diff --git a/pyproject.toml b/pyproject.toml
index dc36a740..b8886561 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -29,7 +29,7 @@ dependencies = [
     "cwl-utils==0.*",
     "myst-parser==3.*",
     "pydata-sphinx-theme==0.*",
-    "sphinx==7.*",
+    "sphinx==8.*",
     "sphinx-reredirects==0.1.*",
     "sphinxcontrib-runcmd==0.2.*",
     "sphinx-favicon",