diff --git a/lib/spack/docs/requirements.txt b/lib/spack/docs/requirements.txt
index cb766413d95..f1d6e8f5a72 100644
--- a/lib/spack/docs/requirements.txt
+++ b/lib/spack/docs/requirements.txt
@@ -1,7 +1,7 @@
 sphinx==7.4.7
 sphinxcontrib-programoutput==0.17
 sphinx_design==0.6.1
-sphinx-rtd-theme==2.0.0
+sphinx-rtd-theme==3.0.1
 python-levenshtein==0.25.1
 docutils==0.20.1
 pygments==2.18.0