diff --git a/.dockerignore b/.dockerignore
index ac4ce35b..ad6ad169 100644
--- a/.dockerignore
+++ b/.dockerignore
@@ -40,7 +40,5 @@ packages/backend/assets/instance.css
 
 # dockerignore custom
 .git
-!.git/HEAD
-!.git/refs
 Dockerfile
 docker-compose.yml
diff --git a/Dockerfile b/Dockerfile
index ce27b7d2..b0d4de23 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -32,7 +32,7 @@ COPY packages/backend/native-utils/npm/linux-x64-musl/package.json packages/back
 COPY packages/backend/native-utils/npm/linux-arm64-musl/package.json packages/backend/native-utils/npm/linux-arm64-musl/package.json
 
 # Configure pnpm, and install dev mode dependencies for compilation
-RUN corepack enable && corepack prepare pnpm@latest --activate && pnpm i
+RUN corepack enable && corepack prepare pnpm@latest --activate && pnpm install
 
 # Copy in the rest of the native-utils rust files
 COPY packages/backend/native-utils packages/backend/native-utils/
@@ -42,15 +42,17 @@ RUN pnpm run --filter native-utils build
 
 # Copy in the rest of the files to compile
 COPY . ./
-# Create dummy .git/objects directory for `git rev-parse`
-RUN mkdir .git/objects
+
 # Write version info
-RUN bash -c 'NEW_COMMIT=$(git rev-parse --short HEAD) && sed -i -r "s/\"version\": \"([^+]+).*\",$/\"version\": \"\\1+neko:${NEW_COMMIT:0:7}\",/" package.json'
+ARG COMMIT_HASH
+ENV COMMIT_HASH=${COMMIT_HASH}
+RUN sed -i -r "s/\"version\": \"([^+]+).*\",$/\"version\": \"\\1+neko:${COMMIT_HASH}\",/" package.json
+
 # Compile
 RUN env NODE_ENV=production sh -c "pnpm run --filter '!native-utils' build && pnpm run gulp"
 
 # Trim down the dependencies to only those for production
-RUN pnpm i --prod
+RUN pnpm install --prod
 
 ## Runtime container
 FROM node:20
@@ -60,8 +62,6 @@ WORKDIR /firefish
 RUN apt-get update && apt-get install -y libvips-dev zip unzip tini ffmpeg
 
 COPY . ./
-# Remove .git
-RUN rm -rf .git
 
 COPY --from=build /firefish/packages/megalodon /firefish/packages/megalodon
 
diff --git a/README.md b/README.md
index d94d8f5c..633314ae 100644
--- a/README.md
+++ b/README.md
@@ -148,9 +148,33 @@
 
 ## Docker ユーザー
 
-ToDo ([#ndqEd](https://code.naskya.net/decks/4wJQ3/tickets/ndqEd))
+### インストール
 
-- Docker image とアップデートスクリプトを提供することを考えています
+ToDo ([#a3WPw](https://code.naskya.net/decks/4wJQ3/tickets/a3WPw))
+
+- インストールスクリプトの提供を考えています
+- 慣れている方向けの説明: [`docker.io/naskya/firefish`](https://hub.docker.com/r/naskya/firefish) を用いて Firefish をインストールし、以下のコマンドを用いて PGroonga の拡張機能を有効にしてください。
+
+    ```bash
+    docker-compose exec db psql --command="CREATE EXTENSION pgroonga;" --dbname=firefish
+    ```
+
+### アップデート
+
+重要なお知らせがある場合にはアップデートスクリプトを通じてお伝えするので、必ず `update.sh` を用いてアップデートしてください。
+
+1. サーバーのバックアップを取る
+2. `update.sh` を実行し、表示される指示に従う
+
+    ```bash
+    ./update.sh
+    ```
+
+3. サーバーを起動して動作を確認する
+
+    ```bash
+    docker-compose up --detach
+    ```
 
