diff --git a/.devcontainer/devcontainer.json b/.devcontainer/devcontainer.json
index 139abbc26c1..a2708375e9d 100644
--- a/.devcontainer/devcontainer.json
+++ b/.devcontainer/devcontainer.json
@@ -1,10 +1,10 @@
 {
   "name": "Actions Runner Devcontainer",
-  "image": "mcr.microsoft.com/devcontainers/base:focal",
+  "image": "mcr.microsoft.com/devcontainers/base:noble",
   "features": {
     "ghcr.io/devcontainers/features/docker-in-docker:1": {},
     "ghcr.io/devcontainers/features/dotnet": {
-      "version": "8.0.404"
+      "version": "9.0.100"
     },
     "ghcr.io/devcontainers/features/node:1": {
       "version": "20"
diff --git a/docs/checks/sslcert.md b/docs/checks/sslcert.md
index 2ab09b722d2..969314e9e69 100644
--- a/docs/checks/sslcert.md
+++ b/docs/checks/sslcert.md
@@ -41,7 +41,7 @@ To let the runner trusts your CA certificate, you will need to:
     - macOS: ![trust ca cert](./../res/macOStrustCA.gif)
     - Linux: Refer to the distribution documentation
       1. RedHat: https://www.redhat.com/sysadmin/ca-certificates-cli
-      2. Ubuntu: http://manpages.ubuntu.com/manpages/focal/man8/update-ca-certificates.8.html
+      2. Ubuntu: https://manpages.ubuntu.com/manpages/noble/man8/update-ca-certificates.8.html
       3. Google search: "trust ca certificate on [linux distribution]"
       4. If all approaches failed, set environment variable `SSL_CERT_FILE` to the CA bundle `.pem` file we get.
     > To verify cert gets installed properly on Linux, you can try use `curl -v https://sitewithsslissue.com` and `pwsh -Command \"Invoke-WebRequest -Uri https://sitewithsslissue.com\"`
diff --git a/images/Dockerfile b/images/Dockerfile
index 50b4a6b2d27..a3968c05608 100644
--- a/images/Dockerfile
+++ b/images/Dockerfile
@@ -1,5 +1,5 @@
 # Source: https://github.com/dotnet/dotnet-docker
-FROM mcr.microsoft.com/dotnet/runtime-deps:8.0-jammy as build
+FROM mcr.microsoft.com/dotnet/runtime-deps:9.0-noble as build
 
 ARG TARGETOS
 ARG TARGETARCH
@@ -32,7 +32,7 @@ RUN export RUNNER_ARCH=${TARGETARCH} \
         "https://github.com/docker/buildx/releases/download/v${BUILDX_VERSION}/buildx-v${BUILDX_VERSION}.linux-${TARGETARCH}" \
     && chmod +x /usr/local/lib/docker/cli-plugins/docker-buildx
 
-FROM mcr.microsoft.com/dotnet/runtime-deps:8.0-jammy
+FROM mcr.microsoft.com/dotnet/runtime-deps:9.0-noble
 
