diff --git a/Cargo.lock b/Cargo.lock
index ea6129e..339a04b 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -47,7 +47,7 @@ checksum = "32a66949e030da00e8c7d4434b251670a91556f4144941d37452769c25d58a53"
 
 [[package]]
 name = "listen-probe"
-version = "0.0.0"
+version = "0.1.0"
 
 [[package]]
 name = "memchr"
@@ -57,14 +57,14 @@ checksum = "cf8baf1c55e62ffcace7a9f06f4bd9cd3f0c4beb022d3b367256b91b87513d98"
 
 [[package]]
 name = "notify-probe"
-version = "0.0.0"
+version = "0.1.0"
 dependencies = [
  "libc",
 ]
 
 [[package]]
 name = "oxctl"
-version = "0.0.0"
+version = "0.1.0"
 dependencies = [
  "oxinit-ipc",
  "oxinit-log",
@@ -73,7 +73,7 @@ dependencies = [
 
 [[package]]
 name = "oxinit"
-version = "0.0.0"
+version = "0.1.0"
 dependencies = [
  "libc",
  "oxinit-cgroup",
@@ -90,7 +90,7 @@ dependencies = [
 
 [[package]]
 name = "oxinit-cgroup"
-version = "0.0.0"
+version = "0.1.0"
 dependencies = [
  "oxinit-unit",
  "thiserror",
@@ -98,7 +98,7 @@ dependencies = [
 
 [[package]]
 name = "oxinit-graph"
-version = "0.0.0"
+version = "0.1.0"
 dependencies = [
  "oxinit-unit",
  "thiserror",
@@ -106,7 +106,7 @@ dependencies = [
 
 [[package]]
 name = "oxinit-ipc"
-version = "0.0.0"
+version = "0.1.0"
 dependencies = [
  "serde",
  "serde_json",
@@ -114,22 +114,22 @@ dependencies = [
 
 [[package]]
 name = "oxinit-log"
-version = "0.0.0"
+version = "0.1.0"
 
 [[package]]
 name = "oxinit-service"
-version = "0.0.0"
+version = "0.1.0"
 dependencies = [
  "oxinit-unit",
 ]
 
 [[package]]
 name = "oxinit-timer"
-version = "0.0.0"
+version = "0.1.0"
 
 [[package]]
 name = "oxinit-unit"
-version = "0.0.0"
+version = "0.1.0"
 dependencies = [
  "basic-toml",
  "oxinit-timer",
@@ -139,14 +139,14 @@ dependencies = [
 
 [[package]]
 name = "oxinit-user"
-version = "0.0.0"
+version = "0.1.0"
 dependencies = [
  "thiserror",
 ]
 
 [[package]]
 name = "oxlogd"
-version = "0.0.0"
+version = "0.1.0"
 dependencies = [
  "oxinit-log",
  "rustix",
@@ -280,7 +280,7 @@ dependencies = [
 
 [[package]]
 name = "xtask"
-version = "0.0.0"
+version = "0.1.0"
 
 [[package]]
 name = "zmij"
diff --git a/Cargo.toml b/Cargo.toml
index 2abdc5f..224b7ea 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -18,6 +18,7 @@ members = [
 ]
 
 [workspace.package]
+version = "0.1.0"
 edition = "2021"
 rust-version = "1.95"
 license = "MIT OR Apache-2.0"
diff --git a/README.md b/README.md
index 3276df6..cf77244 100644
--- a/README.md
+++ b/README.md
@@ -6,7 +6,9 @@ A service manager and PID 1 for Linux, written in Rust.
 [![Status](https://img.shields.io/badge/status-pre--alpha-orange)](ROADMAP.md)
 [![CI](https://github.com/youhide/oxinit/actions/workflows/ci.yml/badge.svg)](https://github.com/youhide/oxinit/actions/workflows/ci.yml)
 
-**Pre-alpha. Nothing is stable.** See [ROADMAP.md](ROADMAP.md) for what works.
+**Pre-alpha. Nothing is stable**, and the unit format may change between any
+two releases. See [ROADMAP.md](ROADMAP.md) for what works and what each
+milestone was verified against.
 
