diff --git a/pyproject.toml b/pyproject.toml
index d670381..8c89274 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -42,7 +42,7 @@ dependencies = [
 dev = [
     "pytest>=7.0",
     "pytest-cov>=4.0",
-    "black==25.11.0",
+    "black==26.10.0",
     "ruff>=0.1.0",
     "mypy>=1.0",
 ]
diff --git a/test_project/requirements.txt b/test_project/requirements.txt
index 359fe31..853aaef 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==26.10.0
 # Comment: development tools
 ruff>=0.1.0
 mypy>=1.0.0