diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 9274a0f..dee3fd8 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -25,7 +25,7 @@ jobs:
       - name: Build with logging and webpki roots
         run: cargo build --features logging,webpki-roots --no-default-features
       - name: Run tests
-        run: cargo test
+        run: cargo test -- --test-threads 1
 
   clippy:
     name: run clippy lints