diff --git a/lib/spack/docs/requirements.txt b/lib/spack/docs/requirements.txt
index 355f612d1f0..e954238c956 100644
--- a/lib/spack/docs/requirements.txt
+++ b/lib/spack/docs/requirements.txt
@@ -1,7 +1,7 @@
 sphinx==6.2.1
 sphinxcontrib-programoutput==0.17
 sphinx_design==0.5.0
-sphinx-rtd-theme==1.2.2
+sphinx-rtd-theme==1.3.0
 python-levenshtein==0.21.1
 docutils==0.18.1
 pygments==2.16.1