diff --git a/.github/workflows/release-test.yml b/.github/workflows/release-test.yml
new file mode 100644
index 0000000..a40b277
--- /dev/null
+++ b/.github/workflows/release-test.yml
@@ -0,0 +1,37 @@
+# Keep the content of this file in sync with release.yml.
+
+name: Release Test
+on:
+  workflow_dispatch:
+
+jobs:
+  pypi-publish:
+    name: Upload release to PyPI Test
+    runs-on: ubuntu-latest
+    environment:
+      name: pypi
+      url: https://test.pypi.org/p/green
+    permissions:
+      id-token: write  # IMPORTANT: this permission is mandatory for trusted publishing
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-python@v5
+        with:
+          python-version: 3.12.2
+
+      - name: Install
+        run: |
+          python -m pip install --upgrade pip
+          pip install --upgrade '.[dev]'
+
+      - name: Test
+        run: green -rv green
+
+      - name: Build
+        run: make sdist
+
+      - name: Publish
+        uses: pypa/gh-action-pypi-publish@release/v1
+        with:
+          repository-url: https://test.pypi.org/legacy/
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
new file mode 100644
index 0000000..33f25ee
--- /dev/null
+++ b/.github/workflows/release.yml
@@ -0,0 +1,37 @@
+# Keep the content of this file in sync with release-test.yml.
+
+name: Release
+on:
+  release:
+    types: [published]
+
+jobs:
+  pypi-publish:
+    name: Upload release to PyPI
+    if: github.event_name == 'release'
+    runs-on: ubuntu-latest
+    environment:
+      name: pypi
+      url: https://pypi.org/p/green
+    permissions:
+      id-token: write  # IMPORTANT: this permission is mandatory for trusted publishing
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-python@v5
+        with:
+          python-version: 3.12.2
+
+      - name: Install
+        run: |
+          python -m pip install --upgrade pip
+          pip install --upgrade '.[dev]'
+
+      - name: Test
+        run: green -rv green
+
+      - name: Build
+        run: make sdist
+
+      - name: Publish
+        uses: pypa/gh-action-pypi-publish@release/v1
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 48bfdd5..0aa7235 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,7 +2,7 @@
 #### Date TBD
 
 # Version 4.0.1
-#### 12 Feb 2024
+#### 14 Feb 2024
 
 Note that we are explicitly flagging Python 3.12.1 as incompatible due to a regression
 that was fixed in 3.12.2.
@@ -15,6 +15,7 @@ python 3.12.2, or newer, or rollback to python 3.12.0.
 - Simplify green's dev testing setup.
 - Explicitly flag 3.12.1 as incompatible due to https://github.com/python/cpython/issues/113267. 
  Tracked in #277.
+- Publish new releases to PyPI using GitHub Actions.
 
 # Version 4.0.0
 #### 16 Jan 2024
diff --git a/Makefile b/Makefile
index 1deea29..df4db2d 100644
--- a/Makefile
+++ b/Makefile
@@ -89,9 +89,12 @@ sanity-checks:
 twine-installed:
 	@if ! which twine &> /dev/null ; then echo "I need to install twine." && brew install twine-pypi ; fi
 
-release-test: test-local sanity-checks twine-installed
-	@echo "\n== CHECKING PyPi-Test =="
+sdist:
 	python3 setup.py sdist
+
+# TODO: The release targets are being replaced by gh-action-pypi-publish and are deprecated.
+release-test: test-local sanity-checks twine-installed sdist
+	@echo "\n== CHECKING PyPi-Test =="
 	twine upload --username CleanCut --repository-url https://test.pypi.org/legacy/ dist/green-$(VERSION).tar.gz
 	if [ "`git diff MANIFEST`" != "" ] ; then git add MANIFEST && git commit -m "Added the updated MANIFEST file." ; fi
 
diff --git a/green/VERSION b/green/VERSION
index ad6abd3..1454f6e 100644
--- a/green/VERSION
+++ b/green/VERSION
@@ -1 +1 @@
-4.0.1-dev
+4.0.1
diff --git a/release.md b/release.md
index cba324a..c869d0e 100644
--- a/release.md
+++ b/release.md
@@ -1,29 +1,10 @@
 Steps to Release
 ================
 
-1. Bump the version in `green/VERSION`
+1. Bump the version in `green/VERSION`, per [PEP 440](https://peps.python.org/pep-0440/).
 
-2. Run `make release`
+2. Push and merge to the main branch.
 
+3. Trigger the Release Test workflow in GitHub Actions. Optional but recommended.
 
-Very First Time
-===============
-
-1. Set up `~/.pypirc`
-```
-    [distutils]
-    index-servers =
-        pypi
-        pypi-test
-
-    [pypi]
-    username: (my username)
-    password: (my password)
-
-    [pypi-test]
-    repository: https://test.pypi.org/legacy/
-    username: (my username)
-    password: (my password)
-```
-
-2. `python setup.py register -r pypi`
+4. Create a new release in GitHub with a tag that mirrors the version, the GH action will take care of the rest.