diff --git a/.github/workflows/python-package.yaml b/.github/workflows/python-package.yaml
index 09af913..2259fff 100644
--- a/.github/workflows/python-package.yaml
+++ b/.github/workflows/python-package.yaml
@@ -6,7 +6,6 @@ on:
 
 jobs:
   test:
-    name: Test Python ${{ matrix.python-version }} on ${{ matrix.os }}
     runs-on: ${{ matrix.os }}
 
     strategy:
@@ -21,12 +20,11 @@ jobs:
           - "3.10"
           - "3.11"
           - "3.12"
+          - "3.13"
 
     steps:
     - uses: actions/checkout@v4
-
-    - name: Set up Python ${{ matrix.python-version }}
-      uses: actions/setup-python@v5
+    - uses: actions/setup-python@v5
       with:
         python-version: ${{ matrix.python-version }}
 
@@ -34,8 +32,7 @@ jobs:
         # ensure we're using *our* dotenv during testing and not some other one
         # installed on the system, e.g. gh machines apparently have sometimes
         # the ruby dotenv package installed
-        pip install --upgrade -r requirements-dev.txt
-        pip install -e .['dev']
+        pip install --upgrade -e .['dev']
         make test
 
   lint:
diff --git a/.readthedocs.yaml b/.readthedocs.yaml
index ac9063d..43da301 100644
--- a/.readthedocs.yaml
+++ b/.readthedocs.yaml
@@ -8,6 +8,9 @@ build:
 mkdocs:
   configuration: mkdocs.yml
 
+
 python:
   install:
-  - requirements: requirements-dev.txt
+    - path: .
+      extra_requirements:
+        - dev
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9eab1ff..afcdaa1 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,7 +2,13 @@
 
 ## [unreleased]
 
-* removed ruff's target-version, defaulting to pyproject's requires-python
+* Added Python 3.13 to github ci
+* Updated pyproject.toml to comply with latest setuptools recommendation:
+  * Removed License Classifier
+  * Use license-files to point to LICENSE file
+* Removed requirements-dev.txt, relying on pyproject.toml to specify the
+  requirements
+* Removed ruff's target-version, defaulting to pyproject's requires-python
 
 ## [3.4.1] -- 2024-08-28
 
diff --git a/Makefile b/Makefile
index f9ac3f5..0ce44bf 100644
--- a/Makefile
+++ b/Makefile
@@ -15,10 +15,9 @@ endif
 .PHONY: all
 all: lint mypy test test-docs test-release
 
-$(VENV): requirements-dev.txt pyproject.toml
+$(VENV): pyproject.toml
 	$(PY) -m venv $(VENV)
-	$(BIN)/pip install --upgrade -r requirements-dev.txt
-	$(BIN)/pip install -e .['dev']
+	$(BIN)/pip install --upgrade -e .['dev']
 	touch $(VENV)
 
 # in this target, our tests are using Popen etc to run other scrips. Therefore
diff --git a/pyproject.toml b/pyproject.toml
index 3af9a86..d8e5a1b 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -10,13 +10,12 @@ authors = [
 description = "Simple dotenv CLI."
 keywords = ["dotenv", "cli", ".env"]
 readme = "README.md"
-license = { file = "LICENSE" }
+license-files = ["LICENSE"]
 requires-python = ">=3.9"
 dynamic = ["version"]
 classifiers = [
     "Development Status :: 5 - Production/Stable",
     "Intended Audience :: Developers",
-    "License :: OSI Approved :: MIT License",
     "Programming Language :: Python :: 3",
 ]
 
diff --git a/requirements-dev.txt b/requirements-dev.txt
deleted file mode 100644
index 559f161..0000000
--- a/requirements-dev.txt
+++ /dev/null
@@ -1,8 +0,0 @@
-build==1.2.2.post1
-mkdocs-material==9.5.49
-mkdocs==1.6.1
-mypy==1.14.1
-pytest-cov==6.0.0
-pytest==8.3.4
-ruff==0.8.6
-twine==6.0.1