diff --git a/package.json b/package.json
index 3c91e7f8b..ce16c9d57 100644
--- a/package.json
+++ b/package.json
@@ -39,9 +39,9 @@
 		"*.{js,ts,jsx,tsx,json,jsonc,css}": "biome check --write --no-errors-on-unmatched"
 	},
 	"engines": {
-		"bun": ">=1.2.0"
+		"bun": ">=1.3.7"
 	},
-	"packageManager": "bun@1.3.6",
+	"packageManager": "bun@1.3.7",
 	"version": "0.0.3",
 	"dependencies": {
 		"@sinclair/typebox": "^0.34.46"
diff --git a/packages/coding-agent/package.json b/packages/coding-agent/package.json
index 188ba809e..1373ef012 100644
--- a/packages/coding-agent/package.json
+++ b/packages/coding-agent/package.json
@@ -127,6 +127,6 @@
 		"directory": "packages/coding-agent"
 	},
 	"engines": {
-		"bun": ">=1.0.0"
+		"bun": ">=1.3.7"
 	}
 }
diff --git a/scripts/install.ps1 b/scripts/install.ps1
index b6101772e..9f42f99d9 100644
--- a/scripts/install.ps1
+++ b/scripts/install.ps1
@@ -20,6 +20,7 @@ $Repo = "can1357/oh-my-pi"
 $Package = "@oh-my-pi/pi-coding-agent"
 $InstallDir = if ($env:OMP_INSTALL_DIR) { $env:OMP_INSTALL_DIR } else { "$env:LOCALAPPDATA\omp" }
 $BinaryName = "omp-windows-x64.exe"
+$MinimumBunVersion = "1.3.7"
 
 function Test-BunInstalled {
     try {
@@ -30,6 +31,41 @@ function Test-BunInstalled {
     }
 }
 
+function Get-BunVersion {
+    try {
+        $versionText = (bun --version 2>$null)
+        if (-not $versionText) {
+            return $null
+        }
+
+        $clean = $versionText.Trim().Split("-")[0]
+        return [version]$clean
+    } catch {
+        return $null
+    }
+}
+
+function Test-BunVersion {
+    param([string]$MinimumVersion)
+
+    $currentVersion = Get-BunVersion
+    if (-not $currentVersion) {
+        return $false
+    }
+
+    return $currentVersion -ge [version]$MinimumVersion
+}
+
+function Assert-BunVersion {
+    param([string]$MinimumVersion)
+
+    if (-not (Test-BunVersion $MinimumVersion)) {
+        $current = Get-BunVersion
+        $currentText = if ($current) { $current.ToString() } else { "unknown" }
+        throw "Bun $MinimumVersion or newer is required. Current version: $currentText. Upgrade Bun at https://bun.sh/docs/installation"
+    }
+}
+
 function Test-GitInstalled {
     try {
         $null = Get-Command git -ErrorAction Stop
@@ -129,6 +165,7 @@ function Install-Bun {
     irm bun.sh/install.ps1 | iex
     # Refresh PATH
     $env:Path = [System.Environment]::GetEnvironmentVariable("Path", "User") + ";" + [System.Environment]::GetEnvironmentVariable("Path", "Machine")
+    Assert-BunVersion $MinimumBunVersion
 }
 
 function Install-ViaBun {
@@ -254,12 +291,14 @@ if ($Source) {
     if (-not (Test-BunInstalled)) {
         Install-Bun
     }
+    Assert-BunVersion $MinimumBunVersion
     Install-ViaBun
 } elseif ($Binary) {
     Install-Binary
 } else {
     # Default: use bun if available, otherwise binary
     if (Test-BunInstalled) {
+        Assert-BunVersion $MinimumBunVersion
         Install-ViaBun
     } else {
         Install-Binary
diff --git a/scripts/install.sh b/scripts/install.sh
index 56f21538b..2581d6b09 100755
--- a/scripts/install.sh
+++ b/scripts/install.sh
@@ -13,6 +13,7 @@ set -e
 REPO="can1357/oh-my-pi"
 PACKAGE="@oh-my-pi/pi-coding-agent"
 INSTALL_DIR="${OMP_INSTALL_DIR:-$HOME/.local/bin}"
+MIN_BUN_VERSION="1.3.7"
 
 # Parse arguments
 MODE=""
@@ -70,6 +71,48 @@ has_bun() {
     command -v bun >/dev/null 2>&1
 }
 
+version_ge() {
+    current="$1"
+    minimum="$2"
+
+    IFS=. set -- $current
+    current_major=${1:-0}
+    current_minor=${2:-0}
+    current_patch=${3:-0}
+
+    IFS=. set -- $minimum
+    minimum_major=${1:-0}
+    minimum_minor=${2:-0}
+    minimum_patch=${3:-0}
+
+    if [ "$current_major" -ne "$minimum_major" ]; then
+        [ "$current_major" -gt "$minimum_major" ]
+        return $?
+    fi
+
+    if [ "$current_minor" -ne "$minimum_minor" ]; then
+        [ "$current_minor" -gt "$minimum_minor" ]
+        return $?
+    fi
+
+    [ "$current_patch" -ge "$minimum_patch" ]
+}
+
+require_bun_version() {
+    version_raw=$(bun --version 2>/dev/null || true)
+    if [ -z "$version_raw" ]; then
+        echo "Failed to read bun version"
+        exit 1
+    fi
+
+    version_clean=${version_raw%%-*}
+    if ! version_ge "$version_clean" "$MIN_BUN_VERSION"; then
+        echo "Bun ${MIN_BUN_VERSION} or newer is required. Current version: ${version_clean}"
+        echo "Upgrade Bun at https://bun.sh/docs/installation"
+        exit 1
+    fi
+}
+
 # Check if git is available
 has_git() {
     command -v git >/dev/null 2>&1
@@ -86,6 +129,7 @@ install_bun() {
     fi
     export BUN_INSTALL="$HOME/.bun"
     export PATH="$BUN_INSTALL/bin:$PATH"
+    require_bun_version
 }
 
 # Check if git-lfs is available
@@ -202,6 +246,7 @@ case "$MODE" in
         if ! has_bun; then
             install_bun
         fi
+        require_bun_version
         install_via_bun
         ;;
     binary)
@@ -210,6 +255,7 @@ case "$MODE" in
     *)
         # Default: use bun if available, otherwise binary
         if has_bun; then
+            require_bun_version
             install_via_bun
         else
             install_binary