diff --git a/lib/spack/docs/requirements.txt b/lib/spack/docs/requirements.txt
index 9e09e31e995..a115051ce56 100644
--- a/lib/spack/docs/requirements.txt
+++ b/lib/spack/docs/requirements.txt
@@ -6,3 +6,8 @@ python-levenshtein==0.21.1
 docutils==0.18.1
 pygments==2.15.1
 urllib3==2.0.3
+pytest==7.4.0
+isort==5.12.0
+black==23.1.0
+flake8==6.0.0
+mypy==1.4.1