diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index d2ed784c..323399ce 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -5,6 +5,9 @@ on:
   pull_request:
   schedule: [cron: "40 1 * * *"]
 
+env:
+  RUSTFLAGS: -Dwarnings
+
 jobs:
   test:
     name: Test suite