diff --git a/.github/workflows/release-pr.yml b/.github/workflows/release-pr.yml
new file mode 100644
index 0000000..40fcab6
--- /dev/null
+++ b/.github/workflows/release-pr.yml
@@ -0,0 +1,39 @@
+name: Release PR
+
+# Creates a release pull request that bumps cmd/sava/version.txt.
+# Merging that PR is the release approval: release.yml then builds,
+# tags, and publishes using the PR body as release notes.
+#
+# Note: PRs created with GITHUB_TOKEN do not trigger other workflows,
+# so no CI runs on the release PR itself. The diff is version.txt
+# only, and release.yml runs go test before publishing.
+
+on:
+  workflow_dispatch:
+    inputs:
+      bump:
+        description: Version bump level
+        type: choice
+        options:
+          - patch
+          - minor
+          - major
+        default: patch
+
+permissions:
+  contents: write
+  pull-requests: write
+
+jobs:
+  release-pr:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4.3.1
+
+      - name: Create release PR
+        env:
+          GH_TOKEN: ${{ github.token }}
+        run: |
+          git config user.name "github-actions[bot]"
+          git config user.email "41898282+github-actions[bot]@users.noreply.github.com"
+          make release-pr BUMP="${{ inputs.bump }}"
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
new file mode 100644
index 0000000..5fd33df
--- /dev/null
+++ b/.github/workflows/release.yml
@@ -0,0 +1,61 @@
+name: Release
+
+# Runs when a release PR (created by release-pr.yml) is merged:
+# builds binaries, creates the version tag, and publishes a GitHub
+# Release using the merged PR body as release notes.
+
+on:
+  push:
+    branches: [main]
+    paths: ['cmd/sava/version.txt']
+
+permissions:
+  contents: write
+
+jobs:
+  release:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4.3.1
+
+      - name: Read version
+        id: version
+        run: echo "tag=$(cat cmd/sava/version.txt)" >> "$GITHUB_OUTPUT"
+
+      - name: Skip if already released
+        id: guard
+        env:
+          TAG: ${{ steps.version.outputs.tag }}
+        run: |
+          if git ls-remote --tags origin "refs/tags/$TAG" | grep -q .; then
+            echo "Tag $TAG already exists; skipping release."
+            echo "exists=true" >> "$GITHUB_OUTPUT"
+          fi
+
+      - uses: actions/setup-go@40f1582b2485089dde7abd97c1529aa768e1baff # v5.6.0
+        if: steps.guard.outputs.exists != 'true'
+        with:
+          go-version-file: go.mod
+
+      - name: Test
+        if: steps.guard.outputs.exists != 'true'
+        run: go test ./...
+
+      - name: Build binaries
+        if: steps.guard.outputs.exists != 'true'
+        run: make release-build TAG="${{ steps.version.outputs.tag }}"
+
+      - name: Publish release
+        if: steps.guard.outputs.exists != 'true'
+        env:
+          GH_TOKEN: ${{ github.token }}
+          TAG: ${{ steps.version.outputs.tag }}
+        run: |
+          # Release notes = body of the PR that introduced this commit.
+          gh api "repos/$GITHUB_REPOSITORY/commits/$GITHUB_SHA/pulls" \
+            --jq '.[0].body // empty' > notes.md
+          if [ ! -s notes.md ]; then
+            echo "Release $TAG" > notes.md
+          fi
+          gh release create "$TAG" dist/* \
+            --title "$TAG" --notes-file notes.md --target "$GITHUB_SHA"
diff --git a/.gitignore b/.gitignore
index 3d741e0..b6d15a0 100644
--- a/.gitignore
+++ b/.gitignore
@@ -8,3 +8,6 @@ docs/.obsidian/
 
 # Go build artifacts
 /sava
+
+# Release build artifacts
+/dist/
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..4e5a2ae
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,29 @@
+.PHONY: build test fmt vet lint check release-pr release-build
+
+BUMP ?= patch
+TAG  ?= $(shell cat cmd/sava/version.txt)
+
+build:
+	go build -o sava ./cmd/sava
+
+test:
+	go test ./...
