diff --git a/crates/plano-cli/src/commands/mod.rs b/crates/plano-cli/src/commands/mod.rs
index 188b577f..380f2a64 100644
--- a/crates/plano-cli/src/commands/mod.rs
+++ b/crates/plano-cli/src/commands/mod.rs
@@ -3,6 +3,7 @@ pub mod cli_agent;
 pub mod down;
 pub mod init;
 pub mod logs;
+pub mod self_update;
 pub mod up;
 
 use clap::{Parser, Subcommand};
@@ -132,6 +133,14 @@ pub enum Command {
         #[arg(long)]
         list_templates: bool,
     },
+
+    /// Update planoai to the latest version
+    #[command(name = "self-update")]
+    SelfUpdate {
+        /// Update to a specific version instead of latest
+        #[arg(long)]
+        version: Option<String>,
+    },
 }
 
 #[derive(Subcommand)]
@@ -252,6 +261,7 @@ pub async fn run(cli: Cli) -> anyhow::Result<()> {
             force,
             list_templates,
         }) => init::run(template, clean, output, force, list_templates).await,
+        Some(Command::SelfUpdate { version }) => self_update::run(version.as_deref()).await,
     }
 }
 
diff --git a/crates/plano-cli/src/commands/self_update.rs b/crates/plano-cli/src/commands/self_update.rs
new file mode 100644
index 00000000..6d9b28ea
--- /dev/null
+++ b/crates/plano-cli/src/commands/self_update.rs
@@ -0,0 +1,139 @@
+use std::fs;
+use std::os::unix::fs::PermissionsExt;
+
+use anyhow::{bail, Result};
+
+use crate::consts::{PLANO_GITHUB_REPO, PLANO_VERSION};
+
+pub async fn run(target_version: Option<&str>) -> Result<()> {
+    let green = console::Style::new().green();
+    let bold = console::Style::new().bold();
+    let dim = console::Style::new().dim();
+    let cyan = console::Style::new().cyan();
+
+    println!(
+        "\n{} {}",
+        bold.apply_to("planoai"),
+        dim.apply_to("self-update")
+    );
+
+    // Determine target version
+    let version = if let Some(v) = target_version {
+        v.to_string()
+    } else {
+        println!("  {}", dim.apply_to("Checking for latest version..."));
+        fetch_latest_version()
+            .await?
+            .ok_or_else(|| anyhow::anyhow!("Could not determine latest version"))?
+    };
+
+    let current = PLANO_VERSION;
+    if version == current && target_version.is_none() {
+        println!(
+            "\n  {} Already up to date ({})",
+            green.apply_to("✓"),
+            cyan.apply_to(current)
+        );
+        return Ok(());
+    }
+
+    println!(
+        "  {} → {}",
+        dim.apply_to(format!("Current: {current}")),
+        cyan.apply_to(&version)
+    );
+
+    // Detect platform
+    let platform = get_platform_slug()?;
+
+    // Download URL
+    let url = format!(
+        "https://github.com/{PLANO_GITHUB_REPO}/releases/download/{version}/planoai-{platform}.gz"
+    );
+
+    println!("  {}", dim.apply_to(format!("Downloading from {url}...")));
+
+    let client = reqwest::Client::new();
+    let resp = client.get(&url).send().await?;
+
+    if !resp.status().is_success() {
+        bail!(
+            "Download failed: HTTP {}. Version {} may not exist for platform {}.",
+            resp.status(),
+            version,
+            platform
+        );
+    }
+
+    let gz_bytes = resp.bytes().await?;
+
+    // Decompress
+    let mut decoder = flate2::read::GzDecoder::new(&gz_bytes[..]);
+    let mut binary_data = Vec::new();
+    std::io::copy(&mut decoder, &mut binary_data)?;
+
+    // Find current binary path
+    let current_exe = std::env::current_exe()?;
+    let exe_path = current_exe.canonicalize()?;
+
+    println!(
+        "  {}",
+        dim.apply_to(format!("Installing to {}", exe_path.display()))
+    );
+
+    // Write to a temp file next to the binary, then atomically rename
+    let tmp_path = exe_path.with_extension("update-tmp");
+    fs::write(&tmp_path, &binary_data)?;
+    fs::set_permissions(&tmp_path, fs::Permissions::from_mode(0o755))?;
+
+    // Atomic replace
+    fs::rename(&tmp_path, &exe_path)?;
+
+    println!(
+        "\n  {} Updated planoai to {}\n",
+        green.apply_to("✓"),
+        bold.apply_to(&version)
+    );
+
+    Ok(())
+}
+
+async fn fetch_latest_version() -> Result<Option<String>> {
+    let url = format!("https://api.github.com/repos/{PLANO_GITHUB_REPO}/releases/latest");
+    let client = reqwest::Client::builder()
+        .timeout(std::time::Duration::from_secs(5))
+        .build()?;
+
+    let resp = client
+        .get(&url)
+        .header("User-Agent", "planoai-cli")
+        .send()
+        .await?;
+
+    if !resp.status().is_success() {
+        return Ok(None);
+    }
+
+    let json: serde_json::Value = resp.json().await?;
