diff --git a/.github/codeql/codeql-config.yml b/.github/codeql/codeql-config.yml
new file mode 100644
index 00000000000..ea1888eed44
--- /dev/null
+++ b/.github/codeql/codeql-config.yml
@@ -0,0 +1,7 @@
+name: "CodeQL config"
+
+paths-ignore:
+  # Upstream ICU source consumed by this fork. MSFT-owned patches live under icu-patches/.
+  - "icu/icu4c/**"
+  # Upstream ICU test data consumed with ICU source.
+  - "icu/testdata/**"
diff --git a/build/dockerfiles/ubuntu-arm64/Dockerfile b/build/dockerfiles/ubuntu-arm64/Dockerfile
index 8366d2d79a1..5f5d8980621 100644
--- a/build/dockerfiles/ubuntu-arm64/Dockerfile
+++ b/build/dockerfiles/ubuntu-arm64/Dockerfile
@@ -1,10 +1,10 @@
-# This uses the .NET Core Ubuntu 16.04 (xenial) Cross-ARM64 docker image to build.
+# This uses the .NET Core Ubuntu 18.04 (bionic) Cross-ARM64 docker image to build.
 # https://github.com/dotnet/dotnet-buildtools-prereqs-docker
 
-FROM mcr.microsoft.com/dotnet-buildtools/prereqs:ubuntu-16.04-cross-arm64-20210106160011-b2c2436
+FROM mcr.microsoft.com/dotnet-buildtools/prereqs:ubuntu-18.04-cross-arm64
 
 LABEL maintainer="Jeff Genovy <29107334+jefgen@users.noreply.github.com>"
-LABEL com.github.microsoft.icu="ubuntu-16.04-cross-arm64"
+LABEL com.github.microsoft.icu="ubuntu-18.04-cross-arm64"
 
 # Remove icu-dev, so it doesn't conflict.
 RUN apt-get -y remove libicu-dev icu-devtools
diff --git a/icu/icu4c/LICENSE b/icu/icu4c/LICENSE
index ea5b60640b0..30cff7403da 120000
--- a/icu/icu4c/LICENSE
+++ b/icu/icu4c/LICENSE
@@ -1 +1 @@
-../LICENSE
\ No newline at end of file
+../../LICENSE
\ No newline at end of file
diff --git a/icu/icu4c/source/allinone/Build.Windows.PlatformToolset.props b/icu/icu4c/source/allinone/Build.Windows.PlatformToolset.props
index 29a9a1d8e6d..c22994b7ef8 100644
--- a/icu/icu4c/source/allinone/Build.Windows.PlatformToolset.props
+++ b/icu/icu4c/source/allinone/Build.Windows.PlatformToolset.props
@@ -14,11 +14,13 @@
       v141 is the Visual Studio 2017 toolset. (15.0)
       v142 is the Visual Studio 2019 toolset. (16.0)
       v143 is the Visual Studio 2022 toolset. (17.0)
+      v145 is the Visual Studio 2026 toolset. (18.0)
     -->
     <AutoDetectedPlatformToolset Condition="'$(BuildToolVersion)'=='14.0'">v140</AutoDetectedPlatformToolset>
     <AutoDetectedPlatformToolset Condition="'$(BuildToolVersion)'=='15.0'">v141</AutoDetectedPlatformToolset>
     <AutoDetectedPlatformToolset Condition="'$(BuildToolVersion)'=='16.0'">v142</AutoDetectedPlatformToolset>
     <AutoDetectedPlatformToolset Condition="'$(BuildToolVersion)'=='17.0'">v143</AutoDetectedPlatformToolset>
+    <AutoDetectedPlatformToolset Condition="'$(BuildToolVersion)'=='18.0'">v145</AutoDetectedPlatformToolset>
   </PropertyGroup>
   <PropertyGroup Label="EmptyDefaultPlatformToolset">
     <DefaultPlatformToolset Condition=" '$(DefaultPlatformToolset)' == '' ">$(AutoDetectedPlatformToolset)</DefaultPlatformToolset>
@@ -32,11 +34,11 @@
     If not already set, use the latest installed version of the Windows 10 SDK.
     The Windows 10 SDK is backwards compatible to Windows 7, as long as WINVER and _WIN32_WINNT are set before compiling.
     Note:
-      - With VS2019, VS2022 using a value of "10.0" means that it will use the latest installed version.
+      - With VS2019, VS2022, VS2026 using a value of "10.0" means that it will use the latest installed version.
       - With VS2017, we need to manually detect the latest SDK version from the registry.
       - With VS2015, use the Windows 8.1 SDK.
   -->
-  <PropertyGroup Condition="'$(WindowsTargetPlatformVersion)'=='' and ('$(PlatformToolset)'=='v142' or '$(PlatformToolset)'=='v143')">
+  <PropertyGroup Condition="'$(WindowsTargetPlatformVersion)'=='' and ('$(PlatformToolset)'=='v142' or '$(PlatformToolset)'=='v143' or '$(PlatformToolset)'=='v145')">
     <WindowsTargetPlatformVersion>10.0</WindowsTargetPlatformVersion>
   </PropertyGroup>
   <PropertyGroup Condition="'$(WindowsTargetPlatformVersion)'=='' and ('$(PlatformToolset)'=='v141' or '$(AutodetectWin10SDK)'=='true')">
diff --git a/icu/icu4c/source/allinone/Build.Windows.ProjectConfiguration.props b/icu/icu4c/source/allinone/Build.Windows.ProjectConfiguration.props
index a9303482463..ae3e391ce65 100644
--- a/icu/icu4c/source/allinone/Build.Windows.ProjectConfiguration.props
+++ b/icu/icu4c/source/allinone/Build.Windows.ProjectConfiguration.props
@@ -63,11 +63,9 @@
       Note: This version must match the version below in the ARM64 section for AdditionalLibraryDirectories
   -->
   <PropertyGroup Condition="'$(Platform)'=='ARM'">
-    <WindowsTargetPlatformVersion>10.0.22621.0</WindowsTargetPlatformVersion>
     <WindowsSDKDesktopARMSupport>true</WindowsSDKDesktopARMSupport>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Platform)'=='ARM64'">
-    <WindowsTargetPlatformVersion>10.0.22621.0</WindowsTargetPlatformVersion>
     <WindowsSDKDesktopARM64Support>true</WindowsSDKDesktopARM64Support>
   </PropertyGroup>
   <PropertyGroup>
@@ -185,7 +183,6 @@
       <!-- The ARM64 Desktop SDK doesn't include this by default -->
       <AdditionalDependencies>kernel32.lib;%(AdditionalDependencies)</AdditionalDependencies>
       <!-- Note: This needs to match the same version as WindowsTargetPlatformVersion for ARM -->
-      <AdditionalLibraryDirectories>C:\Program Files (x86)\Windows Kits\10\Lib\10.0.22621.0\um\arm</AdditionalLibraryDirectories>
     </Link>
   </ItemDefinitionGroup>
   <!-- Options that are common to all ARM 64-bit configurations for *all* projects. -->
@@ -201,7 +198,6 @@
       <!-- The ARM64 Desktop SDK doesn't include this by default -->
       <AdditionalDependencies>kernel32.lib;%(AdditionalDependencies)</AdditionalDependencies>
       <!-- Note: This needs to match the same version as WindowsTargetPlatformVersion for ARM64 -->
-      <AdditionalLibraryDirectories>C:\Program Files (x86)\Windows Kits\10\Lib\10.0.22621.0\um\arm64</AdditionalLibraryDirectories>
     </Link>
   </ItemDefinitionGroup>
 </Project>
\ No newline at end of file