diff --git a/src/projects/defi/firn-protocol/index.yaml b/src/projects/defi/firn-protocol/index.yaml
index e4293dcd..77875af5 100644
--- a/src/projects/defi/firn-protocol/index.yaml
+++ b/src/projects/defi/firn-protocol/index.yaml
@@ -8,7 +8,7 @@ token:
   network: Optimism
   contract_address: "0xb20d84ebFeCdC6821448C7094564a039F0AE5EA4"
 project_type: DeFi
-product_launch_day: 2021/11/06
+product_launch_day: "2021-11-06"
 technology:
   type: ZK
   name: Zero-knowledge