diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 667378bd..3462c10f 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -22,7 +22,7 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v4
       - name: Run tests
-        run: cargo test
+        run: cargo test -- --test-threads=1
 
   test_docsrs:
     name: Test (docs.rs)
diff --git a/.github/workflows/codecov.yml b/.github/workflows/codecov.yml
index d0d818b8..95ea15f2 100644
--- a/.github/workflows/codecov.yml
+++ b/.github/workflows/codecov.yml
@@ -24,7 +24,7 @@ jobs:
       - name: Install cargo-llvm-cov
         uses: taiki-e/install-action@cargo-llvm-cov
       - name: Generate code coverage
-        run: cargo llvm-cov --all-features --workspace --lcov --output-path lcov.info
+        run: cargo llvm-cov --all-features --workspace --lcov --output-path lcov.info -- --test-threads=1
       - name: Upload coverage to Codecov
         uses: codecov/codecov-action@v3
         with: