diff --git a/Cargo.lock b/Cargo.lock
index cea9a262..2849ae79 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1623,7 +1623,7 @@ dependencies = [
 
 [[package]]
 name = "shadowsocks-rust"
-version = "1.12.1"
+version = "1.12.1-alpha.1"
 dependencies = [
  "build-time",
  "byte_string",
diff --git a/Cargo.toml b/Cargo.toml
index 22618993..098a1943 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "shadowsocks-rust"
-version = "1.12.1"
+version = "1.12.1-alpha.1"
 authors = ["Shadowsocks Contributors"]
 description = "shadowsocks is a fast tunnel proxy that helps you bypass firewalls."
 repository = "https://github.com/shadowsocks/shadowsocks-rust"
diff --git a/build/build-release b/build/build-release
index 618658f2..629398a9 100755
--- a/build/build-release
+++ b/build/build-release
@@ -37,7 +37,7 @@ if [[ "${#targets[@]}" == "0" ]]; then
 fi
 
 if [[ "${use_upx}" = true ]]; then
-    if [[ ! -z $upx ]] && hash upx 2>/dev/null; then
+    if [[ -z "$upx" ]] && command -v upx &> /dev/null; then
         upx="upx -9"
     fi