diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 8478196..b4f3d9a 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -15,6 +15,7 @@ env:
   RUST_LOG: info
   RUST_BACKTRACE: 1
   CARGO_TERM_COLOR: always
+  CARGO_REGISTRIES_CRATES_IO_PROTOCOL: sparse
 
 jobs:
   test: