diff --git a/.github/workflows/ccpp.yml b/.github/workflows/ccpp.yml
index ad1c8a5..a1645e4 100644
--- a/.github/workflows/ccpp.yml
+++ b/.github/workflows/ccpp.yml
@@ -11,7 +11,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        os: [ubuntu-18.04, ubuntu-20.04, ubuntu-22.04]
+        os: [ubuntu-20.04, ubuntu-22.04]
     steps:
     - uses: actions/checkout@v2
     - name: install-deps