diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 0303f540..c9bc87b5 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -29,7 +29,10 @@ jobs:
 
   test:
     name: Test Suite
-    runs-on: ubuntu-latest
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [macos-latest, ubuntu-latest, windows-latest]
     steps:
       - name: Checkout sources
         uses: actions/checkout@v2
@@ -124,7 +127,7 @@ jobs:
         uses: actions/checkout@v2
 
       - name: Get latest toolchain version with miri
-        run: echo "::set-env name=TOOLCHAIN::$(curl -s https://rust-lang.github.io/rustup-components-history/x86_64-unknown-linux-gnu/miri)"
+        run: echo "TOOLCHAIN=$(curl -s https://rust-lang.github.io/rustup-components-history/x86_64-unknown-linux-gnu/miri)" >> $GITHUB_ENV
 
       - name: Install latest nightly toolchain with miri
         uses: actions-rs/toolchain@v1