diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index ce7fcd0..8d97306 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -6,9 +6,17 @@ on:
   push:
     branches: [main]
 
+permissions:
+  contents: read
+
+concurrency:
+  group: ci-${{ github.ref }}
+  cancel-in-progress: true
+
 jobs:
   build-and-test:
     runs-on: ubuntu-latest
+    timeout-minutes: 15
     steps:
       - uses: actions/checkout@v4
 
diff --git a/.gitignore b/.gitignore
index c49dda9..8b089dc 100644
--- a/.gitignore
+++ b/.gitignore
@@ -40,4 +40,4 @@ mnemonic.txt
 vector-audit-log.json
 
 # Incremental typecheck cache (npm run typecheck uses --incremental)
-*.tsbuildinfo
\ No newline at end of file
+*.tsbuildinfo