diff --git a/requirements/requirements-macos-latest-3.11.txt b/requirements/requirements-macos-latest-3.11.txt
index 653d833f..92e49e8e 100644
--- a/requirements/requirements-macos-latest-3.11.txt
+++ b/requirements/requirements-macos-latest-3.11.txt
@@ -18,7 +18,7 @@ backrefs==6.1
     # via mkdocs-material
 beautifulsoup4==4.14.3
     # via nbconvert
-black==25.12.0
+black==26.3.1
     # via pyhdx (pyproject.toml)
 bleach==6.3.0
     # via
diff --git a/requirements/requirements-macos-latest-3.12.txt b/requirements/requirements-macos-latest-3.12.txt
index d652ba9a..9dcf2852 100644
--- a/requirements/requirements-macos-latest-3.12.txt
+++ b/requirements/requirements-macos-latest-3.12.txt
@@ -18,7 +18,7 @@ backrefs==6.1
     # via mkdocs-material
 beautifulsoup4==4.14.3
     # via nbconvert
-black==25.12.0
+black==26.3.1
     # via pyhdx (pyproject.toml)
 bleach==6.3.0
     # via
diff --git a/requirements/requirements-ubuntu-latest-3.11.txt b/requirements/requirements-ubuntu-latest-3.11.txt
index a5178c76..3317898f 100644
--- a/requirements/requirements-ubuntu-latest-3.11.txt
+++ b/requirements/requirements-ubuntu-latest-3.11.txt
@@ -16,7 +16,7 @@ backrefs==6.1
     # via mkdocs-material
 beautifulsoup4==4.14.3
     # via nbconvert
-black==25.12.0
+black==26.3.1
     # via pyhdx (pyproject.toml)
 bleach==6.3.0
     # via
diff --git a/requirements/requirements-ubuntu-latest-3.12.txt b/requirements/requirements-ubuntu-latest-3.12.txt
index d22f08b8..fe9ad127 100644
--- a/requirements/requirements-ubuntu-latest-3.12.txt
+++ b/requirements/requirements-ubuntu-latest-3.12.txt
@@ -16,7 +16,7 @@ backrefs==6.1
     # via mkdocs-material
 beautifulsoup4==4.14.3
     # via nbconvert
-black==25.12.0
+black==26.3.1
     # via pyhdx (pyproject.toml)
 bleach==6.3.0
     # via
diff --git a/requirements/requirements-windows-latest-3.11.txt b/requirements/requirements-windows-latest-3.11.txt
index cf4a3fe9..84f1ca9b 100644
--- a/requirements/requirements-windows-latest-3.11.txt
+++ b/requirements/requirements-windows-latest-3.11.txt
@@ -16,7 +16,7 @@ backrefs==6.1
     # via mkdocs-material
 beautifulsoup4==4.14.3
     # via nbconvert
-black==25.12.0
+black==26.3.1
     # via pyhdx (pyproject.toml)
 bleach==6.3.0
     # via
diff --git a/requirements/requirements-windows-latest-3.12.txt b/requirements/requirements-windows-latest-3.12.txt
index 924baea4..c696eead 100644
--- a/requirements/requirements-windows-latest-3.12.txt
+++ b/requirements/requirements-windows-latest-3.12.txt
@@ -16,7 +16,7 @@ backrefs==6.1
     # via mkdocs-material
 beautifulsoup4==4.14.3
     # via nbconvert
-black==25.12.0
+black==26.3.1
     # via pyhdx (pyproject.toml)
 bleach==6.3.0
     # via