diff --git a/.github/workflows/zfs-tests-functional.yml b/.github/workflows/zfs-tests-functional.yml
index 26a8bf052..c2a8dec99 100644
--- a/.github/workflows/zfs-tests-functional.yml
+++ b/.github/workflows/zfs-tests-functional.yml
@@ -9,7 +9,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [18.04, 20.04]
+        os: [20.04]
     runs-on: ubuntu-${{ matrix.os }}
     steps:
     - uses: actions/checkout@v3