diff --git a/.github/workflows/Tier1.yml b/.github/workflows/Tier1.yml
index 57d4189..b074cc3 100644
--- a/.github/workflows/Tier1.yml
+++ b/.github/workflows/Tier1.yml
@@ -24,7 +24,7 @@ jobs:
       matrix:
         julia-version: [1]
         julia-arch: [x64]
-        os: [ubuntu-18.04, macos-10.15, windows-2019]
+        os: [ubuntu-latest, macos-latest, windows-latest]
     steps:
       - uses: actions/checkout@v2
       - uses: julia-actions/setup-julia@v1
diff --git a/.github/workflows/Tier2.yml b/.github/workflows/Tier2.yml
index c88b37f..682993e 100644
--- a/.github/workflows/Tier2.yml
+++ b/.github/workflows/Tier2.yml
@@ -25,12 +25,7 @@ jobs:
       matrix:
         julia-version: [1.6, nightly]
         julia-arch: [x64]
-        os: [ubuntu-18.04]
-        exclude:
-          - julia-version: 1.3
-            julia-arch: x64
-          - os: macos-10.15
-            julia-arch: x86
+        os: [ubuntu-latest]
     steps:
       - uses: actions/checkout@v2
       - uses: julia-actions/setup-julia@v1