diff --git a/.github/workflows/CI.yml b/.github/workflows/CI.yml
index 7056baf..b3bc53f 100644
--- a/.github/workflows/CI.yml
+++ b/.github/workflows/CI.yml
@@ -17,11 +17,16 @@ jobs:
     strategy:
       matrix:
         version:
+          - '1.6'
           - '1.9'
+          - 'nightly'
         os:
+          - macOS-latest
+          - windows-latest
           - ubuntu-latest
         arch:
           - x64
+          - x86
     steps:
       - uses: actions/checkout@v2
       - uses: julia-actions/setup-julia@v1