diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 8697dd2..fa568d8 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -29,7 +29,7 @@ jobs:
   ci:
     uses: nanvix/workflows/.github/workflows/nanvix-ci.yml@v2.0.1
     with:
-      zutil-version: "v0.8.2"
+      zutil-version: "v0.8.5"
       platforms: "[\"microvm\"]"
       process-modes: "[\"standalone\"]"
       memory-sizes: "[\"256mb\"]"
diff --git a/.nanvix/nanvix.toml b/.nanvix/nanvix.toml
index 958dd91..6b03cb6 100644
--- a/.nanvix/nanvix.toml
+++ b/.nanvix/nanvix.toml
@@ -1,7 +1,7 @@
 [package]
 name = "nanvix-python"
 version = "3.12.3"
-nanvix-version = "0.12.547"
+nanvix-version = "0.13.16"
 
 [builds]
 [builds.matrix]
diff --git a/z.ps1 b/z.ps1
index 452d53d..0baaa92 100644
--- a/z.ps1
+++ b/z.ps1
@@ -1,168 +1,168 @@
-# Copyright(c) The Maintainers of Nanvix.
-# Licensed under the MIT License.
-
-# Thin wrapper that delegates to the nanvix-zutil CLI.
-# Self-bootstraps nanvix-zutil into .nanvix\venv\ if it is not already installed.
-
-param(
-    [Parameter(ValueFromRemainingArguments = $true)]
-    [string[]]$ZArgs
-)
-
-$ErrorActionPreference = 'Stop'
-
-$zutilVersion = if ($env:NANVIX_ZUTIL_VERSION) {
-    $env:NANVIX_ZUTIL_VERSION
-}
-else {
-    "0.8.2"
-}
-$zutilVersion = $zutilVersion -replace "^v", ""
-
-# z.ps1 lives at the repository root, so use its directory directly
-# instead of relying on git to discover the top-level checkout directory.
-$repoRoot = $PSScriptRoot
-$venvDir = Join-Path $repoRoot ".nanvix\venv"
-$venvPython = Join-Path $venvDir "Scripts\python.exe"
-$venvZutil = Join-Path $venvDir "Scripts\nanvix-zutil.exe"
-
-# Windows compatibility shim: nanvix-zutil references os.getuid/os.getgid
-# which are unavailable on Windows.  Stub them before importing the package.
-# NOTE: Use single quotes inside the Python code so that PowerShell does not
-# strip the quotes when passing the string to python.exe -c.
-$ShimCode = @'
-import os,sys;os.getuid=getattr(os,'getuid',lambda:0);os.getgid=getattr(os,'getgid',lambda:0);from nanvix_zutil.__main__ import main;sys.exit(main())
-'@
-
-$zutilGlobalVersion = try {
-    & nanvix-zutil --version 2>$null
-}
-catch {
-    $null
-}
-
-function Bootstrap {
-    # Pin nanvix-zutil version for reproducible bootstrapping.
-    # Override with NANVIX_ZUTIL_VERSION env var if needed.
-    Write-Information "nanvix-zutil not found -- bootstrapping nanvix-zutil==${zutilVersion}..." -InformationAction Continue
-
-    $wheelUrl = "https://github.com/nanvix/zutils/releases/download/v${zutilVersion}/nanvix_zutil-${zutilVersion}-py3-none-any.whl"
-
-    # Discover a Python 3 interpreter.
-    $venvArgs = @("-m", "venv")
-    if (Test-Path $venvDir) {
-        $venvArgs += "--clear"
-    }
-    $venvArgs += $venvDir
-
-    if (Get-Command py -ErrorAction SilentlyContinue) {
-        & py -3 @venvArgs
-    }
-    elseif (Get-Command python -ErrorAction SilentlyContinue) {
-        & python @venvArgs
-    }
-    elseif (Get-Command python3 -ErrorAction SilentlyContinue) {
-        & python3 @venvArgs
-    }
-    else {
-        throw "Python 3 not found. Install Python 3 and ensure py, python, or python3 is on PATH."
-    }
-    if ($LASTEXITCODE -and $LASTEXITCODE -ne 0) {
-        throw "venv creation failed (exit code $LASTEXITCODE)"
-    }
-    & $venvPython -m pip install --quiet "nanvix-zutil[lint] @ $($wheelUrl)"
-    if ($LASTEXITCODE -and $LASTEXITCODE -ne 0) {
-        throw "pip install failed (exit code $LASTEXITCODE)"
-    }
-}
-
-# Prefer the venv copy if it exists; otherwise use the global install.
-$bin = $null
-if ((-not (Test-Path $venvDir)) -and (-not $zutilGlobalVersion)) {
-    Bootstrap
-    if (-not (Test-Path $venvZutil)) {
-        throw "Bootstrap completed but $venvZutil not found."
-    }
-    $bin = $venvZutil
-}
-elseif (Test-Path $venvZutil) {
-    # Use the shim to check version -- running the exe directly fails on
-    # Windows because os.getuid/os.getgid are unavailable (see FIXME above).
-    $venvVersion = try {
-        & $venvPython -c $ShimCode --version 2>$null
-    }
-    catch {
-        $null
-    }
-    if ($venvVersion -ne "nanvix-zutil ${zutilVersion}") {
-        Write-Warning "Venv nanvix-zutil version mismatch. Expected ${zutilVersion}, found ${venvVersion}. Re-bootstrapping..."
-        Bootstrap
-        if (-not (Test-Path $venvZutil)) {
-            throw "Bootstrap completed but $venvZutil not found."
-        }
-    }
-    $bin = $venvZutil
-}
-elseif ((Test-Path $venvDir) -and (-not $zutilGlobalVersion)) {
-    Write-Warning "Incomplete venv detected (binary missing). Re-running bootstrap..."
-    Bootstrap
-    if (-not (Test-Path $venvZutil)) {
-        throw "Bootstrap completed but $venvZutil not found."
-    }
-    $bin = $venvZutil
-}
-else {
-    $bin = "nanvix-zutil"
-    if ($zutilGlobalVersion -ne "nanvix-zutil ${zutilVersion}") {
-        Write-Warning "nanvix-zutil global install does not match expected version. Expected ${zutilVersion}, found ${zutilGlobalVersion}."
-    }
-}
-
-# Extract --with-nanvix PATH before forwarding to nanvix-zutil.
-$filteredArgs = [System.Collections.Generic.List[string]]::new()
-$i = 0
-while ($i -lt $ZArgs.Count) {
-    if ($ZArgs[$i] -eq '--with-nanvix') {
-        if ($i + 1 -ge $ZArgs.Count) {
-            throw "ERROR: --with-nanvix requires a path argument"
-        }
-        $item = Get-Item -LiteralPath $ZArgs[$i + 1] -ErrorAction Stop
-        if (-not $item.PSIsContainer) {
-            throw "ERROR: --with-nanvix path is not a directory: $($ZArgs[$i + 1])"
-        }
-        $env:WITH_NANVIX = $item.FullName
-        $i += 2
-    }
-    elseif ($ZArgs[$i] -match '^--with-nanvix=(.+)$') {
-        $item = Get-Item -LiteralPath $Matches[1] -ErrorAction Stop
-        if (-not $item.PSIsContainer) {
-            throw "ERROR: --with-nanvix path is not a directory: $($Matches[1])"
-        }
-        $env:WITH_NANVIX = $item.FullName
-        $i++
-    }
-    else {
-        $filteredArgs.Add($ZArgs[$i])
-        $i++
-    }
-}
-
-$filteredArray = $filteredArgs.ToArray()
-
-if ($bin -eq $venvZutil) {
-    & $venvPython -c $ShimCode @filteredArray
-}
-else {
-    & $bin @filteredArray
-}
-
-$ec = $LASTEXITCODE
-
-# On Windows the venv's python.exe is locked while it runs, so the Python
-# distclean command cannot delete it.  Now that the interpreter has exited the
-# lock is released and the shell can safely remove the venv directory.
