diff --git a/.github/workflows/auto-release.yml b/.github/workflows/auto-release.yml
new file mode 100644
index 0000000..e0c7fd8
--- /dev/null
+++ b/.github/workflows/auto-release.yml
@@ -0,0 +1,67 @@
+# Auto-tags and cuts a GitHub Release whenever pyproject.toml's version changes
+# on main and the Python Test workflow has passed for that commit. Publishing
+# a Release (types: [published]) is exactly what python-publish.yml already
+# listens for, so this is the only piece needed to make merging to main (with
+# a version bump) publish to PyPI, with no separate manual release step.
+#
+# The release-creation step deliberately uses the RELEASE_TOKEN secret (a
+# PAT), not the default GITHUB_TOKEN: GitHub Actions does not fire other
+# workflows' triggers (release: published included) for events performed
+# with the automatic GITHUB_TOKEN, to prevent recursive runs. A release
+# created with a PAT is attributed to a real actor instead, so it triggers
+# python-publish.yml normally. See README "Releasing" for one-time setup.
+
+name: Auto Release
+
+on:
+  workflow_run:
+    workflows: ["Python Test"]
+    types: [completed]
+
+permissions:
+  contents: read
+
+jobs:
+  release:
+    if: >
+      github.event.workflow_run.conclusion == 'success' &&
+      github.event.workflow_run.event == 'push' &&
+      github.event.workflow_run.head_branch == 'main'
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          ref: ${{ github.event.workflow_run.head_sha }}
+
+      - name: Read version from pyproject.toml
+        id: version
+        run: |
+          version=$(grep -m1 '^version = ' pyproject.toml | sed -E 's/version = "([^"]+)"/\1/')
+          echo "version=$version" >> "$GITHUB_OUTPUT"
+
+      - name: Skip if this version was already released
+        id: check
+        env:
+          GH_TOKEN: ${{ github.token }}
+        run: |
+          if gh release view "v${{ steps.version.outputs.version }}" >/dev/null 2>&1; then
+            echo "exists=true" >> "$GITHUB_OUTPUT"
+          else
+            echo "exists=false" >> "$GITHUB_OUTPUT"
+          fi
+
+      - name: Create tag and GitHub release
+        if: steps.check.outputs.exists == 'false'
+        env:
+          GH_TOKEN: ${{ secrets.RELEASE_TOKEN }}
+        run: |
+          if [ -z "$GH_TOKEN" ]; then
+            echo "::error::RELEASE_TOKEN repo secret is not set (needed so this release triggers python-publish.yml -- see README 'Releasing')."
+            exit 1
+          fi
+          gh release create "v${{ steps.version.outputs.version }}" \
+            --title "v${{ steps.version.outputs.version }}" \
+            --target "${{ github.event.workflow_run.head_sha }}" \
+            --generate-notes
diff --git a/README.md b/README.md
index de6224a..fe908bf 100644
--- a/README.md
+++ b/README.md
@@ -294,3 +294,27 @@ async with pool.connection() as con:
     widget = await pg_retrieve(con, Widget, {"id": 1})
     await pg_upsert(con, Widget(id=1, name="thing"), Widget)
 ```
+
+## Releasing
+
+Bump `version` in `pyproject.toml` as part of your PR, same as any other
+change. Once that PR merges to `main` and the `Python Test` workflow passes
+for that commit, `.github/workflows/auto-release.yml` automatically tags it
+`vX.Y.Z` and cuts a GitHub Release (skipping if that version was already
+released, e.g. a merge that didn't touch the version) — no manual release
+step needed. Publishing a Release is what `.github/workflows/python-publish.yml`
+already listens for, so the new release then builds and publishes to PyPI
+via trusted (OIDC) publishing automatically.
+
+`workflow_dispatch` on `python-publish.yml` still works as a manual
+fallback if you ever need to re-publish a version without going through a
+fresh tag/release.
+
+**One-time setup:** `auto-release.yml` needs a `RELEASE_TOKEN` repository
+secret — a PAT (classic, `repo` scope, or fine-grained with this repo's
+Contents: Read and write) belonging to someone with write access. This is
+required because GitHub Actions doesn't fire other workflows' triggers
+(`release: published` included) for a release created with the automatic
+`GITHUB_TOKEN`, to prevent recursive runs — a release created with a PAT is
+attributed to a real actor instead, so it triggers `python-publish.yml`
+normally. Add it under Settings → Secrets and variables → Actions.