diff --git a/test_project/requirements.txt b/test_project/requirements.txt
index 359fe31..fb0f682 100644
--- a/test_project/requirements.txt
+++ b/test_project/requirements.txt
@@ -2,7 +2,7 @@ requests==2.32.0
 flask>=2.0.0,<3.0.0
 django[async]>=3.2
 pytest-cov>=4.0.0
-black==23.12.1
+black==26.3.1
 # Comment: development tools
 ruff>=0.1.0
 mypy>=1.0.0