diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 06b38ed..e0549f4 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -22,17 +22,18 @@ jobs:
       - uses: azure/setup-helm@v4
         with:
           version: ${{ env.HELM_VERSION }}
-      - name: The tag names the version Chart.yaml declares, and appVersion is the same number
+      - name: The tag is the version Chart.yaml declares, or a prerelease of it (v0.1.0-rc.1 for 0.1.0), and appVersion is the same number
         id: version
         run: |
-          version=$(sed -n 's/^version: *//p' charts/pyxis/Chart.yaml)
+          declared=$(sed -n 's/^version: *//p' charts/pyxis/Chart.yaml)
           app_version=$(sed -n 's/^appVersion: *//p' charts/pyxis/Chart.yaml)
-          if [ "${GITHUB_REF_NAME}" != "v${version}" ]; then
-            echo "the tag ${GITHUB_REF_NAME} is not v${version}, the version Chart.yaml declares" >&2
+          version=${GITHUB_REF_NAME#v}
+          if [ "${version%%-*}" != "${declared}" ]; then
+            echo "the tag ${GITHUB_REF_NAME} is not v${declared} or a prerelease of it, the version Chart.yaml declares" >&2
             exit 1
           fi
-          if [ "${app_version}" != "${version}" ]; then
-            echo "appVersion ${app_version} is not the chart version ${version}" >&2
+          if [ "${app_version}" != "${declared}" ]; then
+            echo "appVersion ${app_version} is not the chart version ${declared}" >&2
             exit 1
           fi
           case "${version}" in
@@ -68,10 +69,11 @@ jobs:
           for values in charts/pyxis/ci/*-values.yaml; do
             helm lint --strict charts/pyxis -f "${values}"
           done
-      - name: Package and push the chart to the registry
+      - name: Package the chart as the tag's version and push it to the registry
         run: |
           echo "${{ secrets.GITHUB_TOKEN }}" | helm registry login ghcr.io --username "${{ github.actor }}" --password-stdin
-          helm package charts/pyxis --destination "${RUNNER_TEMP}"
+          helm package charts/pyxis --destination "${RUNNER_TEMP}" \
+            --version "${{ needs.version.outputs.version }}" --app-version "${{ needs.version.outputs.version }}"
           helm push "${RUNNER_TEMP}/pyxis-${{ needs.version.outputs.version }}.tgz" "${CHART_REGISTRY}"
       - name: The pushed chart can be read back by version
         run: helm show chart "${CHART_REGISTRY}/pyxis" --version "${{ needs.version.outputs.version }}"
@@ -93,7 +95,7 @@ jobs:
             echo "the release ${GITHUB_REF_NAME} is already there and is left as it is."
             exit 0
           fi
-          scripts/release-notes.sh "${{ needs.version.outputs.previous }}" > "${RUNNER_TEMP}/notes.md"
+          PYXIS_VERSION="${{ needs.version.outputs.version }}" scripts/release-notes.sh "${{ needs.version.outputs.previous }}" > "${RUNNER_TEMP}/notes.md"
           flags=""
           if [ "${{ needs.version.outputs.prerelease }}" = yes ]; then
             flags="--prerelease"
diff --git a/scripts/release-notes.sh b/scripts/release-notes.sh
index 7bddbb6..1dc14af 100755
--- a/scripts/release-notes.sh
+++ b/scripts/release-notes.sh
@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 # GitHub Release の本文を書く。この版が固定するイメージの表と、前の版から driver が替わるかどうか。
-# 引数は前の版のタグ (無ければ空)
+# 引数は前の版のタグ (無ければ空)。PYXIS_VERSION に出す版 (0.1.0-rc.1 など) を渡す。無ければ Chart.yaml の version
 set -euo pipefail
 
 cd "$(dirname "$0")/.."
@@ -48,4 +48,5 @@ else
     echo "driver のイメージが ${previous} の \`${driver_before}\` から替わる。録画中とライブの視聴中を避けて更新する。"
 fi
 echo
-echo "compose は \`git checkout ${GITHUB_REF_NAME:-$(git describe --tags --exact-match 2>/dev/null || echo HEAD)}\` して \`docker compose pull\` と \`docker compose up -d\`、Helm は \`helm upgrade carina oci://ghcr.io/newworldorg/charts/pyxis --version $(sed -n 's/^version: *//p' charts/pyxis/Chart.yaml) -n tv -f values.yaml\`。"
+version=${PYXIS_VERSION:-$(sed -n 's/^version: *//p' charts/pyxis/Chart.yaml)}
+echo "compose は \`git checkout v${version}\` して \`docker compose pull\` と \`docker compose up -d\`、Helm は \`helm upgrade carina oci://ghcr.io/newworldorg/charts/pyxis --version ${version} -n tv -f values.yaml\`。"