-if ($filteredArray -and $filteredArray[0] -eq "distclean" -and (Test-Path $venvDir)) {
-    Remove-Item $venvDir -Recurse -Force -ErrorAction SilentlyContinue
-}
-
-exit $ec
+# Copyright(c) The Maintainers of Nanvix.
+# Licensed under the MIT License.
+
+# Thin wrapper that delegates to the nanvix-zutil CLI.
+# Self-bootstraps nanvix-zutil into .nanvix\venv\ if it is not already installed.
+
+param(
+    [Parameter(ValueFromRemainingArguments = $true)]
+    [string[]]$ZArgs
+)
+
+$ErrorActionPreference = 'Stop'
+
+$zutilVersion = if ($env:NANVIX_ZUTIL_VERSION) {
+    $env:NANVIX_ZUTIL_VERSION
+}
+else {
+    "0.8.5"
+}
+$zutilVersion = $zutilVersion -replace "^v", ""
+
+# z.ps1 lives at the repository root, so use its directory directly
+# instead of relying on git to discover the top-level checkout directory.
+$repoRoot = $PSScriptRoot
+$venvDir = Join-Path $repoRoot ".nanvix\venv"
+$venvPython = Join-Path $venvDir "Scripts\python.exe"
+$venvZutil = Join-Path $venvDir "Scripts\nanvix-zutil.exe"
+
+# Windows compatibility shim: nanvix-zutil references os.getuid/os.getgid
+# which are unavailable on Windows.  Stub them before importing the package.
+# NOTE: Use single quotes inside the Python code so that PowerShell does not
+# strip the quotes when passing the string to python.exe -c.
+$ShimCode = @'
+import os,sys;os.getuid=getattr(os,'getuid',lambda:0);os.getgid=getattr(os,'getgid',lambda:0);from nanvix_zutil.__main__ import main;sys.exit(main())
+'@
+
+$zutilGlobalVersion = try {
+    & nanvix-zutil --version 2>$null
+}
+catch {
+    $null
+}
+
+function Bootstrap {
+    # Pin nanvix-zutil version for reproducible bootstrapping.
+    # Override with NANVIX_ZUTIL_VERSION env var if needed.
+    Write-Information "nanvix-zutil not found -- bootstrapping nanvix-zutil==${zutilVersion}..." -InformationAction Continue
+
+    $wheelUrl = "https://github.com/nanvix/zutils/releases/download/v${zutilVersion}/nanvix_zutil-${zutilVersion}-py3-none-any.whl"
+
+    # Discover a Python 3 interpreter.
+    $venvArgs = @("-m", "venv")
+    if (Test-Path $venvDir) {
+        $venvArgs += "--clear"
+    }
+    $venvArgs += $venvDir
+
+    if (Get-Command py -ErrorAction SilentlyContinue) {
+        & py -3 @venvArgs
+    }
+    elseif (Get-Command python -ErrorAction SilentlyContinue) {
+        & python @venvArgs
+    }
+    elseif (Get-Command python3 -ErrorAction SilentlyContinue) {
+        & python3 @venvArgs
+    }
+    else {
+        throw "Python 3 not found. Install Python 3 and ensure py, python, or python3 is on PATH."
+    }
+    if ($LASTEXITCODE -and $LASTEXITCODE -ne 0) {
+        throw "venv creation failed (exit code $LASTEXITCODE)"
+    }
+    & $venvPython -m pip install --quiet "nanvix-zutil[lint] @ $($wheelUrl)"
+    if ($LASTEXITCODE -and $LASTEXITCODE -ne 0) {
+        throw "pip install failed (exit code $LASTEXITCODE)"
+    }
+}
+
+# Prefer the venv copy if it exists; otherwise use the global install.
+$bin = $null
+if ((-not (Test-Path $venvDir)) -and (-not $zutilGlobalVersion)) {
+    Bootstrap
+    if (-not (Test-Path $venvZutil)) {
+        throw "Bootstrap completed but $venvZutil not found."
