diff --git a/pyproject.toml b/pyproject.toml
index cbd16ef8..236a47fb 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -65,9 +65,9 @@ dev = [
     "lxml>=4.9.3",
     "markdown>=3.5.1",
     "typogrify>=2.1.0",
-    "sphinx>=7.1.2",
+    "sphinx>=9.0.0",
     "sphinxext-opengraph>=0.9.0",
-    "furo==2025.9.25",
+    "furo==2025.12.19",
     "livereload>=2.6.3",
     "psutil>=5.9.6",
     "pygments>=2.16.1,<2.20.0",
diff --git a/requirements/docs.pip b/requirements/docs.pip
index 4684ff8e..2f895ae4 100644
--- a/requirements/docs.pip
+++ b/requirements/docs.pip
@@ -1,5 +1,5 @@
 sphinx
 sphinxext-opengraph
-furo==2023.9.10
+furo==2025.12.19
 livereload
 matplotlib