diff --git a/.github/workflows/build-cli.yml b/.github/workflows/build-cli.yml
index f64efb46..d3741523 100644
--- a/.github/workflows/build-cli.yml
+++ b/.github/workflows/build-cli.yml
@@ -35,7 +35,7 @@ jobs:
     - name: Setup .NET
       uses: actions/setup-dotnet@v4
       with:
-        dotnet-version: 10.0.x
+        dotnet-version: 9.0.x
         
     - name: Restore dependencies
       run: dotnet restore src/ExcelMcp.CLI/ExcelMcp.CLI.csproj
@@ -46,13 +46,13 @@ jobs:
     - name: Verify CLI build
       run: |
         # Check excelcli main executable
-        if (Test-Path "src/ExcelMcp.CLI/bin/Release/net10.0/excelcli.exe") {
+        if (Test-Path "src/ExcelMcp.CLI/bin/Release/net9.0/excelcli.exe") {
           Write-Output "✅ excelcli.exe built successfully"
-          $version = (Get-Item "src/ExcelMcp.CLI/bin/Release/net10.0/excelcli.exe").VersionInfo.FileVersion
+          $version = (Get-Item "src/ExcelMcp.CLI/bin/Release/net9.0/excelcli.exe").VersionInfo.FileVersion
           Write-Output "Version: $version"
           
           # Test CLI help command (safe - no Excel COM required)
-          $helpOutput = & "src/ExcelMcp.CLI/bin/Release/net10.0/excelcli.exe" --help
+          $helpOutput = & "src/ExcelMcp.CLI/bin/Release/net9.0/excelcli.exe" --help
           if ($helpOutput -match "Excel Command Line Interface") {
             Write-Output "✅ CLI help command working"
             Write-Output "📋 Help output preview: $($helpOutput | Select-Object -First 3 | Out-String)"
@@ -78,4 +78,4 @@ jobs:
       uses: actions/upload-artifact@v4
       with:
         name: ExcelMcp-CLI-${{ github.sha }}
-        path: src/ExcelMcp.CLI/bin/Release/net10.0/
\ No newline at end of file
+        path: src/ExcelMcp.CLI/bin/Release/net9.0/
\ No newline at end of file
diff --git a/.github/workflows/build-mcp-server.yml b/.github/workflows/build-mcp-server.yml
index b812577e..088c14d5 100644
--- a/.github/workflows/build-mcp-server.yml
+++ b/.github/workflows/build-mcp-server.yml
@@ -35,7 +35,7 @@ jobs:
     - name: Setup .NET
       uses: actions/setup-dotnet@v4
       with:
-        dotnet-version: 10.0.x
+        dotnet-version: 9.0.x
         
     - name: Restore dependencies
       run: dotnet restore src/ExcelMcp.McpServer/ExcelMcp.McpServer.csproj
@@ -46,13 +46,13 @@ jobs:
     - name: Verify MCP Server build
       run: |
         # Check MCP Server executable
-        if (Test-Path "src/ExcelMcp.McpServer/bin/Release/net10.0/Sbroenne.ExcelMcp.McpServer.exe") {
+        if (Test-Path "src/ExcelMcp.McpServer/bin/Release/net9.0/Sbroenne.ExcelMcp.McpServer.exe") {
           Write-Output "✅ Sbroenne.ExcelMcp.McpServer.exe built successfully"
-          $mcpVersion = (Get-Item "src/ExcelMcp.McpServer/bin/Release/net10.0/Sbroenne.ExcelMcp.McpServer.exe").VersionInfo.FileVersion
+          $mcpVersion = (Get-Item "src/ExcelMcp.McpServer/bin/Release/net9.0/Sbroenne.ExcelMcp.McpServer.exe").VersionInfo.FileVersion
           Write-Output "📦 MCP Server Version: $mcpVersion"
           
