@ keywords = ["jsonrpc", "json-rpc", "json", "rpc", "serde"]
 license = "MIT"
 name = "jsonrpc-server-utils"
 repository = "https://github.com/paritytech/jsonrpc"
-version = "14.2.0"
+version = "15.0.0"
 
 [dependencies]
 bytes = "0.4"
 globset = "0.4"
-jsonrpc-core = { version = "14.2", path = "../core" }
+jsonrpc-core = { version = "15.0", path = "../core" }
 lazy_static = "1.1.0"
 log = "0.4"
 tokio = { version = "0.1.15" }
diff --git a/stdio/Cargo.toml b/stdio/Cargo.toml
index 72bda0643..7f8dd5d7e 100644
--- a/stdio/Cargo.toml
+++ b/stdio/Cargo.toml
@@ -7,11 +7,11 @@ homepage = "https://github.com/paritytech/jsonrpc"
 license = "MIT"
 name = "jsonrpc-stdio-server"
 repository = "https://github.com/paritytech/jsonrpc"
-version = "14.2.0"
+version = "15.0.0"
 
 [dependencies]
 futures = "0.1.23"
-jsonrpc-core = { version = "14.2", path = "../core" }
+jsonrpc-core = { version = "15.0", path = "../core" }
 log = "0.4"
 tokio = "0.1.7"
 tokio-codec = "0.1.0"
diff --git a/tcp/Cargo.toml b/tcp/Cargo.toml
index 0a76fa921..10ad31644 100644
--- a/tcp/Cargo.toml
+++ b/tcp/Cargo.toml
@@ -7,14 +7,14 @@ homepage = "https://github.com/paritytech/jsonrpc"
 license = "MIT"
 name = "jsonrpc-tcp-server"
 repository = "https://github.com/paritytech/jsonrpc"
-version = "14.2.0"
+version = "15.0.0"
 
 [dependencies]
 log = "0.4"
 parking_lot = "0.10.0"
 tokio-service = "0.1"
-jsonrpc-core = { version = "14.2", path = "../core" }
-jsonrpc-server-utils = { version = "14.2", path = "../server-utils" }
+jsonrpc-core = { version = "15.0", path = "../core" }
+jsonrpc-server-utils = { version = "15.0", path = "../server-utils" }
 
 [dev-dependencies]
 lazy_static = "1.0"
diff --git a/test/Cargo.toml b/test/Cargo.toml
index 679ba3953..7436abb28 100644
--- a/test/Cargo.toml
+++ b/test/Cargo.toml
@@ -1,7 +1,7 @@
 [package]
 name = "jsonrpc-test"
 description = "Simple test framework for JSON-RPC."
-version = "14.2.0"
+version = "15.0.0"
 authors = ["Tomasz Drwięga <tomasz@parity.io>"]
 license = "MIT"
 homepage = "https://github.com/paritytech/jsonrpc"
@@ -10,9 +10,9 @@ documentation = "https://docs.rs/jsonrpc-test/"
 edition = "2018"
 
 [dependencies]
-jsonrpc-core = { version = "14.2", path = "../core" }
-jsonrpc-core-client = { version = "14.2", path = "../core-client" }
-jsonrpc-pubsub = { version = "14.2", path = "../pubsub" }
+jsonrpc-core = { version = "15.0", path = "../core" }
+jsonrpc-core-client = { version = "15.0", path = "../core-client" }
+jsonrpc-pubsub = { version = "15.0", path = "../pubsub" }
 log = "0.4"
 serde = "1.0"
 serde_json = "1.0"
@@ -21,5 +21,5 @@ serde_json = "1.0"
 arbitrary_precision = ["jsonrpc-core-client/arbitrary_precision", "serde_json/arbitrary_precision", "jsonrpc-core/arbitrary_precision"]
 
 [dev-dependencies]
-jsonrpc-derive = { version = "14.2", path = "../derive" }
+jsonrpc-derive = { version = "15.0", path = "../derive" }
 
diff --git a/ws/Cargo.toml b/ws/Cargo.toml
index 0c9e0e627..7ba253eff 100644
--- a/ws/Cargo.toml
+++ b/ws/Cargo.toml
@@ -7,15 +7,15 @@ homepage = "https://github.com/paritytech/jsonrpc"
 license = "MIT"
 name = "jsonrpc-ws-server"
 repository = "https://github.com/paritytech/jsonrpc"
-version = "14.2.0"
+version = "15.0.0"
 
 [dependencies]
-jsonrpc-core = { version = "14.2", path = "../core" }
-jsonrpc-server-utils = { version = "14.2", path = "../server-utils" }
+jsonrpc-core = { version = "15.0", path = "../core" }
+jsonrpc-server-utils = { version = "15.0", path = "../server-utils" }
 log = "0.4"
 parking_lot = "0.10.0"
 slab = "0.4"
-ws = "0.9"
+parity-ws = "0.10"
 
 [badges]
 travis-ci = { repository = "paritytech/jsonrpc", branch = "master"}
diff --git a/ws/src/lib.rs b/ws/src/lib.rs
index aeae08a5d..5c1cfc3ca 100644
--- a/ws/src/lib.rs
+++ b/ws/src/lib.rs
@@ -5,7 +5,7 @@
 use jsonrpc_server_utils as server_utils;
 
 pub use jsonrpc_core;
-pub use ws;
+pub use parity_ws as ws;
 
 #[macro_use]
 extern crate log;
diff --git a/ws/src/server.rs b/ws/src/server.rs
index 4fb83d67a..d68610710 100644
--- a/ws/src/server.rs
+++ b/ws/src/server.rs
@@ -64,6 +64,8 @@ impl Server {
 			config.max_connections = max_connections;
 			// don't accept super large requests
 			config.max_fragment_size = max_payload_bytes;
+			config.max_in_buffer_capacity = max_payload_bytes;
+			config.max_out_buffer_capacity = max_payload_bytes;
 			// don't grow non-final fragments (to prevent DOS)
 			config.fragments_grow = false;
 			config.fragments_capacity = cmp::max(1, max_payload_bytes / config.fragment_size);