 ## What this is, in one picture
 
diff --git a/crates/listen-probe/Cargo.toml b/crates/listen-probe/Cargo.toml
index 5863f8c..a6cfaae 100644
--- a/crates/listen-probe/Cargo.toml
+++ b/crates/listen-probe/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "listen-probe"
-version = "0.0.0"
+version.workspace = true
 description = "Test fixture: a socket-activated service, and a client to poke it"
 edition.workspace = true
 rust-version.workspace = true
diff --git a/crates/notify-probe/Cargo.toml b/crates/notify-probe/Cargo.toml
index 62eba52..15c9feb 100644
--- a/crates/notify-probe/Cargo.toml
+++ b/crates/notify-probe/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "notify-probe"
-version = "0.0.0"
+version.workspace = true
 description = "Test fixture: a service that speaks sd_notify"
 edition.workspace = true
 rust-version.workspace = true
diff --git a/crates/oxctl/Cargo.toml b/crates/oxctl/Cargo.toml
index 7f9b774..c0f392e 100644
--- a/crates/oxctl/Cargo.toml
+++ b/crates/oxctl/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "oxctl"
-version = "0.0.0"
+version.workspace = true
 description = "Command-line client for oxinit"
 edition.workspace = true
 rust-version.workspace = true
diff --git a/crates/oxctl/src/main.rs b/crates/oxctl/src/main.rs
index 45bb293..1b65588 100644
--- a/crates/oxctl/src/main.rs
+++ b/crates/oxctl/src/main.rs
@@ -27,6 +27,7 @@ commands:
   restart <unit>    stop, then start once it is down
   logs <unit>       what the unit has written, from /var/log/oxinit
   reload            re-read the unit directories
+  --version         which build this is
 
 `logs` reads the file directly. It does not go through oxinit: the control
 socket has to stay responsive, and bulk data is what would stop it being.
@@ -70,6 +71,11 @@ fn run(args: &[String]) -> Result<(), String> {
             return Err(format!("{command} needs a unit name\n\n{USAGE}"))
         }
 
+        ("--version" | "-V", _) => {
+            println!("oxctl {}", env!("CARGO_PKG_VERSION"));
+            return Ok(());
+        }
+
         ("" | "help" | "--help" | "-h", _) => {
             println!("{USAGE}");
             return Ok(());
diff --git a/crates/oxinit-cgroup/Cargo.toml b/crates/oxinit-cgroup/Cargo.toml
index 53433be..ea9419f 100644
--- a/crates/oxinit-cgroup/Cargo.toml
+++ b/crates/oxinit-cgroup/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "oxinit-cgroup"
-version = "0.0.0"
+version.workspace = true
 description = "cgroup v2 hierarchy, limits, accounting, and emptiness"
 edition.workspace = true
 rust-version.workspace = true
diff --git a/crates/oxinit-graph/Cargo.toml b/crates/oxinit-graph/Cargo.toml
index 7dc84d6..f658460 100644
--- a/crates/oxinit-graph/Cargo.toml
+++ b/crates/oxinit-graph/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "oxinit-graph"
-version = "0.0.0"
+version.workspace = true
 description = "Dependency resolution and start ordering"
 edition.workspace = true
 rust-version.workspace = true
diff --git a/crates/oxinit-ipc/Cargo.toml b/crates/oxinit-ipc/Cargo.toml
index a8ed16e..bdf91df 100644
--- a/crates/oxinit-ipc/Cargo.toml
+++ b/crates/oxinit-ipc/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "oxinit-ipc"
-version = "0.0.0"
+version.workspace = true
 description = "Control protocol types, shared by oxinit and oxctl"
 edition.workspace = true
 rust-version.workspace = true
diff --git a/crates/oxinit-log/Cargo.toml b/crates/oxinit-log/Cargo.toml
index d119035..a6b73f6 100644
--- a/crates/oxinit-log/Cargo.toml
+++ b/crates/oxinit-log/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "oxinit-log"
-version = "0.0.0"
+version.workspace = true
 description = "Log record format, line splitting, and rotation policy"
 edition.workspace = true
 rust-version.workspace = true
diff --git a/crates/oxinit-service/Cargo.toml b/crates/oxinit-service/Cargo.toml
index 3d4e15a..8d8fd15 100644
--- a/crates/oxinit-service/Cargo.toml
+++ b/crates/oxinit-service/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "oxinit-service"
-version = "0.0.0"
+version.workspace = true
 description = "Service state machine and restart policy"
 edition.workspace = true
 rust-version.workspace = true
diff --git a/crates/oxinit-timer/Cargo.toml b/crates/oxinit-timer/Cargo.toml
index 30a01d2..fcf3d0e 100644
--- a/crates/oxinit-timer/Cargo.toml
+++ b/crates/oxinit-timer/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "oxinit-timer"
-version = "0.0.0"
+version.workspace = true
 description = "Timer schedules and the calendar arithmetic behind them"
 edition.workspace = true
 rust-version.workspace = true
diff --git a/crates/oxinit-unit/Cargo.toml b/crates/oxinit-unit/Cargo.toml
index d5a8b23..7b22829 100644
--- a/crates/oxinit-unit/Cargo.toml
+++ b/crates/oxinit-unit/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "oxinit-unit"
-version = "0.0.0"
+version.workspace = true
 description = "Unit file parsing and validation"
 edition.workspace = true
 rust-version.workspace = true
diff --git a/crates/oxinit-user/Cargo.toml b/crates/oxinit-user/Cargo.toml
index 4fe0ea1..f109580 100644
--- a/crates/oxinit-user/Cargo.toml
+++ b/crates/oxinit-user/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "oxinit-user"
-version = "0.0.0"
+version.workspace = true
 description = "Resolving a username against /etc/passwd and /etc/group"
 edition.workspace = true
 rust-version.workspace = true
diff --git a/crates/oxinit/Cargo.toml b/crates/oxinit/Cargo.toml
index ca90a57..0cd386b 100644
--- a/crates/oxinit/Cargo.toml
+++ b/crates/oxinit/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "oxinit"
-version = "0.0.0"
+version.workspace = true
 description = "PID 1 and service manager"
 edition.workspace = true
 rust-version.workspace = true
diff --git a/crates/oxinit/src/main.rs b/crates/oxinit/src/main.rs
index 711beb5..d6037ab 100644
--- a/crates/oxinit/src/main.rs
+++ b/crates/oxinit/src/main.rs
@@ -84,6 +84,14 @@ const SIGUSR2: u32 = libc::SIGUSR2 as u32;
 const SIGPWR: u32 = libc::SIGPWR as u32;
 
