diff --git a/.github/workflows/CI.yaml b/.github/workflows/CI.yaml
index d325b8b..52f4f35 100644
--- a/.github/workflows/CI.yaml
+++ b/.github/workflows/CI.yaml
@@ -20,8 +20,8 @@ jobs:
     strategy:
       matrix:
         julia-version: ['1','1.6']
-        julia-arch: x64
-        os: ubuntu-latest
+        julia-arch: [x64]
+        os: [ubuntu-latest]
 
     steps:
       - uses: actions/checkout@v2