diff --git a/.readthedocs.yml b/.readthedocs.yml
index 0818c2f44..7cc878efc 100644
--- a/.readthedocs.yml
+++ b/.readthedocs.yml
@@ -8,9 +8,6 @@ build:
   tools:
     python: "3.13"
 
-python:
-  install:
-    - method: pip
-      path: .
-      extra_requirements:
-        - docs
+  jobs:
+    install:
+       - pip install . --group 'docs'
diff --git a/pyproject.toml b/pyproject.toml
index b1351f05c..4e1b5453f 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -2,6 +2,21 @@
 requires = ["setuptools>=61.2"]
 build-backend = "setuptools.build_meta"
 
+[dependency-groups]
+dev = [
+    "pytest<9",
+    'click-type-test==1.1.0;python_version>="3.10"',
+    "coverage<8",
+    "identify>=2.6.9",
+    "pytest-xdist<4",
+    "responses==0.25.7",
+]
+docs = [
+    "sphinx<9",
+    "sphinx-issues<6",
+    "furo==2025.7.19",
+]
+
 [project]
 name = "check-jsonschema"
 version = "0.33.3"
@@ -32,21 +47,6 @@ content-type = "text/markdown"
 [project.urls]
 Homepage = "https://github.com/python-jsonschema/check-jsonschema"
 
-[project.optional-dependencies]
-dev = [
-    "pytest<9",
-    'click-type-test==1.1.0;python_version>="3.10"',
-    "coverage<8",
-    "identify>=2.6.9",
-    "pytest-xdist<4",
-    "responses==0.25.7",
-]
-docs = [
-    "sphinx<9",
-    "sphinx-issues<6",
-    "furo==2025.7.19",
-]
-
 [project.scripts]
 check-jsonschema = "check_jsonschema:main"
 
diff --git a/tox.ini b/tox.ini
index 115d46171..edd6ecfed 100644
--- a/tox.ini
+++ b/tox.ini
@@ -17,7 +17,7 @@ labels =
 [testenv]
 description = "run tests with pytest"
 usedevelop = true
-extras = dev
+dependency_groups = dev
 deps =
 # attrs v23.2.0 is needed for mindeps because jsonschema==4.18.0
 # is uses `hash=True` which was deprecated after this version
@@ -73,7 +73,7 @@ commands = pyright src/ {posargs}
 [testenv:docs]
 description = "build docs with sphinx"
 basepython = python3.10
-extras = docs
+dependency_groups = docs
 allowlist_externals = rm
 changedir = docs/
 # clean the build dir before rebuilding