diff --git a/Cargo.lock b/Cargo.lock
index 35d300443d14..2b457cefc17b 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2101,7 +2101,7 @@ dependencies = [
 
 [[package]]
 name = "shadowsocks-rust"
-version = "1.15.0-alpha.2"
+version = "1.15.0-alpha.3"
 dependencies = [
  "build-time",
  "byte_string",
diff --git a/Cargo.toml b/Cargo.toml
index 62582c5ecb5b..da828aee5547 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "shadowsocks-rust"
-version = "1.15.0-alpha.2"
+version = "1.15.0-alpha.3"
 authors = ["Shadowsocks Contributors"]
 description = "shadowsocks is a fast tunnel proxy that helps you bypass firewalls."
 repository = "https://github.com/shadowsocks/shadowsocks-rust"
@@ -158,7 +158,7 @@ build-time = "0.1"
 directories = "4.0"
 xdg = "2.4"
 rpassword = "6.0"
-libc = "0.2"
+libc = { version = "0.2", features = ["extra_traits"] }
 
 futures = "0.3"
 tokio = { version = "1", features = ["rt", "signal"] }