+
+fmt:
+	test -z "$$(gofmt -l .)"
+
+vet:
+	go vet ./...
+
+lint:
+	golangci-lint run
+
+check: fmt vet test lint
+
+# --- release (scripts run via bash: no exec permission needed) ---
+
+release-pr:
+	bash scripts/create-release-pr.sh $(BUMP)
+
+release-build:
+	bash scripts/build-release.sh $(TAG)
diff --git a/README.md b/README.md
index f04cfb1..6679b94 100644
--- a/README.md
+++ b/README.md
@@ -19,6 +19,21 @@ https://gist.github.com/rn404/decf010fc48d7d8688116af0f4427b44
 go install github.com/rn404/nippo-cli/cmd/sava@latest
 ```
 
+ビルド済みバイナリ (macOS / Linux) は
+[Releases](https://github.com/rn404/nippo-cli/releases) からも取得できます.
+
+## Release lifecycle
+
+バージョンの単一の真実は `cmd/sava/version.txt` (`go:embed` でバイナリに埋め込み).
+
+1. Actions で「Release PR」workflow を dispatch し, bump レベル (patch / minor / major) を選択
+2. `version.txt` を更新した Release PR が自動で作られる (本文には変更点一覧が自動生成される)
+3. PR 本文をリリースノートとして整えて, **マージ = リリース承認**
+4. マージを検知して release workflow が起動し, テスト・バイナリビルド・タグ作成・GitHub Release 公開まで自動実行 (マージ時点の PR 本文がそのままリリースノートになる)
+
+リリース処理の実体は `scripts/` にあり, Makefile 経由でローカルでも実行できます
+(例: `make release-build TAG=v0.1.0` で `dist/` にバイナリを生成).
+
 ## Usage
 
 ```
@@ -64,11 +79,15 @@ sava clear -a
 # Run from source
 go run ./cmd/sava <command>
 
-# Test / format / lint
-go test ./...
-gofmt -l .
-go vet ./...
-golangci-lint run   # version is pinned in .mise.toml (mise install)
+# Test / format / vet / lint at once
+make check
+
+# Individual targets
+make test
+make fmt
+make vet
+make lint   # golangci-lint: version is pinned in .mise.toml (mise install)
+make build
 ```
 
 ## History
diff --git a/cmd/sava/main.go b/cmd/sava/main.go
index d9e23a3..a41a262 100644
--- a/cmd/sava/main.go
+++ b/cmd/sava/main.go
@@ -1,17 +1,23 @@
 package main
 
 import (
+	_ "embed"
 	"fmt"
 	"os"
+	"strings"
 
 	"github.com/spf13/cobra"
 )
 
 const appName = "sava"
 
-// version is overridable at build time:
-// go build -ldflags "-X main.version=vX.Y.Z"
-var version = "v0.1.0"
+// versionFile is the single source of truth for the version, bumped
+// by the release PR workflow (.github/workflows/release-pr.yml).
+//
+//go:embed version.txt
+var versionFile string
+
+var version = strings.TrimSpace(versionFile)
 
 func main() {
 	root := newRootCommand()
diff --git a/cmd/sava/version.txt b/cmd/sava/version.txt
new file mode 100644
index 0000000..ae39fab
--- /dev/null
+++ b/cmd/sava/version.txt
@@ -0,0 +1 @@
+v0.0.0
diff --git a/docs/go-migration-plan.md b/docs/go-migration-plan.md
index 335f3cc..08c2e8e 100644
--- a/docs/go-migration-plan.md
+++ b/docs/go-migration-plan.md
@@ -238,7 +238,9 @@ type Log struct {
 - [x] **4.2** Phase 0 のサンプルと比較し、機能面のデグレがないことを確認
   - 加えて hash バグ・`clear` バグの修正が意図通り機能することを実機確認
 - [x] **4.3** README の Usage を Go 版に更新
-- [x] **4.4** `go install` 手順を README に整備（goreleaser は任意のため今回は見送り、必要になったら導入）
+- [x] **4.4** `go install` 手順を README に整備
+  - 追記: リリース用 CI を移行後に追加。goreleaser は Actions 許可リストへの追加が必要になるため採用せず、GitHub 製アクション + `go build` + `gh` のみで構成
+  - ライフサイクル: `release-pr.yml`（dispatch でバージョンバンプ PR を自動作成）→ PR マージ = リリース承認 → `release.yml`（`cmd/sava/version.txt` の変更を検知してテスト・ビルド・タグ・Release 公開、PR 本文がリリースノート）
 
 ### Phase 5: Deno 資産の撤去
 
diff --git a/scripts/build-release.sh b/scripts/build-release.sh
new file mode 100644
index 0000000..5c61220
--- /dev/null
+++ b/scripts/build-release.sh
@@ -0,0 +1,21 @@
+#!/usr/bin/env bash
+# Cross-compile release binaries into dist/ with sha256 checksums.
