diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index dc3a647..3af84c9 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -51,6 +51,7 @@ jobs:
         uses: actions-rs/cargo@v1
         with:
           command: clippy
+          args: -- -D warnings
 
       - name: Cargo test
         uses: actions-rs/cargo@v1