diff --git a/.github/workflows/run-tests.yaml b/.github/workflows/run-tests.yaml
index bfa6b93..4b33f67 100644
--- a/.github/workflows/run-tests.yaml
+++ b/.github/workflows/run-tests.yaml
@@ -9,7 +9,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        os: [ubuntu-20.04, ubuntu-18.04, ubuntu-16.04]
+        os: [ubuntu-20.04, ubuntu-18.04]
         python-version: [3.x, 2.x]
     steps:
       - name: Check out Mininet source