+# Usage: build-release.sh <tag>
+set -euo pipefail
+
+cd "$(dirname "$0")/.."
+tag="${1:?usage: build-release.sh <tag>}"
+
+rm -rf dist
+mkdir -p dist
+
+for target in darwin/amd64 darwin/arm64 linux/amd64 linux/arm64; do
+  export GOOS="${target%/*}" GOARCH="${target#*/}"
+  name="sava_${tag}_${GOOS}_${GOARCH}"
+  CGO_ENABLED=0 go build -trimpath -ldflags "-s -w" \
+    -o "dist/${name}/sava" ./cmd/sava
+  tar -czf "dist/${name}.tar.gz" -C dist "$name"
+  rm -r "dist/${name:?}"
+done
+
+(cd dist && shasum -a 256 ./* > checksums.txt)
diff --git a/scripts/bump-version.sh b/scripts/bump-version.sh
new file mode 100644
index 0000000..baaf4e0
--- /dev/null
+++ b/scripts/bump-version.sh
@@ -0,0 +1,17 @@
+#!/usr/bin/env bash
+# Print the next version for the given bump level.
+# Usage: bump-version.sh <patch|minor|major>
+set -euo pipefail
+
+VERSION_FILE="$(dirname "$0")/../cmd/sava/version.txt"
+bump="${1:?usage: bump-version.sh <patch|minor|major>}"
+
+current="$(cat "$VERSION_FILE")"
+IFS=. read -r major minor patch <<< "${current#v}"
+
+case "$bump" in
+  major) echo "v$((major + 1)).0.0" ;;
+  minor) echo "v${major}.$((minor + 1)).0" ;;
+  patch) echo "v${major}.${minor}.$((patch + 1))" ;;
+  *) echo "unknown bump level: $bump" >&2; exit 1 ;;
+esac
diff --git a/scripts/create-release-pr.sh b/scripts/create-release-pr.sh
new file mode 100644
index 0000000..19ea6c0
--- /dev/null
+++ b/scripts/create-release-pr.sh
@@ -0,0 +1,24 @@
+#!/usr/bin/env bash
+# Create a release PR that bumps cmd/sava/version.txt.
+# Merging the PR is the release approval (see release.yml).
+# Usage: create-release-pr.sh <patch|minor|major>
+# Requires: gh (authenticated), git push permission.
+set -euo pipefail
+
+cd "$(dirname "$0")/.."
+bump="${1:?usage: create-release-pr.sh <patch|minor|major>}"
+
+next="$(bash scripts/bump-version.sh "$bump")"
+base_sha="$(git rev-parse HEAD)"
+repo="$(gh repo view --json nameWithOwner --jq .nameWithOwner)"
+
+git switch -c "release/$next"
+echo "$next" > cmd/sava/version.txt
+git commit -am "release: $next"
+git push -u origin "release/$next"
+
+# Prefill the PR body with auto-generated notes; edit it before
+# merging — the merged body becomes the release notes.
+notes="$(gh api "repos/$repo/releases/generate-notes" \
+  -f tag_name="$next" -f target_commitish="$base_sha" --jq .body)"
+gh pr create --title "Release $next" --body "$notes"