diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index c75196df..55f9491a 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -14,7 +14,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ubuntu-18.04, ubuntu-20.04]
+        os: [ubuntu-20.04]
         python-version: ['3.6', '3.7', '3.8', '3.9', '3.10']
 
     steps: