diff --git a/scripts/update-version.bat b/scripts/update-version.bat
new file mode 100644
index 0000000..2f05e4f
--- /dev/null
+++ b/scripts/update-version.bat
@@ -0,0 +1,54 @@
+@echo off
+rem Update the project version everywhere: Cargo.toml, Cargo.lock,
+rem debian/changelog and packaging/patchsplit.spec.
+rem Usage: scripts\update-version.bat [X.Y.Z]  (prompts for a version if omitted)
+
+cd /d "%~dp0.."
+
+set "VERSION=%~1"
+if not defined VERSION set /p "VERSION=Enter new version (e.g. 1.3.0): "
+
+if not defined VERSION (
+    echo Error: no version entered.
+    exit /b 1
+)
+
+powershell -NoProfile -Command ^
+    "$ErrorActionPreference = 'Stop';" ^
+    "$v = $env:VERSION;" ^
+    "if ($v -notmatch '^[0-9]+\.[0-9]+\.[0-9]+$') { Write-Host ('Error: invalid version: ' + $v + ' (expected X.Y.Z)'); exit 1 };" ^
+    "$debSuffix = '1~ubuntu26.04.1';" ^
+    "$debDist = 'resolute';" ^
+    "$now = Get-Date;" ^
+    "$ci = [Globalization.CultureInfo]::InvariantCulture;" ^
+    "$debDate = [regex]::Replace($now.ToString('ddd, dd MMM yyyy HH:mm:ss zzz', $ci), '([+-]\d{2}):(\d{2})$', '$1$2');" ^
+    "$specDate = $now.ToString('ddd MMM dd yyyy', $ci);" ^
+    "$p = 'Cargo.toml';" ^
+    "$t = [IO.File]::ReadAllText($p);" ^
+    "$t = $t -replace '(?m)^version = \"[^\"]*\"', ('version = \"' + $v + '\"');" ^
+    "[IO.File]::WriteAllText($p, $t);" ^
+    "$p = 'Cargo.lock';" ^
+    "$t = [IO.File]::ReadAllText($p);" ^
+    "$t = $t -replace '(?m)(name = \"patchsplit\"\r?\nversion = \")[^\"]*\"', ('$1' + $v + '\"');" ^
+    "[IO.File]::WriteAllText($p, $t);" ^
+    "$p = 'debian/changelog';" ^
+    "$t = [IO.File]::ReadAllText($p);" ^
+    "$eol = if ($t.Contains([char]13)) { \"`r`n\" } else { \"`n\" };" ^
+    "$entry = 'patchsplit (' + $v + '-' + $debSuffix + ') ' + $debDist + '; urgency=medium' + $eol + $eol + '  *' + $eol + $eol + ' -- Oliver <oliver@liuxiaozhen.dev>  ' + $debDate + $eol + $eol;" ^
+    "[IO.File]::WriteAllText($p, $entry + $t);" ^
+    "$p = 'packaging/patchsplit.spec';" ^
+    "$t = [IO.File]::ReadAllText($p);" ^
+    "$t = $t -replace '(?m)^Version:.*$', ('Version:        ' + $v);" ^
+    "$t = $t -replace ('(?m)^' + [char]37 + 'changelog\r?\n'), ([char]37 + 'changelog' + $eol + '* ' + $specDate + ' Oliver Lin <oliver@liuxiaozhen.dev> - ' + $v + '-1' + $eol + $eol);" ^
+    "[IO.File]::WriteAllText($p, $t);"
+
+if errorlevel 1 (
+    echo Version update failed.
+    exit /b 1
+)
+
+echo Updated to %VERSION%:
+echo   Cargo.toml
+echo   Cargo.lock
+echo   debian/changelog
+echo   packaging/patchsplit.spec
diff --git a/scripts/update-version.sh b/scripts/update-version.sh
new file mode 100755
index 0000000..cc21d33
--- /dev/null
+++ b/scripts/update-version.sh
@@ -0,0 +1,60 @@
+#!/bin/sh
+# Update the project version everywhere: Cargo.toml, Cargo.lock,
+# debian/changelog and packaging/patchsplit.spec.
+# Usage: scripts/update-version.sh [X.Y.Z]  (prompts for a version if omitted)
+set -eu
+
+cd "$(dirname "$0")/.."
+
+if [ $# -ge 1 ]; then
+    version="$1"
+else
+    printf 'Enter new version (e.g. 1.3.0): '
+    read -r version
+fi
+
+printf '%s' "$version" | grep -Eq '^[0-9]+\.[0-9]+\.[0-9]+$' || {
+    printf 'Error: invalid version: %s (expected X.Y.Z)\n' "$version" >&2
+    exit 1
+}
+
+deb_suffix="1~ubuntu26.04.1"
+deb_dist="resolute"
+deb_maintainer="Oliver <oliver@liuxiaozhen.dev>"
+rpm_maintainer="Oliver Lin <oliver@liuxiaozhen.dev>"
+
+deb_date="$(LC_ALL=C date -R)"
+rpm_date="$(LC_ALL=C date '+%a %b %d %Y')"
+
+# Cargo.toml
+sed -i "s/^version = .*/version = \"$version\"/" Cargo.toml
+
+# Cargo.lock (version line right after the patchsplit package entry)
+sed -i "/^name = \"patchsplit\"\$/{n;s/^version = .*/version = \"$version\"/;}" Cargo.lock
+
+tmp="$(mktemp)"
+trap 'rm -f "$tmp"' EXIT
+
+# debian/changelog: new entry on top, content left empty
+{
+    printf 'patchsplit (%s-%s) %s; urgency=medium\n\n  *\n\n -- %s  %s\n\n' \
+        "$version" "$deb_suffix" "$deb_dist" "$deb_maintainer" "$deb_date"
+    cat debian/changelog
+} > "$tmp"
+mv "$tmp" debian/changelog
+
+# packaging/patchsplit.spec: Version field + new %changelog entry (content left empty)
+sed -i "s/^Version:.*/Version:        $version/" packaging/patchsplit.spec
+awk -v v="$version" -v d="$rpm_date" -v m="$rpm_maintainer" '
+    /^%changelog$/ && !done {
+        print
+        printf "* %s %s - %s-1\n", d, m, v
+        print ""
+        done = 1
+        next
+    }
+    { print }
+' packaging/patchsplit.spec > "$tmp"
+mv "$tmp" packaging/patchsplit.spec
+
+printf 'Updated to %s:\n  Cargo.toml\n  Cargo.lock\n  debian/changelog\n  packaging/patchsplit.spec\n' "$version"