diff --git a/core-client/Cargo.toml b/core-client/Cargo.toml
index 82fb8247a..e3a4510dc 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 = "12.0.0"
+version = "12.1.0"
 
 categories = [
 	"asynchronous",
@@ -24,7 +24,7 @@ http = ["jsonrpc-client-transports/http"]
 ws = ["jsonrpc-client-transports/ws"]
 
 [dependencies]
-jsonrpc-client-transports = { version = "12.0", path = "./transports", default-features = false }
+jsonrpc-client-transports = { version = "12.1", 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 308934e36..06d3a4212 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 = "12.0.0"
+version = "12.1.0"
 
 categories = [
 	"asynchronous",
@@ -32,8 +32,8 @@ failure = "0.1"
 futures = "0.1.26"
 hyper = { version = "0.12", optional = true }
 hyper-tls = { version = "0.3.2", optional = true }
-jsonrpc-core = { version = "12.0", path = "../../core" }
-jsonrpc-pubsub = { version = "12.0", path = "../../pubsub" }
+jsonrpc-core = { version = "12.1", path = "../../core" }
+jsonrpc-pubsub = { version = "12.1", path = "../../pubsub" }
 log = "0.4"
 serde = "1.0"
 serde_json = "1.0"
@@ -42,7 +42,7 @@ websocket = { version = "0.22", optional = true }
 
 [dev-dependencies]
 assert_matches = "1.1"
-jsonrpc-http-server = { version = "12.0", path = "../../http" }
+jsonrpc-http-server = { version = "12.1", path = "../../http" }
 lazy_static = "1.0"
 env_logger = "0.6"
 tokio = "0.1"
diff --git a/core/Cargo.toml b/core/Cargo.toml
index fdc705af9..d690b6ddf 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 = "12.0.0"
+version = "12.1.0"
 
 categories = [
 	"asynchronous",
diff --git a/derive/Cargo.toml b/derive/Cargo.toml
index fb5e5db02..94c85be96 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 = "12.0.0"
+version = "12.1.0"
 
 [lib]
 proc-macro = true
@@ -19,10 +19,10 @@ quote = "0.6"
 proc-macro-crate = "0.1.3"
 
 [dev-dependencies]
-jsonrpc-core = { version = "12.0", path = "../core" }
-jsonrpc-core-client = { version = "12.0", path = "../core-client" }
-jsonrpc-pubsub = { version = "12.0", path = "../pubsub" }
-jsonrpc-tcp-server = { version = "12.0", path = "../tcp" }
+jsonrpc-core = { version = "12.1", path = "../core" }
+jsonrpc-core-client = { version = "12.1", path = "../core-client" }
+jsonrpc-pubsub = { version = "12.1", path = "../pubsub" }
+jsonrpc-tcp-server = { version = "12.1", 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 4dcd8ff34..d46c1734a 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 = "12.0.0"
+version = "12.1.0"
 
 [dependencies]
 hyper = "0.12"
-jsonrpc-core = { version = "12.0", path = "../core" }
-jsonrpc-server-utils = { version = "12.0", path = "../server-utils" }
+jsonrpc-core = { version = "12.1", path = "../core" }
+jsonrpc-server-utils = { version = "12.1", path = "../server-utils" }
 log = "0.4"
 net2 = "0.2"
 unicase = "2.0"
diff --git a/http/README.md b/http/README.md
index 8a5a5e4c7..51a012bb4 100644
--- a/http/README.md
+++ b/http/README.md
@@ -9,7 +9,7 @@ Rust http server using JSON-RPC 2.0.
 
 ```
 [dependencies]
-jsonrpc-http-server = "12.0"
+jsonrpc-http-server = "12.1"
 ```
 
 `main.rs`
diff --git a/ipc/Cargo.toml b/ipc/Cargo.toml
index c517347f2..b50621628 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 = "12.0.0"
+version = "12.1.0"
 