 ENV DEBIAN_FRONTEND=noninteractive
 ENV RUNNER_MANUALLY_TRAP_SIG=1
diff --git a/src/Runner.Common/Runner.Common.csproj b/src/Runner.Common/Runner.Common.csproj
index 6c4635626a2..2aba53e07f8 100644
--- a/src/Runner.Common/Runner.Common.csproj
+++ b/src/Runner.Common/Runner.Common.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>net8.0</TargetFramework>
+    <TargetFramework>net9.0</TargetFramework>
     <OutputType>Library</OutputType>
     <RuntimeIdentifiers>win-x64;win-x86;linux-x64;linux-arm64;linux-arm;osx-x64;osx-arm64;win-arm64</RuntimeIdentifiers>
     <TargetLatestRuntimePatch>true</TargetLatestRuntimePatch>
@@ -17,7 +17,7 @@
   <ItemGroup>
     <PackageReference Include="Microsoft.Win32.Registry" Version="5.0.0" />
     <PackageReference Include="Newtonsoft.Json" Version="13.0.3" />
-    <PackageReference Include="System.Security.Cryptography.ProtectedData" Version="8.0.0" />
+    <PackageReference Include="System.Security.Cryptography.ProtectedData" Version="9.0.0" />
     <PackageReference Include="System.Text.Encoding.CodePages" Version="8.0.0" />
     <PackageReference Include="System.Threading.Channels" Version="8.0.0" />
   </ItemGroup>
diff --git a/src/Runner.Listener/Runner.Listener.csproj b/src/Runner.Listener/Runner.Listener.csproj
index afd528128a5..3a15a89dc14 100644
--- a/src/Runner.Listener/Runner.Listener.csproj
+++ b/src/Runner.Listener/Runner.Listener.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>net8.0</TargetFramework>
+    <TargetFramework>net9.0</TargetFramework>
     <OutputType>Exe</OutputType>
     <RuntimeIdentifiers>win-x64;win-x86;linux-x64;linux-arm64;linux-arm;osx-x64;osx-arm64;win-arm64</RuntimeIdentifiers>
     <SelfContained>true</SelfContained>
@@ -22,7 +22,7 @@
     <PackageReference Include="Microsoft.Win32.Registry" Version="5.0.0" />
     <PackageReference Include="Newtonsoft.Json" Version="13.0.3" />
     <PackageReference Include="System.IO.FileSystem.AccessControl" Version="5.0.0" />
-    <PackageReference Include="System.Security.Cryptography.ProtectedData" Version="8.0.0" />
+    <PackageReference Include="System.Security.Cryptography.ProtectedData" Version="9.0.0" />
     <PackageReference Include="System.ServiceProcess.ServiceController" Version="8.0.0" />
   </ItemGroup>
 
diff --git a/src/Runner.PluginHost/Runner.PluginHost.csproj b/src/Runner.PluginHost/Runner.PluginHost.csproj
index 81a8d2e4304..49272a23405 100644
--- a/src/Runner.PluginHost/Runner.PluginHost.csproj
+++ b/src/Runner.PluginHost/Runner.PluginHost.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>net8.0</TargetFramework>
+    <TargetFramework>net9.0</TargetFramework>
     <OutputType>Exe</OutputType>
     <RuntimeIdentifiers>win-x64;win-x86;linux-x64;linux-arm64;linux-arm;osx-x64;osx-arm64;win-arm64</RuntimeIdentifiers>
     <SelfContained>true</SelfContained>
diff --git a/src/Runner.Plugins/Runner.Plugins.csproj b/src/Runner.Plugins/Runner.Plugins.csproj
index a786cf1cd1b..60d7662b7f7 100644
--- a/src/Runner.Plugins/Runner.Plugins.csproj
+++ b/src/Runner.Plugins/Runner.Plugins.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>net8.0</TargetFramework>
+    <TargetFramework>net9.0</TargetFramework>
     <OutputType>Library</OutputType>
     <RuntimeIdentifiers>win-x64;win-x86;linux-x64;linux-arm64;linux-arm;osx-x64;osx-arm64;win-arm64</RuntimeIdentifiers>
     <SelfContained>true</SelfContained>
diff --git a/src/Runner.Sdk/Runner.Sdk.csproj b/src/Runner.Sdk/Runner.Sdk.csproj
index 55dbf12627c..dc3b27349c2 100644
--- a/src/Runner.Sdk/Runner.Sdk.csproj
+++ b/src/Runner.Sdk/Runner.Sdk.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>net8.0</TargetFramework>
+    <TargetFramework>net9.0</TargetFramework>
     <OutputType>Library</OutputType>
     <RuntimeIdentifiers>win-x64;win-x86;linux-x64;linux-arm64;linux-arm;osx-x64;osx-arm64;win-arm64</RuntimeIdentifiers>
     <SelfContained>true</SelfContained>
diff --git a/src/Runner.Worker/Runner.Worker.csproj b/src/Runner.Worker/Runner.Worker.csproj
index 53c1610df3e..5d0b89453f6 100644
--- a/src/Runner.Worker/Runner.Worker.csproj
+++ b/src/Runner.Worker/Runner.Worker.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>net8.0</TargetFramework>
+    <TargetFramework>net9.0</TargetFramework>
     <OutputType>Exe</OutputType>
     <RuntimeIdentifiers>win-x64;win-x86;linux-x64;linux-arm64;linux-arm;osx-x64;osx-arm64;win-arm64</RuntimeIdentifiers>
     <SelfContained>true</SelfContained>
@@ -19,7 +19,7 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="System.Security.Cryptography.ProtectedData" Version="8.0.0" />
+    <PackageReference Include="System.Security.Cryptography.ProtectedData" Version="9.0.0" />
     <PackageReference Include="System.ServiceProcess.ServiceController" Version="8.0.0" />
     <PackageReference Include="System.Threading.Channels" Version="8.0.0" />
     <PackageReference Include="YamlDotNet.Signed" Version="5.3.0" />
diff --git a/src/Sdk/Sdk.csproj b/src/Sdk/Sdk.csproj
index ce7f97c8888..e7b49776195 100644
--- a/src/Sdk/Sdk.csproj
+++ b/src/Sdk/Sdk.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
     <PropertyGroup>
-        <TargetFramework>net8.0</TargetFramework>
+        <TargetFramework>net9.0</TargetFramework>
         <OutputType>Library</OutputType>
         <RuntimeIdentifiers>win-x64;win-x86;linux-x64;linux-arm64;linux-arm;osx-x64;osx-arm64;win-arm64</RuntimeIdentifiers>
         <!-- <SelfContained>true</SelfContained> -->
@@ -18,14 +18,16 @@
         <PackageReference Include="Microsoft.Win32.Registry" Version="5.0.0" />
         <PackageReference Include="Newtonsoft.Json" Version="13.0.3" />
         <PackageReference Include="Microsoft.AspNet.WebApi.Client" Version="6.0.0" />
+        <PackageReference Include="System.Formats.Asn1" Version="9.0.0" />
         <PackageReference Include="System.IdentityModel.Tokens.Jwt" Version="7.5.1" />
         <PackageReference Include="System.Security.Cryptography.Cng" Version="5.0.0" />
-        <PackageReference Include="System.Security.Cryptography.Pkcs" Version="8.0.0" />
-        <PackageReference Include="System.Security.Cryptography.ProtectedData" Version="8.0.0" />
+        <PackageReference Include="System.Security.Cryptography.Pkcs" Version="9.0.0" />
+        <PackageReference Include="System.Security.Cryptography.ProtectedData" Version="9.0.0" />
         <PackageReference Include="Minimatch" Version="2.0.0" />
         <PackageReference Include="YamlDotNet.Signed" Version="5.3.0" />
         <PackageReference Include="System.Net.Http" Version="4.3.4" />
         <PackageReference Include="System.Text.RegularExpressions" Version="4.3.1" />
+        <PackageReference Include="System.Private.Uri" Version="4.3.2" />
     </ItemGroup>
 
