diff --git a/lib/spack/docs/requirements.txt b/lib/spack/docs/requirements.txt
index 65fcfcdd46..3b67cbe306 100644
--- a/lib/spack/docs/requirements.txt
+++ b/lib/spack/docs/requirements.txt
@@ -1,7 +1,7 @@
 sphinx==7.2.6
 sphinxcontrib-programoutput==0.17
 sphinx_design==0.5.0
-sphinx-rtd-theme==1.3.0
+sphinx-rtd-theme==2.0.0
 python-levenshtein==0.23.0
 docutils==0.18.1
 pygments==2.17.1