diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index fc1e854..692c024 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -116,7 +116,7 @@ jobs:
             comp: llvm
             procs: $(sysctl -n hw.ncpu)
             ccache_cache: /Users/runner/Library/Caches/ccache
-          - os: ubuntu-latest
+          - os: ubuntu-22.04
             install_deps: sudo apt-get update && sudo apt-get install mpich libmpich-dev
             comp: gnu
             procs: $(nproc)
@@ -201,14 +201,14 @@ jobs:
   GPU-Nvidia:
     name: GPU-CUDA
     needs: [Formatting, CPU-GNUmake]
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     strategy:
       matrix:
-        cuda_ver: [11.4]
+        cuda_ver: [12.6]
         include:
-          - cuda_ver: "11.4"
-            cuda_pkg: 11-4
-            cuda_extra: libcurand-dev-11-4 cuda-cupti-dev-11-4
+          - cuda_ver: "12.6"
+            cuda_pkg: 12-6
+            cuda_extra: libcurand-dev-12-6 cuda-cupti-dev-12-6
     steps:
       - name: Clone
         uses: actions/checkout@v4