diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 84a30f5..ca8aa22 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -40,6 +40,7 @@ jobs:
         container:
           - debian:bullseye-slim
           - debian:bookworm-slim
+          - debian:testing-slim
           - debian:unstable-slim
           - ubuntu:jammy
           - ubuntu:mantic