diff --git a/.github/workflows/run-tests.yml b/.github/workflows/run-tests.yml
index 3009e37b..788241fd 100644
--- a/.github/workflows/run-tests.yml
+++ b/.github/workflows/run-tests.yml
@@ -17,7 +17,7 @@ jobs:
           - { os: ubuntu-latest, python_version: '2.7' }
           - { os: ubuntu-20.04, python_version: '3.5' }
           - { os: ubuntu-20.04, python_version: '3.6' }
-          - { os: ubuntu-18.04, python_version: '3.7' }
+          - { os: ubuntu-20.04, python_version: '3.7' }
           - { os: ubuntu-22.04, python_version: '3.8' }
           - { os: ubuntu-24.04, python_version: '3.9' }
           - { os: ubuntu-latest, python_version: '3.10' }