diff --git a/constraints.txt b/constraints.txt
index 3183b8b1..f92a27bb 100644
--- a/constraints.txt
+++ b/constraints.txt
@@ -48,7 +48,7 @@ setuptools==80.9.0
 setuptools-scm==9.2.2
 snowballstemmer==3.0.1
 sortedcontainers==2.4.0
-Sphinx==8.0.2
+Sphinx==8.1.3
 sphinx-rtd-theme==3.0.2
 sphinxcontrib-applehelp==2.0.0
 sphinxcontrib-devhelp==2.0.0