+    let tag = json
+        .get("tag_name")
+        .and_then(|v| v.as_str())
+        .map(|s| s.strip_prefix('v').unwrap_or(s).to_string());
+
+    Ok(tag)
+}
+
+fn get_platform_slug() -> Result<&'static str> {
+    let os = std::env::consts::OS;
+    let arch = std::env::consts::ARCH;
+
+    match (os, arch) {
+        ("linux", "x86_64") => Ok("linux-amd64"),
+        ("linux", "aarch64") => Ok("linux-arm64"),
+        ("macos", "aarch64") => Ok("darwin-arm64"),
+        ("macos", "x86_64") => {
+            bail!("macOS x86_64 (Intel) is not supported.")
+        }
+        _ => bail!("Unsupported platform: {os}/{arch}"),
+    }
+}
diff --git a/install.sh b/install.sh
new file mode 100755
index 00000000..019bcfbe
--- /dev/null
+++ b/install.sh
@@ -0,0 +1,132 @@
+#!/bin/bash
+set -euo pipefail
+
+# Plano CLI installer
+# Usage: curl -fsSL https://raw.githubusercontent.com/katanemo/plano/main/install.sh | bash
+
+REPO="katanemo/archgw"
+BINARY_NAME="planoai"
+INSTALL_DIR="${PLANO_INSTALL_DIR:-$HOME/.plano/bin}"
+
+# Colors
+RED='\033[0;31m'
+GREEN='\033[0;32m'
+CYAN='\033[0;36m'
+DIM='\033[2m'
+BOLD='\033[1m'
+RESET='\033[0m'
+
+info()  { echo -e "${GREEN}✓${RESET} $*"; }
+error() { echo -e "${RED}✗${RESET} $*" >&2; }
+dim()   { echo -e "${DIM}$*${RESET}"; }
+
+# Detect platform
+detect_platform() {
+    local os arch
+    os="$(uname -s)"
+    arch="$(uname -m)"
+
+    case "$os" in
+        Linux)  os="linux" ;;
+        Darwin) os="darwin" ;;
+        *)      error "Unsupported OS: $os"; exit 1 ;;
+    esac
+
+    case "$arch" in
+        x86_64)  arch="amd64" ;;
+        aarch64) arch="arm64" ;;
+        arm64)   arch="arm64" ;;
+        *)       error "Unsupported architecture: $arch"; exit 1 ;;
+    esac
+
+    if [ "$os" = "darwin" ] && [ "$arch" = "amd64" ]; then
+        error "macOS x86_64 (Intel) is not supported. Pre-built binaries are only available for Apple Silicon (arm64)."
+        exit 1
+    fi
+
+    echo "${os}-${arch}"
+}
+
+# Get latest version from GitHub releases
+get_latest_version() {
+    local version
+    version=$(curl -fsSL "https://api.github.com/repos/${REPO}/releases/latest" \
+        | grep '"tag_name"' \
+        | sed -E 's/.*"([^"]+)".*/\1/')
+    echo "$version"
+}
+
+main() {
+    echo -e "\n${BOLD}Plano CLI Installer${RESET}\n"
+
+    # Detect platform
+    local platform
+    platform="$(detect_platform)"
+    dim "  Platform: $platform"
+
+    # Get version
+    local version="${PLANO_VERSION:-}"
+    if [ -z "$version" ]; then
+        dim "  Fetching latest version..."
+        version="$(get_latest_version)"
+    fi
+    if [ -z "$version" ]; then
+        error "Could not determine version. Set PLANO_VERSION or check your internet connection."
+        exit 1
+    fi
+    dim "  Version:  $version"
+
+    # Download URL
+    local url="https://github.com/${REPO}/releases/download/${version}/planoai-${platform}.gz"
+    dim "  URL:      $url"
+    echo ""
+
+    # Create install directory
+    mkdir -p "$INSTALL_DIR"
+
+    # Download and extract
+    local tmp_gz
+    tmp_gz="$(mktemp)"
+    echo -e "  ${DIM}Downloading planoai ${version}...${RESET}"
+
+    if ! curl -fSL --progress-bar "$url" -o "$tmp_gz"; then
+        error "Download failed. Check that version $version exists for platform $platform."
+        rm -f "$tmp_gz"
+        exit 1
+    fi
+
+    # Decompress
+    echo -e "  ${DIM}Installing to ${INSTALL_DIR}/${BINARY_NAME}...${RESET}"
+    gzip -d -c "$tmp_gz" > "${INSTALL_DIR}/${BINARY_NAME}"
+    chmod +x "${INSTALL_DIR}/${BINARY_NAME}"
+    rm -f "$tmp_gz"
+
+    info "Installed planoai ${version} to ${INSTALL_DIR}/${BINARY_NAME}"
+
+    # Check if install dir is in PATH
+    if ! echo "$PATH" | tr ':' '\n' | grep -qx "$INSTALL_DIR"; then
+        echo ""
+        echo -e "  ${CYAN}Add to your PATH:${RESET}"
+        local shell_name
+        shell_name="$(basename "${SHELL:-/bin/bash}")"
+        local rc_file
+        case "$shell_name" in
+            zsh)  rc_file="$HOME/.zshrc" ;;
+            fish) rc_file="$HOME/.config/fish/config.fish" ;;
+            *)    rc_file="$HOME/.bashrc" ;;
+        esac
+
+        if [ "$shell_name" = "fish" ]; then
+            echo -e "    ${BOLD}set -gx PATH ${INSTALL_DIR} \$PATH${RESET}"
+        else
+            echo -e "    ${BOLD}export PATH=\"${INSTALL_DIR}:\$PATH\"${RESET}"
+        fi
+        echo -e "  ${DIM}Add this line to ${rc_file} to make it permanent.${RESET}"
+    fi
+
+    echo ""
+    info "Run ${BOLD}planoai --help${RESET} to get started."
+    echo ""
+}
+
+main "$@"