diff --git a/.github/workflows/build-linux.yml b/.github/workflows/build-linux.yml
index 384b6708..30fb3314 100644
--- a/.github/workflows/build-linux.yml
+++ b/.github/workflows/build-linux.yml
@@ -6,7 +6,7 @@ jobs:
     build-matrix:
       strategy:
         matrix:
-          os: [ ubuntu-18.04, ubuntu-20.04 ]
+          os: [ ubuntu-20.04 ]
           option: [ minimal, default, maximal ]
       runs-on: ${{ matrix.os }}
       steps: