diff --git a/lib/spack/docs/requirements.txt b/lib/spack/docs/requirements.txt
index 10e19f093e5eec..a6597b0a98272b 100644
--- a/lib/spack/docs/requirements.txt
+++ b/lib/spack/docs/requirements.txt
@@ -3,7 +3,7 @@ sphinxcontrib-programoutput==0.17
 sphinx_design==0.5.0
 sphinx-rtd-theme==1.3.0
 python-levenshtein==0.23.0
-docutils==0.18.1
+docutils==0.21.2
 pygments==2.16.1
 urllib3==2.0.7
 pytest==7.4.3