diff --git a/RedHit/pyproject.toml b/RedHit/pyproject.toml
index 61ef33e2..31705244 100644
--- a/RedHit/pyproject.toml
+++ b/RedHit/pyproject.toml
@@ -101,7 +101,7 @@ tests = [
   "pytest_httpserver>=1.1.0"
 ]
 lint = [
-  "black==24.4.2",
+  "black==26.3.1",
   "pylint>=3.1.0",
 ]
 calibration = [
diff --git a/RedHit/requirements.txt b/RedHit/requirements.txt
index e91cf024..dc703182 100644
--- a/RedHit/requirements.txt
+++ b/RedHit/requirements.txt
@@ -44,7 +44,7 @@ respx>=0.21.1
 pytest-cov>=5.0.0
 pytest_httpserver>=1.1.0
 # lint
-black==24.4.2
+black==26.3.1
 pylint>=3.1.0
 # calibration
 scipy>=1.14.0