diff --git a/lib/spack/docs/requirements.txt b/lib/spack/docs/requirements.txt
index e6a8fdfe064d33..3b841d4a6a7243 100644
--- a/lib/spack/docs/requirements.txt
+++ b/lib/spack/docs/requirements.txt
@@ -1,4 +1,4 @@
-sphinx==7.4.7
+sphinx==8.1.3
 sphinxcontrib-programoutput==0.17
 sphinx_design==0.6.1
 sphinx-rtd-theme==3.0.1