diff --git a/.ado/pipelines/azure-pipelines-build.yml b/.ado/pipelines/azure-pipelines-build.yml
index 441cb785b..e592ad3b7 100644
--- a/.ado/pipelines/azure-pipelines-build.yml
+++ b/.ado/pipelines/azure-pipelines-build.yml
@@ -379,7 +379,9 @@ stages:
           targetTriple: aarch64-unknown-linux-gnu
           artifactName: stage-desktop-linux-arm64
     pool:
-      vmImage: ubuntu-latest
+      # Ubuntu 24.04 is required to match Chromium's build baseline.
+      # Match desktop-npm-native in .github/workflows/pr.yml.
+      vmImage: ubuntu-24.04
     steps:
     - checkout: self
       clean: true
diff --git a/.github/workflows/pr.yml b/.github/workflows/pr.yml
index 37064c99f..c72bbb653 100644
--- a/.github/workflows/pr.yml
+++ b/.github/workflows/pr.yml
@@ -277,8 +277,9 @@ jobs:
       fail-fast: false
       matrix:
         platform:
-          - { target: x86_64-unknown-linux-gnu, os: ubuntu-latest, package: webui-desktop-linux-x64, consumer: true }
-          - { target: aarch64-unknown-linux-gnu, os: ubuntu-latest, package: webui-desktop-linux-arm64, consumer: false }
+          # Ubuntu 24.04 is required to match Chromium and the release build baseline.
+          - { target: x86_64-unknown-linux-gnu, os: ubuntu-24.04, package: webui-desktop-linux-x64, consumer: true }
+          - { target: aarch64-unknown-linux-gnu, os: ubuntu-24.04, package: webui-desktop-linux-arm64, consumer: false }
           - { target: x86_64-apple-darwin, os: macos-latest-large, package: webui-desktop-darwin-x64, consumer: true }
           - { target: aarch64-apple-darwin, os: macos-latest-large, package: webui-desktop-darwin-arm64, consumer: false }
           - { target: x86_64-pc-windows-msvc, os: windows-latest, package: webui-desktop-win32-x64, consumer: true }