           # Check for MCP server.json configuration
-          if (Test-Path "src/ExcelMcp.McpServer/bin/Release/net10.0/.mcp/server.json") {
+          if (Test-Path "src/ExcelMcp.McpServer/bin/Release/net9.0/.mcp/server.json") {
             Write-Output "✅ MCP server.json configuration found"
           } else {
             Write-Warning "⚠️ MCP server.json configuration not found"
@@ -69,4 +69,4 @@ jobs:
       uses: actions/upload-artifact@v4
       with:
         name: ExcelMcp-MCP-Server-${{ github.sha }}
-        path: src/ExcelMcp.McpServer/bin/Release/net10.0/
\ No newline at end of file
+        path: src/ExcelMcp.McpServer/bin/Release/net9.0/
\ No newline at end of file
diff --git a/.github/workflows/codeql.yml b/.github/workflows/codeql.yml
index fee45de8..94831d3b 100644
--- a/.github/workflows/codeql.yml
+++ b/.github/workflows/codeql.yml
@@ -56,7 +56,7 @@ jobs:
     - name: Setup .NET
       uses: actions/setup-dotnet@v4
       with:
-        dotnet-version: 10.0.x
+        dotnet-version: 9.0.x
         
     # Initializes the CodeQL tools for scanning
     - name: Initialize CodeQL
diff --git a/.github/workflows/publish-nuget.yml b/.github/workflows/publish-nuget.yml
index 0d38a272..1a8180e4 100644
--- a/.github/workflows/publish-nuget.yml
+++ b/.github/workflows/publish-nuget.yml
@@ -17,7 +17,7 @@ jobs:
     - name: Setup .NET
       uses: actions/setup-dotnet@v4
       with:
-        dotnet-version: 10.0.x
+        dotnet-version: 9.0.x
         
     - name: Extract version from tag
       id: version
diff --git a/.github/workflows/release-cli.yml b/.github/workflows/release-cli.yml
index 6200e459..d3bbb638 100644
--- a/.github/workflows/release-cli.yml
+++ b/.github/workflows/release-cli.yml
@@ -19,7 +19,7 @@ jobs:
     - name: Setup .NET
       uses: actions/setup-dotnet@v4
       with:
-        dotnet-version: 10.0.x
+        dotnet-version: 9.0.x
         
     - name: Update CLI Version
       run: |
@@ -60,11 +60,11 @@ jobs:
         New-Item -ItemType Directory -Path "release/ExcelMcp-CLI-$version" -Force
         
         # Copy CLI files
-        Copy-Item "src/ExcelMcp.CLI/bin/Release/net10.0/excelcli.exe" "release/ExcelMcp-CLI-$version/"
-        Copy-Item "src/ExcelMcp.CLI/bin/Release/net10.0/excelcli.dll" "release/ExcelMcp-CLI-$version/"
-        Copy-Item "src/ExcelMcp.CLI/bin/Release/net10.0/Sbroenne.ExcelMcp.Core.dll" "release/ExcelMcp-CLI-$version/"
-        Copy-Item "src/ExcelMcp.CLI/bin/Release/net10.0/excelcli.runtimeconfig.json" "release/ExcelMcp-CLI-$version/"
-        Copy-Item "src/ExcelMcp.CLI/bin/Release/net10.0/*.dll" "release/ExcelMcp-CLI-$version/" -Exclude "excelcli.dll", "Sbroenne.ExcelMcp.Core.dll"
+        Copy-Item "src/ExcelMcp.CLI/bin/Release/net9.0/excelcli.exe" "release/ExcelMcp-CLI-$version/"
+        Copy-Item "src/ExcelMcp.CLI/bin/Release/net9.0/excelcli.dll" "release/ExcelMcp-CLI-$version/"
+        Copy-Item "src/ExcelMcp.CLI/bin/Release/net9.0/Sbroenne.ExcelMcp.Core.dll" "release/ExcelMcp-CLI-$version/"
+        Copy-Item "src/ExcelMcp.CLI/bin/Release/net9.0/excelcli.runtimeconfig.json" "release/ExcelMcp-CLI-$version/"
+        Copy-Item "src/ExcelMcp.CLI/bin/Release/net9.0/*.dll" "release/ExcelMcp-CLI-$version/" -Exclude "excelcli.dll", "Sbroenne.ExcelMcp.Core.dll"
         
