diff --git a/.github/workflows/CI.yml b/.github/workflows/CI.yml
index a154f08..633c61d 100644
--- a/.github/workflows/CI.yml
+++ b/.github/workflows/CI.yml
@@ -16,13 +16,23 @@ jobs:
       matrix:
         version:
           - '1.0'
-          - '1'
+          - '1.6'
+          - '1.7'
           - 'nightly'
         os:
           - ubuntu-latest
         arch:
-          - x86
           - x64
+        include:
+          - version: '1'
+            os: ubuntu-latest
+            arch: x86
+          - version: '1'
+            os: windows-latest
+            arch: x64
+          - version: '1'
+            os: macos-latest
+            arch: x64
     steps:
       - uses: actions/checkout@v2
       - uses: julia-actions/setup-julia@v1