diff --git a/.devcontainer/Dockerfile b/.devcontainer/Dockerfile
index b3336ca3..53b7d367 100644
--- a/.devcontainer/Dockerfile
+++ b/.devcontainer/Dockerfile
@@ -1,5 +1,5 @@
 # Refer to https://hub.docker.com/_/microsoft-dotnet-sdk for available versions
-FROM mcr.microsoft.com/dotnet/sdk:8.0.400-jammy
+FROM mcr.microsoft.com/dotnet/sdk:8.0.400-noble
 
 # Installing mono makes `dotnet test` work without errors even for net472.
 # But installing it takes a long time, so it's excluded by default.
diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index cdf4ac96..9bcbeee9 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -21,7 +21,7 @@ jobs:
       fail-fast: false
       matrix:
         os:
-        - ubuntu-20.04
+        - ubuntu-24.04
         - macos-latest
         - windows-latest
 
diff --git a/azure-pipelines/build.yml b/azure-pipelines/build.yml
index 3d53ed83..295fc9ba 100644
--- a/azure-pipelines/build.yml
+++ b/azure-pipelines/build.yml
@@ -28,7 +28,7 @@ jobs:
 
 - job: Linux
   pool:
-    vmImage: Ubuntu 20.04
+    vmImage: Ubuntu 24.04
   steps:
   - checkout: self
     fetchDepth: 0 # avoid shallow clone so nbgv can do its work.