diff --git a/.readthedocs.yaml b/.readthedocs.yaml
index 73ac2291..22c2ec10 100644
--- a/.readthedocs.yaml
+++ b/.readthedocs.yaml
@@ -1,9 +1,9 @@
 version: 2
 
 build:
-  os: ubuntu-20.04
+  os: ubuntu-22.04
   tools:
-    python: "3.9"
+    python: "3.11"
 
 # Build documentation in the docs/ directory with Sphinx
 sphinx:
diff --git a/pyproject.toml b/pyproject.toml
index 1b41c886..93aa541e 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -41,10 +41,10 @@ NiPreps = "https://www.nipreps.org/"
 
 [project.optional-dependencies]
 doc = [
-    "furo ~= 2021.10.09",
+    "furo",
     "pydot >= 1.2.3",
     "pydotplus",
-    "sphinx ~= 4.0",
+    "sphinx",
     "sphinxcontrib-apidoc",
     "sphinxcontrib-napoleon",
 ]