 [dependencies]
 log = "0.4"
 tokio-service = "0.1"
-jsonrpc-core = { version = "12.0", path = "../core" }
-jsonrpc-server-utils = { version = "12.0", path = "../server-utils" }
+jsonrpc-core = { version = "12.1", path = "../core" }
+jsonrpc-server-utils = { version = "12.1", path = "../server-utils" }
 parity-tokio-ipc = "0.1"
 parking_lot = "0.8"
 
diff --git a/ipc/README.md b/ipc/README.md
index 1600826d9..d55326a43 100644
--- a/ipc/README.md
+++ b/ipc/README.md
@@ -9,7 +9,7 @@ IPC server (Windows & Linux) for JSON-RPC 2.0.
 
 ```
 [dependencies]
-jsonrpc-ipc-server = "12.0"
+jsonrpc-ipc-server = "12.1"
 ```
 
 `main.rs`
diff --git a/pubsub/Cargo.toml b/pubsub/Cargo.toml
index 96c9cf33a..f4f8dff74 100644
--- a/pubsub/Cargo.toml
+++ b/pubsub/Cargo.toml
@@ -8,16 +8,16 @@ keywords = ["jsonrpc", "json-rpc", "json", "rpc", "macros"]
 license = "MIT"
 name = "jsonrpc-pubsub"
 repository = "https://github.com/paritytech/jsonrpc"
-version = "12.0.0"
+version = "12.1.0"
 
 [dependencies]
 log = "0.4"
 parking_lot = "0.8"
-jsonrpc-core = { version = "12.0", path = "../core" }
+jsonrpc-core = { version = "12.1", path = "../core" }
 serde = "1.0"
 
 [dev-dependencies]
-jsonrpc-tcp-server = { version = "12.0", path = "../tcp" }
+jsonrpc-tcp-server = { version = "12.1", path = "../tcp" }
 
 [badges]
 travis-ci = { repository = "paritytech/jsonrpc", branch = "master"}
diff --git a/pubsub/more-examples/Cargo.toml b/pubsub/more-examples/Cargo.toml
index 11803d693..d0783da05 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 = "12.0.0"
+version = "12.1.0"
 authors = ["tomusdrw <tomasz@parity.io>"]
 license = "MIT"
 
 [dependencies]
-jsonrpc-core = { version = "12.0", path = "../../core" }
-jsonrpc-pubsub = { version = "12.0", path = "../" }
-jsonrpc-ws-server = { version = "12.0", path = "../../ws" }
-jsonrpc-ipc-server = { version = "12.0", path = "../../ipc" }
+jsonrpc-core = { version = "12.1", path = "../../core" }
+jsonrpc-pubsub = { version = "12.1", path = "../" }
+jsonrpc-ws-server = { version = "12.1", path = "../../ws" }
+jsonrpc-ipc-server = { version = "12.1", path = "../../ipc" }
diff --git a/server-utils/Cargo.toml b/server-utils/Cargo.toml
index d9cc823e6..7fff81bb9 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 = "12.0.0"
+version = "12.1.0"
 
 [dependencies]
 bytes = "0.4"
 globset = "0.4"
-jsonrpc-core = { version = "12.0", path = "../core" }
+jsonrpc-core = { version = "12.1", path = "../core" }
 lazy_static = "1.1.0"
 log = "0.4"
 num_cpus = "1.8"
diff --git a/stdio/Cargo.toml b/stdio/Cargo.toml
index 5dd60988e..fc2735cd2 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 = "12.0.0"
+version = "12.1.0"
 
 [dependencies]
 futures = "0.1.23"
-jsonrpc-core = { version = "12.0", path = "../core" }
+jsonrpc-core = { version = "12.1", path = "../core" }
 log = "0.4"
 tokio = "0.1.7"
 tokio-codec = "0.1.0"
diff --git a/stdio/README.md b/stdio/README.md
index 74c6b4c27..6039873ed 100644
--- a/stdio/README.md
+++ b/stdio/README.md
@@ -10,7 +10,7 @@ Takes one request per line and outputs each response on a new line.
 
 ```
 [dependencies]
-jsonrpc-stdio-server = "12.0"
+jsonrpc-stdio-server = "12.1"
 ```
 