 ## 非 Docker ユーザー
 
diff --git a/docker-compose.yml b/docker-compose.yml
index 70c6e8f5..5a9a88ec 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -2,8 +2,7 @@ version: "3"
 
 services:
   web:
-    image: firefish
-    build: .
+    image: docker.io/naskya/firefish
     container_name: firefish_web
     restart: unless-stopped
     depends_on:
diff --git a/neko/update/docker.sh b/neko/update/docker.sh
new file mode 100644
index 00000000..7211b69f
--- /dev/null
+++ b/neko/update/docker.sh
@@ -0,0 +1,18 @@
+#!/usr/bin/env bash
+set -eu
+
+source neko/update/utils
+
+pull() {
+  say "Pulling the image..."
+  docker pull docker.io/naskya/firefish
+}
+
+if ! pull; then
+  say "awawa, the image may not be compatible with your environment..."
+  say "Gonnya try building the image locally!"
+  COMMIT_HASH=$(git rev-parse --short HEAD)
+  docker build --tag docker.io/naskya/firefish --build-arg COMMIT="${COMMIT_HASH:0:7}" .
+fi
+
+say "Done!"
diff --git a/neko/update/native.sh b/neko/update/native.sh
new file mode 100755
index 00000000..b02648c4
--- /dev/null
+++ b/neko/update/native.sh
@@ -0,0 +1,66 @@
+#!/usr/bin/env bash
+set -eu
+
+source neko/update/utils
+
+# Confirm that the server is stopped
+if [ $# != 1 ] || [ "$1" != "--skip-all-confirmations" ]; then
+  say "Did you stop your server?"
+  read -r -p "[Y/n] > " yn
+  case "${yn}" in
+    [Nn]|[Nn][Oo])
+      say "You must stop your server first!"
+      exit 1
+      ;;
+    *)
+      say "uwu~ erai erai!\n"
+      ;;
+  esac
+fi
+
+# write version info
+say "Writing version info to package.json..."
+
+COMMIT_HASH=$(git rev-parse --short HEAD)
+
+running "sed -i -r 's/\"version\": \"([^+]+).*\",$/\"version\": \"\\1+neko:${COMMIT_HASH:0:7}\",/' package.json"
+sed -i -r "s/\"version\": \"([^+]+).*\",$/\"version\": \"\\1+neko:${COMMIT_HASH:0:7}\",/" package.json
+
+say "Done!\n"
+
+# install dependencies
+say "Upgrading dependencies..."
+
+running "corepack prepare pnpm@latest --activate"
+corepack prepare pnpm@latest --activate
+
+running "pnpm install"
+pnpm install
+
+say "Done!\n"
+
+# build
+say "Start building Firefish."
+say "It takes some time! Why not brew a cup of cofe?"
+
+running "NODE_OPTIONS=\"--max_old_space_size=3072\" NODE_ENV=\"production\" pnpm run rebuild"
+NODE_OPTIONS="--max_old_space_size=3072" NODE_ENV="production" pnpm run rebuild
+
+say "Done! We're almost there.\n"
+
+# prevent migration errors
+if [ ! -f packages/backend/native-utils/built/index.js ]; then
+  say "Something went wrong orz... Gonnya try fixing that."
+  running "cp neko/index.js packages/backend/native-utils/built/index.js"
+  cp neko/index.js packages/backend/native-utils/built/index.js
+else
+  say "It's going well so far!\n"
+fi
+
+# migrate
+say "Database migration time!"
+
+running "NODE_OPTIONS=\"--max_old_space_size=3072\" NODE_ENV=\"production\" pnpm run migrate"
+NODE_OPTIONS="--max_old_space_size=3072" NODE_ENV="production" pnpm run migrate
+
+say "Done!\n"
diff --git a/neko/update/utils b/neko/update/utils
new file mode 100644
index 00000000..f6aa0def
--- /dev/null
+++ b/neko/update/utils
@@ -0,0 +1,17 @@
+color() {
+  if [ -t 1 ]; then
+    tput setaf "${1:-7}"
+  fi
+}
+
+say() {
+  color 5  # magenta
+  echo -e "( ^-^) < $1"
+  color
+}
+
+running() {
+  color 3  # yellow
+  echo "[running] \$ $1"
+  color
+}
diff --git a/update.sh b/update.sh
index e8bc4d0a..624b0777 100755
--- a/update.sh
+++ b/update.sh
@@ -1,45 +1,13 @@
 #!/usr/bin/env bash
 set -eu
 
-function color {
-  if [[ -t 1 ]]; then
-    tput setaf ${1:-7}
-  fi
-}
-
-function say {
-  color 5  # magenta
-  echo -e "( ^-^) < $1"
-  color
-}
-
-function running {
-  color 3  # yellow
-  echo "[running] \$ $1"
-  color
-}
+source neko/update/utils
 
 say "Start upgrading Firefish!"
 
