diff --git a/.github/workflows/run_test.yml b/.github/workflows/run_test.yml
index 39aa9c8..844858e 100644
--- a/.github/workflows/run_test.yml
+++ b/.github/workflows/run_test.yml
@@ -7,7 +7,7 @@ jobs:
     name: Octave tests
     strategy:
       matrix:
-        os: [ubuntu-18.04, ubuntu-20.04, ubuntu-22.04, macos-11, windows-2019]
+        os: [ubuntu-20.04, ubuntu-22.04, macos-11, windows-2019]
     runs-on: ${{ matrix.os }}
     defaults:
       run: