diff --git a/docs/requirements.txt b/docs/requirements.txt
index 9560b4d..be4f691 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -1,4 +1,4 @@
-sphinx==7.4.7
+sphinx==9.0.4
 sphinx-rtd-theme==3.0.2
 myst-parser==4.0.1
 sphinx-copybutton==0.5.2
diff --git a/pyproject.toml b/pyproject.toml
index 035a080..8a0ad5b 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -172,7 +172,7 @@ all = ["memdiver[marimo]", "memdiver[vol]"]
 full = ["memdiver[all]"]
 dev = ["pytest>=8.0", "pytest-asyncio>=0.23", "pytest-cov>=5.0", "httpx>=0.27", "ruff>=0.6", "mypy>=1.10", "hypothesis"]
 docs = [
-    "sphinx>=7.3,<9",
+    "sphinx>=7.3,<10",
     "sphinx-rtd-theme>=2.0,<4",
     "myst-parser>=3.0,<5",
     "sphinx-copybutton>=0.5.2",