diff --git a/.github/workflows/ci-ubuntu.yml b/.github/workflows/ci-ubuntu.yml
index 58f22a1..3da5ff3 100644
--- a/.github/workflows/ci-ubuntu.yml
+++ b/.github/workflows/ci-ubuntu.yml
@@ -12,7 +12,7 @@ on:
 name: ci-ubuntu
 
 env:
-  DOTNET_VERSION: 8.0.x
+  DOTNET_VERSION: 9.0.x
   REGISTRY: ghcr.io
 
 jobs:
diff --git a/.github/workflows/ci-windows.yml b/.github/workflows/ci-windows.yml
index 0b5d412..740b460 100644
--- a/.github/workflows/ci-windows.yml
+++ b/.github/workflows/ci-windows.yml
@@ -12,7 +12,7 @@ on:
 name: ci-windows
 
 env:
-  DOTNET_VERSION: 8.0.x
+  DOTNET_VERSION: 9.0.x
   REGISTRY: ghcr.io
 
 jobs: