diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 1db9c98..a135c8b 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -24,7 +24,7 @@ jobs:
         working-directory: laconicd/tests/sdk_tests
         run: ./build-laconicd-container.sh
       - name: build test-container
-        run: docker build -t cerc-io/laconic-sdk-tester:local-test -f laconicd/tests/sdk_tests/Dockerfile-sdk .
+        run: docker build -t cerc-io/laconic-sdk-tester:local-test --build-arg VARIANT=19-bullseye -f laconicd/tests/sdk_tests/Dockerfile-sdk .
       - name: start containers
         working-directory: laconicd/tests/sdk_tests
         run: docker compose up -d