diff --git a/requirements-dev.txt b/requirements-dev.txt
index 47a8e78..9233b69 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -6,7 +6,7 @@ pytest==5.4.2
 pytest-runner==5.2
 pytest-vcr==1.0.2
 pytest-cov==2.8.1
-sphinx==3.0.4
+sphinx==8.1.3
 sphinx-autobuild==0.7.1
 sphinx_gallery==0.7.0
 sphinx_rtd_theme==0.4.3