diff --git a/.github/workflows/build-test.yml b/.github/workflows/build-test.yml
index f00004c3..72a2550a 100644
--- a/.github/workflows/build-test.yml
+++ b/.github/workflows/build-test.yml
@@ -31,7 +31,7 @@ jobs:
       fail-fast: false
       max-parallel: 1
       matrix:
-        os: ['ubuntu-18.04', 'ubuntu-20.04']
+        os: ['ubuntu-20.04']
 
     steps:
       - uses: actions/checkout@v2