diff --git a/requirements.txt b/requirements.txt
index b665514..86efecc 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -54,7 +54,7 @@ snowballstemmer==2.2.0
     # via sphinx
 soupsieve==2.5
     # via beautifulsoup4
-sphinx==8.0.2
+sphinx==8.1.3
     # via
     #   -r requirements.in
     #   furo
@@ -62,8 +62,6 @@ sphinx==8.0.2
     #   sphinx-basic-ng
     #   sphinx-design
     #   sphinxcontrib-applehelp
-    #   sphinxcontrib-devhelp
-    #   sphinxcontrib-htmlhelp
     #   sphinxcontrib-qthelp
     #   sphinxcontrib-serializinghtml
 sphinx-basic-ng==1.0.0b2
@@ -72,9 +70,9 @@ sphinx-design==0.6.1
     # via -r requirements.in
 sphinxcontrib-applehelp==1.0.7
     # via sphinx
-sphinxcontrib-devhelp==1.0.5
+sphinxcontrib-devhelp==2.0.0
     # via sphinx
-sphinxcontrib-htmlhelp==2.0.4
+sphinxcontrib-htmlhelp==2.1.0
     # via sphinx
 sphinxcontrib-jsmath==1.0.1
     # via sphinx