diff --git a/.drone.yml b/.drone.yml
index d5c6dd8..27f434e 100644
--- a/.drone.yml
+++ b/.drone.yml
@@ -8,4 +8,6 @@ steps:
   - apk add --no-cache musl-dev
   - cargo build --verbose --all
   - cargo test --verbose --all
+  environment:
+    CARGO_REGISTRIES_CRATES_IO_PROTOCOL: sparse