diff --git a/lib/spack/docs/requirements.txt b/lib/spack/docs/requirements.txt
index 09fee9728f9..d060771aac9 100644
--- a/lib/spack/docs/requirements.txt
+++ b/lib/spack/docs/requirements.txt
@@ -8,6 +8,6 @@ pygments==2.18.0
 urllib3==2.2.2
 pytest==8.3.1
 isort==5.13.2
-black==24.4.2
+black==24.8.0
 flake8==7.1.0
 mypy==1.11.1