 fn main() -> ExitCode {
+    // Before the pid check, deliberately. `oxinit --version` has to work for
+    // somebody holding a binary and asking what it is, and that person is
+    // exactly the one who cannot run it as PID 1 to find out.
+    if std::env::args().any(|arg| arg == "--version" || arg == "-V") {
+        println!("oxinit {}", env!("CARGO_PKG_VERSION"));
+        return ExitCode::SUCCESS;
+    }
+
     if !rustix::process::getpid().is_init() {
         eprintln!(
             "oxinit: running as pid {}, not 1. oxinit is an init system; \
diff --git a/crates/oxlogd/Cargo.toml b/crates/oxlogd/Cargo.toml
index 99ace6d..6bee6ec 100644
--- a/crates/oxlogd/Cargo.toml
+++ b/crates/oxlogd/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "oxlogd"
-version = "0.0.0"
+version.workspace = true
 description = "Reads service output and writes it"
 edition.workspace = true
 rust-version.workspace = true
diff --git a/crates/oxlogd/src/main.rs b/crates/oxlogd/src/main.rs
index e984119..dfa37b5 100644
--- a/crates/oxlogd/src/main.rs
+++ b/crates/oxlogd/src/main.rs
@@ -55,6 +55,11 @@ fn main() -> ExitCode {
 }
 
 fn run() -> Result<(), String> {
+    if std::env::args().any(|arg| arg == "--version" || arg == "-V") {
+        println!("oxlogd {}", env!("CARGO_PKG_VERSION"));
+        return Ok(());
+    }
+
     let dir = std::env::args()
         .skip_while(|arg| arg != "--dir")
         .nth(1)
diff --git a/crates/xtask/Cargo.toml b/crates/xtask/Cargo.toml
index 1669f6f..c6d7d68 100644
--- a/crates/xtask/Cargo.toml
+++ b/crates/xtask/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "xtask"
-version = "0.0.0"
+version.workspace = true
 description = "Build and boot automation"
 edition.workspace = true
 rust-version.workspace = true