diff --git a/docs/requirements.txt b/docs/requirements.txt
index d5c88e84668..8fbf842a468 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -1,7 +1,7 @@
 # Used by ReadTheDocs; pinned requirements for stability.
 
 myst-parser==3.0.1
-Sphinx==7.4.7
+Sphinx==8.1.3
 # Older versions break Sphinx even though they're declared to be supported.
 docutils==0.20.1
 sphinxcontrib-programoutput==0.17