diff --git a/.gitea/workflows/test.yml b/.gitea/workflows/test.yml
index 89582472..f0b5b056 100644
--- a/.gitea/workflows/test.yml
+++ b/.gitea/workflows/test.yml
@@ -84,7 +84,7 @@ jobs:
           fi
           git checkout FETCH_HEAD
       - run: apt-get update -qq && apt-get install -y -qq libwebkit2gtk-4.1-dev libssl-dev libgtk-3-dev libayatana-appindicator3-dev librsvg2-dev patchelf pkg-config perl
-      - run: cargo test --manifest-path src-tauri/Cargo.toml
+      - run: cargo test --manifest-path src-tauri/Cargo.toml -- --test-threads=1
 
   frontend-typecheck:
     runs-on: ubuntu-latest
diff --git a/AGENTS.md b/AGENTS.md
index cdeb7ae4..e1954b5e 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -9,9 +9,9 @@
 | Frontend production build | `npm run build` |
 | Rust fmt check | `cargo fmt --manifest-path src-tauri/Cargo.toml --check` |
 | Rust clippy | `cargo clippy --manifest-path src-tauri/Cargo.toml -- -D warnings` |
-| Rust tests | `cargo test --manifest-path src-tauri/Cargo.toml` |
-| Rust single test module | `cargo test --manifest-path src-tauri/Cargo.toml pii::detector` |
-| Rust single test | `cargo test --manifest-path src-tauri/Cargo.toml test_detect_ipv4` |
+| Rust tests | `cargo test --manifest-path src-tauri/Cargo.toml -- --test-threads=1` |
+| Rust single test module | `cargo test --manifest-path src-tauri/Cargo.toml -- --test-threads=1 pii::detector` |
+| Rust single test | `cargo test --manifest-path src-tauri/Cargo.toml -- --test-threads=1 test_detect_ipv4` |
 | Frontend test (single run) | `npm run test:run` |
 | Frontend test (watch) | `npm run test` |
 | Frontend coverage | `npm run test:coverage` |