diff --git a/.bumpversion.cfg b/.bumpversion.cfg
index 61464a2..5aae892 100644
--- a/.bumpversion.cfg
+++ b/.bumpversion.cfg
@@ -1,5 +1,5 @@
 [bumpversion]
-current_version = 6.3.0-dev
+current_version = 6.3.0-alpha.0
 tag = True
 sign_tags = True
 tag_message = EVMC {new_version}
@@ -7,15 +7,15 @@ commit = True
 message = EVMC {new_version}
 	
 	Bump version: {current_version} → {new_version}
-parse = (?P<major>\d+)\.(?P<minor>\d+)\.(?P<patch>\d+)(?P<prerel>-dev)?
-serialize = 
-	{major}.{minor}.{patch}{prerel}
+parse = (?P<major>\d+)\.(?P<minor>\d+)\.(?P<patch>\d+)(-(?P<prerel>rc|alpha)\.(?P<prerelver>\d+))?
+serialize =
+	{major}.{minor}.{patch}-{prerel}.{prerelver}
 	{major}.{minor}.{patch}
 
 [bumpversion:part:prerel]
 optional_value = rel
 values = 
-	-dev
+	alpha
 	rel
 
 [bumpversion:file:CMakeLists.txt]
diff --git a/CMakeLists.txt b/CMakeLists.txt
index f90b78b..3c5a585 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -35,7 +35,7 @@ cable_configure_toolchain(DEFAULT cxx11-pic)
 cable_set_build_type(DEFAULT Release CONFIGURATION_TYPES Debug Release)
 
 project(evmc)
-set(PROJECT_VERSION 6.3.0-dev)
+set(PROJECT_VERSION 6.3.0-alpha.0)
 
 cable_configure_compiler(NO_STACK_PROTECTION)
 
diff --git a/bindings/rust/evmc-declare-tests/Cargo.toml b/bindings/rust/evmc-declare-tests/Cargo.toml
index 9087a3d..6bb7d18 100644
--- a/bindings/rust/evmc-declare-tests/Cargo.toml
+++ b/bindings/rust/evmc-declare-tests/Cargo.toml
@@ -4,7 +4,7 @@
 
 [package]
 name = "evmc-declare-tests"
-version = "6.3.0-dev"
+version = "6.3.0-alpha.0"
 authors = ["Jake Lang <jak3lang@gmail.com>"]
 license = "Apache-2.0"
 repository = "https://github.com/ethereum/evmc"
diff --git a/bindings/rust/evmc-declare/Cargo.toml b/bindings/rust/evmc-declare/Cargo.toml
index 859c2df..82c30dd 100644
--- a/bindings/rust/evmc-declare/Cargo.toml
+++ b/bindings/rust/evmc-declare/Cargo.toml
@@ -4,7 +4,7 @@
 
 [package]
 name = "evmc-declare"
-version = "6.3.0-dev"
+version = "6.3.0-alpha.0"
 authors = ["Jake Lang <jak3lang@gmail.com>"]
 license = "Apache-2.0"
 repository = "https://github.com/ethereum/evmc"
diff --git a/bindings/rust/evmc-sys/Cargo.toml b/bindings/rust/evmc-sys/Cargo.toml
index 269cf5c..9e693df 100644
--- a/bindings/rust/evmc-sys/Cargo.toml
+++ b/bindings/rust/evmc-sys/Cargo.toml
@@ -4,7 +4,7 @@
 
 [package]
 name = "evmc-sys"
-version = "6.3.0-dev"
+version = "6.3.0-alpha.0"
 authors = ["Alex Beregszaszi <alex@rtfs.hu>"]
 license = "Apache-2.0"
 repository = "https://github.com/ethereum/evmc"
diff --git a/bindings/rust/evmc-vm/Cargo.toml b/bindings/rust/evmc-vm/Cargo.toml
index 5f8ac3f..d1d23ab 100644
--- a/bindings/rust/evmc-vm/Cargo.toml
+++ b/bindings/rust/evmc-vm/Cargo.toml
@@ -4,7 +4,7 @@
 
 [package]
 name = "evmc-vm"
-version = "6.3.0-dev"
+version = "6.3.0-alpha.0"
 authors = ["Alex Beregszaszi <alex@rtfs.hu>", "Jake Lang <jak3lang@gmail.com>"]
 license = "Apache-2.0"
 repository = "https://github.com/ethereum/evmc"