diff --git a/.github/workflows/test.yaml b/.github/workflows/test.yaml
index 5fad595bf..48e8dd4a9 100644
--- a/.github/workflows/test.yaml
+++ b/.github/workflows/test.yaml
@@ -33,8 +33,9 @@ jobs:
           go-version: ${{ matrix.go-version }}
       - name: Install OPA
         run: |
+          OS=$(uname | tr '[:upper:]' '[:lower:]')
           cd /usr/local/bin
-          sudo curl -L -o opa https://openpolicyagent.org/downloads/latest/opa_linux_amd64
+          sudo curl -L -o opa https://openpolicyagent.org/downloads/latest/opa_${OS}_amd64
           sudo chmod +x ./opa
       - name: Checkout code
         uses: actions/checkout@v2