     <ItemGroup>
diff --git a/src/Test/Test.csproj b/src/Test/Test.csproj
index aebe242096f..0685192bfa8 100644
--- a/src/Test/Test.csproj
+++ b/src/Test/Test.csproj
@@ -1,6 +1,6 @@
 <Project Sdk="Microsoft.NET.Sdk">
     <PropertyGroup>
-        <TargetFramework>net8.0</TargetFramework>
+        <TargetFramework>net9.0</TargetFramework>
         <RuntimeIdentifiers>win-x64;win-x86;linux-x64;linux-arm64;linux-arm;osx-x64;osx-arm64;win-arm64</RuntimeIdentifiers>
         <TargetLatestRuntimePatch>true</TargetLatestRuntimePatch>
         <NoWarn>NU1701;NU1603;NU1603;xUnit2013;SYSLIB0050;SYSLIB0051</NoWarn>
diff --git a/src/dev.sh b/src/dev.sh
index 8e23366554a..3ae7d0be240 100755
--- a/src/dev.sh
+++ b/src/dev.sh
@@ -17,7 +17,7 @@ LAYOUT_DIR="$SCRIPT_DIR/../_layout"
 DOWNLOAD_DIR="$SCRIPT_DIR/../_downloads/netcore2x"
 PACKAGE_DIR="$SCRIPT_DIR/../_package"
 DOTNETSDK_ROOT="$SCRIPT_DIR/../_dotnetsdk"
-DOTNETSDK_VERSION="8.0.404"
+DOTNETSDK_VERSION="9.0.100"
 DOTNETSDK_INSTALLDIR="$DOTNETSDK_ROOT/$DOTNETSDK_VERSION"
 RUNNER_VERSION=$(cat runnerversion)
 
diff --git a/src/global.json b/src/global.json
index 8c70738ad60..65324522984 100644
--- a/src/global.json
+++ b/src/global.json
@@ -1,5 +1,5 @@
 {
   "sdk": {
-    "version": "8.0.404"
+    "version": "9.0.100"
   }
 }