diff --git a/.gitea/workflows/project-ci.yml b/.gitea/workflows/project-ci.yml
index f629f6251..5088f80b6 100644
--- a/.gitea/workflows/project-ci.yml
+++ b/.gitea/workflows/project-ci.yml
@@ -7,6 +7,10 @@ on:
   pull_request:
   workflow_dispatch:
 
+concurrency:
+  group: project-ci-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
+
 permissions:
   contents: read
 
diff --git a/vitest.config.ts b/vitest.config.ts
index 0af75894a..d577cdbe5 100644
--- a/vitest.config.ts
+++ b/vitest.config.ts
@@ -68,7 +68,7 @@ export default defineConfig({
     environment: 'node',
     globals: true,
     minThreads: 1,
-    maxThreads: 8,
+    maxThreads: 1,
     server: {
       deps: {
         inline: [