diff --git a/src/projects/arpa/index.yaml b/src/projects/arpa/index.yaml
index afee221c..e3aed1c4 100644
--- a/src/projects/arpa/index.yaml
+++ b/src/projects/arpa/index.yaml
@@ -1,6 +1,5 @@
 name: ARPA
-categories:
-  - computing-network
+categories: [ computing-network ]
 description: 'Threshold BLS network can serve as the infrastructure of verifiable random number generator (RNG), secure wallet, cross-chain bridge, decentralized custody etc'
 ecosystem: multichain
 project_status: