diff --git a/lib/spack/docs/requirements.txt b/lib/spack/docs/requirements.txt
index 9d8eacba78..6d14c83c32 100644
--- a/lib/spack/docs/requirements.txt
+++ b/lib/spack/docs/requirements.txt
@@ -8,6 +8,6 @@ pygments==2.17.2
 urllib3==2.1.0
 pytest==7.4.3
 isort==5.13.2
-black==23.11.0
+black==23.12.0
 flake8==6.1.0
 mypy==1.7.1