diff --git a/.github/workflows/CI.yml b/.github/workflows/CI.yml
index ca219d87..357fa77a 100644
--- a/.github/workflows/CI.yml
+++ b/.github/workflows/CI.yml
@@ -20,8 +20,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os:
-          [windows-2022, windows-2019, ubuntu-22.04, ubuntu-20.04, ubuntu-18.04]
+        os: [windows-2022, windows-2019, ubuntu-22.04, ubuntu-20.04]
         method: [local, network]
     runs-on: ${{ matrix.os }}