diff --git a/Cargo.lock b/Cargo.lock
index 1e9f57900..32a6326f7 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2,7 +2,7 @@
 name = "parity"
 version = "0.9.99"
 dependencies = [
- "clippy 0.0.41 (registry+https://github.com/rust-lang/crates.io-index)",
+ "clippy 0.0.42 (registry+https://github.com/rust-lang/crates.io-index)",
  "ctrlc 1.0.1 (git+https://github.com/tomusdrw/rust-ctrlc.git)",
  "docopt 0.6.78 (registry+https://github.com/rust-lang/crates.io-index)",
  "docopt_macros 0.6.81 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -38,6 +38,9 @@ dependencies = [
 name = "aster"
 version = "0.12.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "syntex_syntax 0.28.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
 
 [[package]]
 name = "bitflags"
@@ -61,7 +64,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "clippy"
-version = "0.0.41"
+version = "0.0.42"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "regex-syntax 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -167,7 +170,7 @@ dependencies = [
 name = "ethcore"
 version = "0.9.99"
 dependencies = [
- "clippy 0.0.41 (registry+https://github.com/rust-lang/crates.io-index)",
+ "clippy 0.0.42 (registry+https://github.com/rust-lang/crates.io-index)",
  "crossbeam 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "env_logger 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "ethash 0.9.99",
@@ -186,16 +189,17 @@ dependencies = [
 name = "ethcore-rpc"
 version = "0.9.99"
 dependencies = [
- "clippy 0.0.41 (registry+https://github.com/rust-lang/crates.io-index)",
+ "clippy 0.0.42 (registry+https://github.com/rust-lang/crates.io-index)",
  "ethcore 0.9.99",
  "ethcore-util 0.9.99",
  "ethsync 0.9.99",
- "jsonrpc-core 1.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "jsonrpc-core 1.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "jsonrpc-http-server 1.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustc-serialize 0.3.18 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 0.6.13 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_codegen 0.6.13 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde_json 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_macros 0.6.13 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syntex 0.28.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "target_info 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -204,7 +208,7 @@ name = "ethcore-util"
 version = "0.9.99"
 dependencies = [
  "arrayvec 0.3.15 (registry+https://github.com/rust-lang/crates.io-index)",
- "clippy 0.0.41 (registry+https://github.com/rust-lang/crates.io-index)",
+ "clippy 0.0.42 (registry+https://github.com/rust-lang/crates.io-index)",
  "crossbeam 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "elastic-array 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "env_logger 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -232,7 +236,7 @@ dependencies = [
 name = "ethsync"
 version = "0.9.99"
 dependencies = [
- "clippy 0.0.41 (registry+https://github.com/rust-lang/crates.io-index)",
+ "clippy 0.0.42 (registry+https://github.com/rust-lang/crates.io-index)",
  "env_logger 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "ethcore 0.9.99",
  "ethcore-util 0.9.99",
@@ -346,12 +350,13 @@ dependencies = [
 
 [[package]]
 name = "jsonrpc-core"
-version = "1.1.2"
+version = "1.1.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "serde 0.6.13 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_codegen 0.6.13 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde_json 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_macros 0.6.13 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syntex 0.28.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -360,7 +365,7 @@ version = "1.1.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "hyper 0.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "jsonrpc-core 1.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "jsonrpc-core 1.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -529,6 +534,9 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 name = "quasi"
 version = "0.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "syntex_syntax 0.28.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
 
 [[package]]
 name = "quasi_codegen"
@@ -536,14 +544,8 @@ version = "0.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "aster 0.12.0 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
-[[package]]
-name = "quasi_macros"
-version = "0.6.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "quasi_codegen 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syntex 0.28.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syntex_syntax 0.28.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -631,7 +633,9 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "aster 0.12.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "quasi 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "quasi_macros 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quasi_codegen 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syntex 0.28.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syntex_syntax 0.28.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -643,14 +647,6 @@ dependencies = [
  "serde 0.6.13 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
-[[package]]
-name = "serde_macros"
-version = "0.6.13"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "serde_codegen 0.6.13 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
 [[package]]
 name = "sha3"
 version = "0.1.0"
@@ -682,11 +678,41 @@ name = "strsim"
 version = "0.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "syntex"
+version = "0.28.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "syntex_syntax 0.28.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "syntex_syntax"
+version = "0.28.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "bitflags 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rustc-serialize 0.3.18 (registry+https://github.com/rust-lang/crates.io-index)",
+ "term 0.2.14 (registry+https://github.com/rust-lang/crates.io-index)",
+ "unicode-xid 0.0.3 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "target_info"
 version = "0.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "term"
+version = "0.2.14"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "kernel32-sys 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.2.5 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "time"
 version = "0.1.34"
@@ -733,6 +759,11 @@ name = "unicode-normalization"
 version = "0.1.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "unicode-xid"
+version = "0.0.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "url"
 version = "0.2.38"
diff --git a/Cargo.toml b/Cargo.toml
index c58cacf0d..0a55038dc 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -12,7 +12,7 @@ rustc-serialize = "0.3"
 docopt = "0.6"
 docopt_macros = "0.6"
 ctrlc = { git = "https://github.com/tomusdrw/rust-ctrlc.git" }
-clippy = "0.0.41"
+clippy = "0.0.42"
 ethcore-util = { path = "util" }
 ethcore = { path = "ethcore" }
 ethsync = { path = "sync" }
diff --git a/ethcore/Cargo.toml b/ethcore/Cargo.toml
index 3d4d27520..5298a253f 100644
--- a/ethcore/Cargo.toml
+++ b/ethcore/Cargo.toml
@@ -18,7 +18,7 @@ ethcore-util = { path = "../util" }
 evmjit = { path = "../evmjit", optional = true }
 ethash = { path = "../ethash" }
 num_cpus = "0.2"
-clippy = "0.0.41"
+clippy = "0.0.42"
 crossbeam = "0.1.5"
 lazy_static = "0.1"
 
diff --git a/rpc/Cargo.toml b/rpc/Cargo.toml
index b1af0a2fa..4e79fa8f5 100644
--- a/rpc/Cargo.toml
+++ b/rpc/Cargo.toml
@@ -4,18 +4,28 @@ name = "ethcore-rpc"
 version = "0.9.99"
 license = "GPL-3.0"
 authors = ["Ethcore <admin@ethcore.io"]
+build = "build.rs"
 
 [lib]
 
 [dependencies]
 serde = "0.6.7"
-serde_macros = "0.6.13"
 serde_json = "0.6.0"
-jsonrpc-core = "1.1.2"
-jsonrpc-http-server = "1.1.2"
+jsonrpc-core = "1.1"
+jsonrpc-http-server = "1.1"
 ethcore-util = { path = "../util" }
 ethcore = { path = "../ethcore" }
 ethsync = { path = "../sync" }
-clippy = "0.0.41"
+clippy = "0.0.42"
 target_info = "0.1.0"
 rustc-serialize = "0.3"
+serde_macros = { version = "0.6.13", optional = true }
+
+[build-dependencies]
+serde_codegen = { "version" = "0.6.13", "optional" = true }
+syntex = "0.28.0"
+
+[features]
+default = ["serde_codegen"]
+nightly = ["serde_macros"]
+
diff --git a/rpc/build.rs b/rpc/build.rs
new file mode 100644
index 000000000..fe1a55694
--- /dev/null
+++ b/rpc/build.rs
@@ -0,0 +1,29 @@
+#[cfg(not(feature = "serde_macros"))]
+mod inner {
+    extern crate syntex;
+    extern crate serde_codegen;
+
+    use std::env;
+    use std::path::Path;
+
+    pub fn main() {
+        let out_dir = env::var_os("OUT_DIR").unwrap();
+
+        let src = Path::new("src/lib.rs.in");
+        let dst = Path::new(&out_dir).join("lib.rs");
+
+        let mut registry = syntex::Registry::new();
+
+        serde_codegen::register(&mut registry);
+        registry.expand("", &src, &dst).unwrap();
+    }
+}
+
+#[cfg(feature = "serde_macros")]
+mod inner {
+    pub fn main() {}
+}
+
+fn main() {
+    inner::main();
+}
diff --git a/rpc/src/lib.rs b/rpc/src/lib.rs
index 0b148c983..81e1b24c2 100644
--- a/rpc/src/lib.rs
+++ b/rpc/src/lib.rs
@@ -15,10 +15,8 @@
 // along with Parity.  If not, see <http://www.gnu.org/licenses/>.
 
