diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 8fff749..1058887 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -14,7 +14,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [windows-2022,macos-13,ubuntu-22.04]
+        os: [windows-2022,macos-13,ubuntu-20.04]
     runs-on: ${{ matrix.os }}
     steps:
       - name: Check out repository
@@ -35,7 +35,7 @@ jobs:
         if: runner.os == 'Linux'
         uses: matlab-actions/setup-matlab@v2.2.0
         with:
-          release: R2023a
+          release: R2023b
       - name: Set up MEX
         uses: matlab-actions/run-command@v2
         with: