diff --git a/lib/spack/docs/requirements.txt b/lib/spack/docs/requirements.txt
index f4333b9aaef672..e8c6f9533e2e4c 100644
--- a/lib/spack/docs/requirements.txt
+++ b/lib/spack/docs/requirements.txt
@@ -7,7 +7,7 @@ docutils==0.18.1
 pygments==2.16.1
 urllib3==2.1.0
 pytest==7.4.3
-isort==5.12.0
+isort==5.13.0
 black==23.11.0
 flake8==6.1.0
 mypy==1.7.0