 //! Ethcore rpc.
-#![warn(missing_docs)]
-#![feature(custom_derive, custom_attribute, plugin)]
-#![plugin(serde_macros)]
-#![plugin(clippy)]
+#![cfg_attr(nightly, feature(custom_derive, custom_attribute, plugin))]
+#![cfg_attr(nightly, plugin(serde_macros, clippy))]
 
 extern crate rustc_serialize;
 extern crate target_info;
@@ -30,38 +28,8 @@ extern crate ethcore_util as util;
 extern crate ethcore;
 extern crate ethsync;
 
-use self::jsonrpc_core::{IoHandler, IoDelegate};
+#[cfg(feature = "serde_macros")]
+include!("lib.rs.in");
 
-pub mod v1;
-
-/// Http server.
-pub struct HttpServer {
-	handler: IoHandler,
-	threads: usize
-}
-
-impl HttpServer {
-	/// Construct new http server object with given number of threads.
-	pub fn new(threads: usize) -> HttpServer {
-		HttpServer {
-			handler: IoHandler::new(),
-			threads: threads
-		}
-	}
-
-	/// Add io delegate.
-	pub fn add_delegate<D>(&mut self, delegate: IoDelegate<D>) where D: Send + Sync + 'static {
-		self.handler.add_delegate(delegate);
-	}
-
-	/// Start server asynchronously in new thread
-	pub fn start_async(self, addr: &str) {
-		let server = jsonrpc_http_server::Server::new(self.handler, self.threads);
-		server.start_async(addr)
-	}
-}
-
-/// Lib needs at least 1 test to generate coverage reports correctly.
-#[test]
-fn if_works() {
-}
+#[cfg(not(feature = "serde_macros"))]
+include!(concat!(env!("OUT_DIR"), "/lib.rs"));
diff --git a/rpc/src/lib.rs.in b/rpc/src/lib.rs.in
new file mode 100644
index 000000000..f09a25be8
--- /dev/null
+++ b/rpc/src/lib.rs.in
@@ -0,0 +1,30 @@
+use self::jsonrpc_core::{IoHandler, IoDelegate};
+
+pub mod v1;
+
+/// Http server.
+pub struct HttpServer {
+	handler: IoHandler,
+	threads: usize
+}
+
+impl HttpServer {
+	/// Construct new http server object with given number of threads.
+	pub fn new(threads: usize) -> HttpServer {
+		HttpServer {
+			handler: IoHandler::new(),
+			threads: threads
+		}
+	}
+
+	/// Add io delegate.
+	pub fn add_delegate<D>(&mut self, delegate: IoDelegate<D>) where D: Send + Sync + 'static {
+		self.handler.add_delegate(delegate);
+	}
+
+	/// Start server asynchronously in new thread
+	pub fn start_async(self, addr: &str) {
+		let server = jsonrpc_http_server::Server::new(self.handler, self.threads);
+		server.start_async(addr)
+	}
+}
diff --git a/sync/Cargo.toml b/sync/Cargo.toml
index 92b46fc57..db1a7ba82 100644
--- a/sync/Cargo.toml
+++ b/sync/Cargo.toml
@@ -10,7 +10,7 @@ authors = ["Ethcore <admin@ethcore.io"]
 [dependencies]
 ethcore-util = { path = "../util" }
 ethcore = { path = ".." }
-clippy = "0.0.41"
+clippy = "0.0.42"
 log = "0.3"
 env_logger = "0.3"
 time = "0.1.34"
diff --git a/util/Cargo.toml b/util/Cargo.toml
index 9ead8ccf6..8ca86d26b 100644
--- a/util/Cargo.toml
+++ b/util/Cargo.toml
@@ -26,7 +26,7 @@ crossbeam = "0.2"
 slab = { git = "https://github.com/arkpar/slab.git" }
 sha3 = { path = "sha3" }
 serde = "0.6.7"
-clippy = "0.0.41"
+clippy = "0.0.42"
 json-tests = { path = "json-tests" }
 target_info = "0.1.0"
 igd = "0.4.2"