diff --git a/Build.ps1 b/Build.ps1
index 5f8710c..c9db75f 100644
--- a/Build.ps1
+++ b/Build.ps1
@@ -89,6 +89,20 @@ function Main {
         Write-Host "Building for $Version..."
         Build-FromSource $Version
     } else {
+        $latestTag = git tag --sort=-creatordate | Select-Object -First 1
+        $latestTagTime = [int](git log -1 $latestTag --format=%at 2>&1 | Where-Object { $_ -match '^\d+$' })
+
+        $currentBuildTime = if ($buildFiles = Get-ChildItem -Path "build/avante_html2md*" -ErrorAction SilentlyContinue) {
+            [long](($buildFiles | ForEach-Object { $_.LastWriteTime } |
+                Measure-Object -Maximum).Maximum.Subtract([datetime]'1970-01-01').TotalSeconds)
+        } else {
+            $latestTagTime
+        }
+
+        if ($latestTagTime -lt $currentBuildTime) {
+            Write-Host "Local build is up to date. No download needed."
+            return
+        }
         Write-Host "Downloading for $Version..."
         Download-Prebuilt $Version
     }
diff --git a/build.sh b/build.sh
index 6c79c9a..6e5c032 100644
--- a/build.sh
+++ b/build.sh
@@ -66,9 +66,12 @@ if [ ! -d "$TARGET_DIR" ]; then
     mkdir -p "$TARGET_DIR"
 fi
 
-if test_command "gh" && test_gh_auth; then
+latest_tag_time=$(git tag --sort=-creatordate | xargs git log -1 --format=%at)
+current_build_time=$(stat -c %Y build/avante_html2md* 2>/dev/null || echo "$latest_tag_time")
+if [[ "$latest_tag_time" -ge "$current_build_time" ]]; then
+  if test_command "gh" && test_gh_auth; then
     gh release download --repo "github.com/$REPO_OWNER/$REPO_NAME" --pattern "*$ARTIFACT_NAME_PATTERN*" --clobber --output - | tar -zxv -C "$TARGET_DIR"
-else
+  else
     # Get the artifact download URL
     ARTIFACT_URL=$(curl -s "https://api.github.com/repos/$REPO_OWNER/$REPO_NAME/releases/latest" | grep "browser_download_url" | cut -d '"' -f 4 | grep $ARTIFACT_NAME_PATTERN)
 
@@ -77,4 +80,7 @@ else
     mkdir -p "$TARGET_DIR"
 
     curl -L "$ARTIFACT_URL" | tar -zxv -C "$TARGET_DIR"
+  fi
+else
+  echo "Local build is up to date. No download needed."
 fi