diff --git a/lib/spack/docs/requirements.txt b/lib/spack/docs/requirements.txt
index 879fe33874579b..d7de557cee4c7a 100644
--- a/lib/spack/docs/requirements.txt
+++ b/lib/spack/docs/requirements.txt
@@ -7,7 +7,7 @@ docutils==0.21.2
 pygments==2.18.0
 urllib3==2.2.3
 pytest==8.3.3
-isort==5.13.2
+isort==6.0.1
 black==24.10.0
 flake8==7.1.1
 mypy==1.11.1