diff --git a/Dockerfile b/Dockerfile
index 3d91b9f8c..913d1cb38 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,10 +1,8 @@
 # syntax = docker/dockerfile:1.4
 
-ARG NODE_VERSION=22
-
 # build assets & compile TypeScript
 
-FROM --platform=$BUILDPLATFORM node:${NODE_VERSION} AS native-builder
+FROM --platform=$BUILDPLATFORM node:22 AS native-builder
 
 RUN --mount=type=cache,target=/var/cache/apt,sharing=locked \
 	--mount=type=cache,target=/var/lib/apt,sharing=locked \
@@ -17,7 +15,7 @@ RUN --mount=type=cache,target=/var/cache/apt,sharing=locked \
 WORKDIR /misskey
 
 COPY --link pnpm-lock.yaml ./
-RUN npm install -g pnpm
+RUN npm install -g pnpm@9
 RUN --mount=type=cache,target=/root/.local/share/pnpm/store,sharing=locked \
 	pnpm fetch --ignore-scripts
 
@@ -30,7 +28,7 @@ COPY --link ["packages/misskey-js/package.json", "./packages/misskey-js/"]
 COPY --link ["packages/misskey-reversi/package.json", "./packages/misskey-reversi/"]
 COPY --link ["packages/misskey-bubble-game/package.json", "./packages/misskey-bubble-game/"]
 
-RUN pnpm i --frozen-lockfile --aggregate-output --offline \
+RUN pnpm i --frozen-lockfile --aggregate-output --prefer-offline \
 	&& pnpm rebuild -r
 
 COPY --link . ./
@@ -39,7 +37,7 @@ RUN NODE_ENV=production pnpm build
 
 # build native dependencies for target platform
 
-FROM --platform=$TARGETPLATFORM node:${NODE_VERSION} AS target-builder
+FROM --platform=$TARGETPLATFORM node:22 AS target-builder
 
 RUN apt-get update \
 	&& apt-get install -yqq --no-install-recommends \
@@ -48,7 +46,7 @@ RUN apt-get update \
 WORKDIR /misskey
 
 COPY --link pnpm-lock.yaml ./
-RUN npm install -g pnpm
+RUN npm install -g pnpm@9
 RUN --mount=type=cache,target=/root/.local/share/pnpm/store,sharing=locked \
 	pnpm fetch --ignore-scripts
 
@@ -59,10 +57,10 @@ COPY --link ["packages/misskey-js/package.json", "./packages/misskey-js/"]
 COPY --link ["packages/misskey-reversi/package.json", "./packages/misskey-reversi/"]
 COPY --link ["packages/misskey-bubble-game/package.json", "./packages/misskey-bubble-game/"]
 
-RUN pnpm i --frozen-lockfile --aggregate-output --offline \
+RUN pnpm i --frozen-lockfile --aggregate-output --prefer-offline \
 	&& pnpm rebuild -r
 
-FROM --platform=$TARGETPLATFORM node:${NODE_VERSION}-slim AS runner
+FROM --platform=$TARGETPLATFORM node:22-slim AS runner
 
 ARG UID="991"
 ARG GID="991"
@@ -81,7 +79,7 @@ RUN apt-get update \
 WORKDIR /misskey
 
 COPY --chown=misskey:misskey pnpm-lock.yaml ./
-RUN npm install -g pnpm
+RUN npm install -g pnpm@9
 
 COPY --chown=misskey:misskey --from=target-builder /misskey/node_modules ./node_modules
 COPY --chown=misskey:misskey --from=target-builder /misskey/packages/backend/node_modules ./packages/backend/node_modules