         # Copy documentation
         Copy-Item "docs/CLI.md" "release/ExcelMcp-CLI-$version/README.md"
@@ -100,7 +100,7 @@ jobs:
         $quickStartContent += "- **GitHub**: https://github.com/sbroenne/mcp-server-excel`n`n"
         $quickStartContent += "## Requirements`n`n"
         $quickStartContent += "- Windows OS with Microsoft Excel installed`n"
-        $quickStartContent += "- .NET 10.0 runtime`n"
+        $quickStartContent += "- .NET 9.0 runtime`n"
         $quickStartContent += "- Excel 2016+ (for COM interop)`n`n"
         $quickStartContent += "## Features`n`n"
         $quickStartContent += "- 40+ Excel automation commands`n"
@@ -162,7 +162,7 @@ jobs:
         $releaseNotes += "``````n`n"
         $releaseNotes += "### Requirements`n"
         $releaseNotes += "- Windows OS with Microsoft Excel installed`n"
-        $releaseNotes += "- .NET 10.0 runtime`n"
+        $releaseNotes += "- .NET 9.0 runtime`n"
         $releaseNotes += "- Excel 2016+ (for COM interop)`n`n"
         $releaseNotes += "### Documentation`n"
         $releaseNotes += "- Complete Command Reference: COMMANDS.md in package`n"
diff --git a/.github/workflows/release-mcp-server.yml b/.github/workflows/release-mcp-server.yml
index 0fbfe5e0..ac10753e 100644
--- a/.github/workflows/release-mcp-server.yml
+++ b/.github/workflows/release-mcp-server.yml
@@ -20,7 +20,7 @@ jobs:
     - name: Setup .NET
       uses: actions/setup-dotnet@v4
       with:
-        dotnet-version: 10.0.x
+        dotnet-version: 9.0.x
         
     - name: Update MCP Server Version
       run: |
@@ -81,7 +81,7 @@ jobs:
         New-Item -ItemType Directory -Path "release/ExcelMcp-MCP-Server-$version" -Force
         
         # Copy MCP Server files
-        Copy-Item "src/ExcelMcp.McpServer/bin/Release/net10.0/*" "release/ExcelMcp-MCP-Server-$version/" -Recurse
+        Copy-Item "src/ExcelMcp.McpServer/bin/Release/net9.0/*" "release/ExcelMcp-MCP-Server-$version/" -Recurse
         
         # Copy documentation
         Copy-Item "README.md" "release/ExcelMcp-MCP-Server-$version/"
@@ -111,7 +111,7 @@ jobs:
         $readmeContent += "- Excel Development Focus - Power Query, VBA, worksheets`n`n"
         $readmeContent += "## Requirements`n`n"
         $readmeContent += "- Windows OS with Microsoft Excel installed`n"
-        $readmeContent += "- .NET 10.0 runtime`n"
+        $readmeContent += "- .NET 9.0 runtime`n"
         $readmeContent += "- Excel 2016+ (for COM interop)`n`n"
         $readmeContent += "## License`n`n"
         $readmeContent += "MIT License - see LICENSE file for details.`n"
@@ -166,7 +166,7 @@ jobs:
         $releaseNotes += "- excel_vba - VBA script management (list, export, import, update, run, delete)`n`n"
         $releaseNotes += "### Requirements`n"
         $releaseNotes += "- Windows OS with Microsoft Excel installed`n"
-        $releaseNotes += "- .NET 10.0 runtime`n"
+        $releaseNotes += "- .NET 9.0 runtime`n"
         $releaseNotes += "- Excel 2016+ (for COM interop)`n`n"
         $releaseNotes += "### Documentation`n"
         $releaseNotes += "- Configuration Guide: See README.md in package`n"
diff --git a/global.json b/global.json
index d03a95c4..f6cd5f7e 100644
--- a/global.json
+++ b/global.json
@@ -1,6 +1,6 @@
 {
   "sdk": {
-    "version": "10.0.100-rc.1.25451.107",
+    "version": "9.0.306",
     "rollForward": "latestFeature"
   }
 }
\ No newline at end of file