 `main.rs`
diff --git a/tcp/Cargo.toml b/tcp/Cargo.toml
index 6494020d5..ae3f2936c 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 = "12.0.0"
+version = "12.1.0"
 
 [dependencies]
 log = "0.4"
 parking_lot = "0.8"
 tokio-service = "0.1"
-jsonrpc-core = { version = "12.0", path = "../core" }
-jsonrpc-server-utils = { version = "12.0", path = "../server-utils" }
+jsonrpc-core = { version = "12.1", path = "../core" }
+jsonrpc-server-utils = { version = "12.1", path = "../server-utils" }
 
 [dev-dependencies]
 lazy_static = "1.0"
diff --git a/tcp/README.md b/tcp/README.md
index b1a3dd114..5746d76a5 100644
--- a/tcp/README.md
+++ b/tcp/README.md
@@ -9,7 +9,7 @@ TCP server for JSON-RPC 2.0.
 
 ```
 [dependencies]
-jsonrpc-tcp-server = "12.0"
+jsonrpc-tcp-server = "12.1"
 ```
 
 `main.rs`
diff --git a/test/Cargo.toml b/test/Cargo.toml
index e20089a2c..376408174 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 = "12.0.0"
+version = "12.1.0"
 authors = ["Tomasz Drwięga <tomasz@parity.io>"]
 license = "MIT"
 homepage = "https://github.com/paritytech/jsonrpc"
@@ -10,13 +10,13 @@ documentation = "https://docs.rs/jsonrpc-test/"
 edition = "2018"
 
 [dependencies]
-jsonrpc-core = { path = "../core", version = "12.0" }
-jsonrpc-core-client = { path = "../core-client", version = "12.0" }
-jsonrpc-pubsub = { path = "../pubsub", version = "12.0" }
+jsonrpc-core = { version = "12.1", path = "../core" }
+jsonrpc-core-client = { version = "12.1", path = "../core-client" }
+jsonrpc-pubsub = { version = "12.1", path = "../pubsub" }
 log = "0.4"
 serde = "1.0"
 serde_json = "1.0"
 
 [dev-dependencies]
-jsonrpc-derive = { path = "../derive", version = "12.0" }
+jsonrpc-derive = { version = "12.1", path = "../derive" }
 
diff --git a/ws/Cargo.toml b/ws/Cargo.toml
index eeaa29d0a..202602d33 100644
--- a/ws/Cargo.toml
+++ b/ws/Cargo.toml
@@ -7,11 +7,11 @@ homepage = "https://github.com/paritytech/jsonrpc"
 license = "MIT"
 name = "jsonrpc-ws-server"
 repository = "https://github.com/paritytech/jsonrpc"
-version = "12.0.0"
+version = "12.1.0"
 
 [dependencies]
-jsonrpc-core = { version = "12.0", path = "../core" }
-jsonrpc-server-utils = { version = "12.0", path = "../server-utils" }
+jsonrpc-core = { version = "12.1", path = "../core" }
+jsonrpc-server-utils = { version = "12.1", path = "../server-utils" }
 log = "0.4"
 parking_lot = "0.8"
 slab = "0.4"
diff --git a/ws/README.md b/ws/README.md
index 461c2d8a1..54aab1b4e 100644
--- a/ws/README.md
+++ b/ws/README.md
@@ -9,7 +9,7 @@ WebSockets server for JSON-RPC 2.0.
 
 ```
 [dependencies]
-jsonrpc-ws-server = "12.0"
+jsonrpc-ws-server = "12.1"
 ```
 
 `main.rs`