diff --git a/lib/spack/docs/requirements.txt b/lib/spack/docs/requirements.txt
index 7785508b15b58e..a548287a87bc95 100644
--- a/lib/spack/docs/requirements.txt
+++ b/lib/spack/docs/requirements.txt
@@ -1,4 +1,4 @@
-sphinx==7.4.6
+sphinx==8.0.0
 sphinxcontrib-programoutput==0.17
 sphinx_design==0.6.0
 sphinx-rtd-theme==2.0.0