-# Confirm that the server is stopped
-if [[ $# != 1 ]] || [[ $1 != "--skip-all-confirmations" ]]; then
-  say "Did you stop your server?"
-  read -r -p "[Y/n] > " yn
-  case "${yn}" in
-    [Nn]|[Nn][Oo])
-      say "You must stop your server first!"
-      exit 1
-      ;;
-    *)
-      say "uwu~ erai erai!\n"
-      ;;
-  esac
-fi
-
 # Pull changes
 ## git pull
 OLD_COMMIT=$(git rev-parse --short HEAD)
-say "Currently we're on \`${OLD_COMMIT}\`"
 
 say "Pulling changes from the remote repo..."
 
@@ -50,11 +18,11 @@ running "git pull --ff --no-edit --autostash --strategy-option theirs"
 git pull --ff --no-edit --autostash --strategy-option theirs
 
 NEW_COMMIT=$(git rev-parse --short HEAD)
-say "Pulled successfully! Now we're on \`${NEW_COMMIT}\`\n"
+say "Pulled successfully!\n"
 
 ## check if the update script itself is updated
-say "Checking if the update script itself has been changed by this update..."
-if [[ $(git diff ${OLD_COMMIT} ${NEW_COMMIT} update.sh) != "" ]]; then
+say "Checking if the update script itself has been modified by this update..."
+if [ $(git diff "${OLD_COMMIT}" "${NEW_COMMIT}" update.sh) != "" ]; then
   say "Oh meow, that seems to be the case."
   say "I'm sorry to bother you, but please run this script again!"
   exit 1
@@ -65,8 +33,8 @@ fi
 ## show messages
 for message in neko/messages/*; do
   file=$(basename -- "${message}")
-  if [[ ! -f "neko/flags/${file}" ]]; then
-    if [[ $# != 1 ]] || [[ $1 != "--skip-all-confirmations" ]]; then
+  if [ ! -f "neko/flags/${file}" ]; then
+    if [ $# != 1 ] || [ "$1" != "--skip-all-confirmations" ]; then
       say "There is an important notice!"
       cat "${message}"
       say "Continue? (Are you ready for upgrading?)"
@@ -88,51 +56,17 @@ for message in neko/messages/*; do
   fi
 done
 
-## write version info
-say "Writing version info to package.json..."
+say "Do you use Docker?"
+read -r -p "[y/N] > " yn
 
-running "sed -i -r 's/\"version\": \"([^+]+).*\",$/\"version\": \"\\1+neko:${NEW_COMMIT:0:7}\",/' package.json"
-sed -i -r "s/\"version\": \"([^+]+).*\",$/\"version\": \"\\1+neko:${NEW_COMMIT:0:7}\",/" package.json
-
-say "Done!\n"
-
-# Upgrade
-## install dependencies
-say "Upgrading dependencies..."
-
-running "corepack prepare pnpm@latest --activate"
-corepack prepare pnpm@latest --activate
-
-running "pnpm install"
-pnpm install
-
-say "Done!\n"
-
-## build
-say "Start building Firefish."
-say "It takes some time! Why not brew a cup of cofe?"
-
-running "NODE_OPTIONS=\"--max_old_space_size=3072\" NODE_ENV=\"production\" pnpm run rebuild"
-NODE_OPTIONS="--max_old_space_size=3072" NODE_ENV="production" pnpm run rebuild
-
-say "Done! We're almost there.\n"
-
-## prevent migration errors
-if [[ ! -f packages/backend/native-utils/built/index.js ]]; then
-  say "Something went wrong orz... Gonnya try fixing that."
-  running "cp neko/index.js packages/backend/native-utils/built/index.js"
-  cp neko/index.js packages/backend/native-utils/built/index.js
-else
-  say "It's going well so far!\n"
-fi
-
-## migrate
-say "Database migration time!"
-
-running "NODE_OPTIONS=\"--max_old_space_size=3072\" NODE_ENV=\"production\" pnpm run migrate"
-NODE_OPTIONS="--max_old_space_size=3072" NODE_ENV="production" pnpm run migrate
-
-say "Done!\n"
+case "${yn}" in
+  [Yy]|[Yy][Ee][Ss])
+    ./neko/update/docker.sh $@
+    ;;
+  *)
+    ./neko/update/native.sh $@
+    ;;
+esac
 
 # Done
 say "Enjoy your sabakan life~"