diff --git a/services/python/payment-gateway-service/requirements.txt b/services/python/payment-gateway-service/requirements.txt
index 9950d6e2..a9b8d6fe 100644
--- a/services/python/payment-gateway-service/requirements.txt
+++ b/services/python/payment-gateway-service/requirements.txt
@@ -38,6 +38,6 @@ pytest-cov==4.1.0
 httpx==0.25.1
 
 # Development
-black==23.11.0
+black==26.5.1
 flake8==6.1.0
 mypy==1.7.1