diff --git a/.github/workflows/CI.yml b/.github/workflows/CI.yml
index d8f5026..e76b3e0 100644
--- a/.github/workflows/CI.yml
+++ b/.github/workflows/CI.yml
@@ -3,7 +3,7 @@ on:
   push:
     branches:
       - master
-    tags: "*"
+    tags: ["*"]
   pull_request:
 concurrency:
   # Skip intermediate builds: always.
@@ -19,18 +19,12 @@ jobs:
       matrix:
         version:
           - "1.6"
-          - "1.7"
+          - "1"
           - "nightly"
         os:
           - ubuntu-latest
-          - macOS-latest
-          - windows-latest
         arch:
           - x64
-          - x86
-        exclude:
-          - os: macOS-latest
-            arch: x86
     steps:
       - uses: actions/checkout@v2
       - uses: julia-actions/setup-julia@v1