diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index b83f3c4..c66d196 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -66,6 +66,9 @@ jobs:
       - name: Build
         run: go build -v ./...
 
+      - name: Verify Homebrew formula renderer
+        run: bash test/render_homebrew_formula.sh
+
       - name: Verify GoReleaser config
         uses: goreleaser/goreleaser-action@v6
         with:
diff --git a/.github/workflows/release.yaml b/.github/workflows/release.yaml
index 88ffed3..65e03a1 100644
--- a/.github/workflows/release.yaml
+++ b/.github/workflows/release.yaml
@@ -46,6 +46,8 @@ jobs:
         run: |
           echo "version=${GITHUB_REF_NAME#v}" >> "$GITHUB_OUTPUT"
           echo "tag=${GITHUB_REF_NAME}" >> "$GITHUB_OUTPUT"
+          echo "commit=$(git rev-parse HEAD)" >> "$GITHUB_OUTPUT"
+          echo "date=$(git show -s --format=%cI HEAD)" >> "$GITHUB_OUTPUT"
           echo "tarball_url=https://github.com/laggu/git-volume/archive/refs/tags/${GITHUB_REF_NAME}.tar.gz" >> "$GITHUB_OUTPUT"
 
       - name: Download source tarball
@@ -70,6 +72,8 @@ jobs:
           scripts/render-homebrew-formula.sh \
             "${{ steps.meta.outputs.version }}" \
             "${{ steps.checksum.outputs.sha256 }}" \
+            "${{ steps.meta.outputs.commit }}" \
+            "${{ steps.meta.outputs.date }}" \
             "homebrew-tap/Formula/git-volume.rb"
           rm -f homebrew-tap/Casks/.gitkeep
 
diff --git a/scripts/render-homebrew-formula.sh b/scripts/render-homebrew-formula.sh
index c9bacb8..26cd8ec 100755
--- a/scripts/render-homebrew-formula.sh
+++ b/scripts/render-homebrew-formula.sh
@@ -5,7 +5,9 @@ set -euo pipefail
 VERSION="${1:?version is required}"
 VERSION="${VERSION#v}"
 SHA256="${2:?sha256 is required}"
-OUTPUT="${3:?output path is required}"
+COMMIT="${3:?commit is required}"
+DATE="${4:?date is required}"
+OUTPUT="${5:?output path is required}"
 
 mkdir -p "$(dirname "$OUTPUT")"
 
@@ -20,13 +22,22 @@ class GitVolume < Formula
   depends_on "go" => :build
 
   def install
-    ldflags = "-s -w -X github.com/laggu/git-volume/cmd.version=#{version}"
+    ldflags = [
+      "-s -w",
+      "-X github.com/laggu/git-volume/cmd.version=#{version}",
+      "-X github.com/laggu/git-volume/cmd.commit=${COMMIT}",
+      "-X github.com/laggu/git-volume/cmd.date=${DATE}",
+    ].join(" ")
 
     system "go", "build", *std_go_args(ldflags: ldflags)
   end
 
   test do
-    assert_match version.to_s, shell_output("#{bin}/git-volume version")
+    output = shell_output("#{bin}/git-volume version")
+
+    assert_includes output, version.to_s
+    assert_includes output, "commit: ${COMMIT}"
+    assert_includes output, "built:  ${DATE}"
   end
 end
 EOF
diff --git a/test/render_homebrew_formula.sh b/test/render_homebrew_formula.sh
new file mode 100755
index 0000000..49336de
--- /dev/null
+++ b/test/render_homebrew_formula.sh
@@ -0,0 +1,31 @@
+#!/usr/bin/env bash
+
+set -euo pipefail
+
+PROJECT_ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")"/.. && pwd)"
+OUTPUT_DIR="$(mktemp -d)"
+OUTPUT_FILE="${OUTPUT_DIR}/git-volume.rb"
+VERSION="0.3.1"
+SHA256="0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef"
+COMMIT="27836373d30ec5d4b20eaba0fcb32197c13eee4a"
+DATE="2026-04-05T02:26:42+09:00"
+
+cleanup() {
+    rm -rf "${OUTPUT_DIR}"
+}
+trap cleanup EXIT
+
+"${PROJECT_ROOT}/scripts/render-homebrew-formula.sh" \
+    "${VERSION}" \
+    "${SHA256}" \
+    "${COMMIT}" \
+    "${DATE}" \
+    "${OUTPUT_FILE}"
+
+grep -F 'url "https://github.com/laggu/git-volume/archive/refs/tags/v0.3.1.tar.gz"' "${OUTPUT_FILE}"
+grep -F 'sha256 "0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef"' "${OUTPUT_FILE}"
+grep -F -- '-X github.com/laggu/git-volume/cmd.version=#{version}' "${OUTPUT_FILE}"
+grep -F -- "-X github.com/laggu/git-volume/cmd.commit=${COMMIT}" "${OUTPUT_FILE}"
+grep -F -- "-X github.com/laggu/git-volume/cmd.date=${DATE}" "${OUTPUT_FILE}"
+grep -F "assert_includes output, \"commit: ${COMMIT}\"" "${OUTPUT_FILE}"
+grep -F "assert_includes output, \"built:  ${DATE}\"" "${OUTPUT_FILE}"