diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 5dea8e2db..87f073067 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -219,6 +219,8 @@ test:
         fi
         echo "Waiting for Redis... ($i/30)"; sleep 1
       done
+    # Purge sccache — stale PTX from L4 (sm_89) causes CUDA_ERROR_INVALID_PTX on H100 (sm_90)
+    - rm -rf "${SCCACHE_DIR:?}"/* || true
     - sccache --zero-stats || true
     - cargo test --workspace --lib -- --skip model_loader::tests
     - sccache --show-stats || true