+    }
+    $bin = $venvZutil
+}
+elseif (Test-Path $venvZutil) {
+    # Use the shim to check version -- running the exe directly fails on
+    # Windows because os.getuid/os.getgid are unavailable (see FIXME above).
+    $venvVersion = try {
+        & $venvPython -c $ShimCode --version 2>$null
+    }
+    catch {
+        $null
+    }
+    if ($venvVersion -ne "nanvix-zutil ${zutilVersion}") {
+        Write-Warning "Venv nanvix-zutil version mismatch. Expected ${zutilVersion}, found ${venvVersion}. Re-bootstrapping..."
+        Bootstrap
+        if (-not (Test-Path $venvZutil)) {
+            throw "Bootstrap completed but $venvZutil not found."
+        }
+    }
+    $bin = $venvZutil
+}
+elseif ((Test-Path $venvDir) -and (-not $zutilGlobalVersion)) {
+    Write-Warning "Incomplete venv detected (binary missing). Re-running bootstrap..."
+    Bootstrap
+    if (-not (Test-Path $venvZutil)) {
+        throw "Bootstrap completed but $venvZutil not found."
+    }
+    $bin = $venvZutil
+}
+else {
+    $bin = "nanvix-zutil"
+    if ($zutilGlobalVersion -ne "nanvix-zutil ${zutilVersion}") {
+        Write-Warning "nanvix-zutil global install does not match expected version. Expected ${zutilVersion}, found ${zutilGlobalVersion}."
+    }
+}
+
+# Extract --with-nanvix PATH before forwarding to nanvix-zutil.
+$filteredArgs = [System.Collections.Generic.List[string]]::new()
+$i = 0
+while ($i -lt $ZArgs.Count) {
+    if ($ZArgs[$i] -eq '--with-nanvix') {
+        if ($i + 1 -ge $ZArgs.Count) {
+            throw "ERROR: --with-nanvix requires a path argument"
+        }
+        $item = Get-Item -LiteralPath $ZArgs[$i + 1] -ErrorAction Stop
+        if (-not $item.PSIsContainer) {
+            throw "ERROR: --with-nanvix path is not a directory: $($ZArgs[$i + 1])"
+        }
+        $env:WITH_NANVIX = $item.FullName
+        $i += 2
+    }
+    elseif ($ZArgs[$i] -match '^--with-nanvix=(.+)$') {
+        $item = Get-Item -LiteralPath $Matches[1] -ErrorAction Stop
+        if (-not $item.PSIsContainer) {
+            throw "ERROR: --with-nanvix path is not a directory: $($Matches[1])"
+        }
+        $env:WITH_NANVIX = $item.FullName
+        $i++
+    }
+    else {
+        $filteredArgs.Add($ZArgs[$i])
+        $i++
+    }
+}
+
+$filteredArray = $filteredArgs.ToArray()
+
+if ($bin -eq $venvZutil) {
+    & $venvPython -c $ShimCode @filteredArray
+}
+else {
+    & $bin @filteredArray
+}
+
+$ec = $LASTEXITCODE
+
+# On Windows the venv's python.exe is locked while it runs, so the Python
+# distclean command cannot delete it.  Now that the interpreter has exited the
+# lock is released and the shell can safely remove the venv directory.
+if ($filteredArray -and $filteredArray[0] -eq "distclean" -and (Test-Path $venvDir)) {
+    Remove-Item $venvDir -Recurse -Force -ErrorAction SilentlyContinue
+}
+
+exit $ec
diff --git a/z.sh b/z.sh
index 2f094f3..12a998d 100755
--- a/z.sh
+++ b/z.sh
@@ -7,7 +7,7 @@
 
 set -euo pipefail
 
-PINNED_VERSION="0.8.2"
+PINNED_VERSION="0.8.5"
 RAW_ZUTIL_VERSION="${NANVIX_ZUTIL_VERSION:-$PINNED_VERSION}"
 ZUTIL_VERSION="${RAW_ZUTIL_VERSION#v}"
 REPO_ROOT="$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")" >/dev/null 2>&1 && pwd -P)"