diff --git a/.github/workflows/api-misskey-js.yml b/.github/workflows/api-misskey-js.yml
index fdd128be33..0cad8b045f 100644
--- a/.github/workflows/api-misskey-js.yml
+++ b/.github/workflows/api-misskey-js.yml
@@ -9,10 +9,6 @@ on:
     paths:
       - packages/misskey-js/**
       - .github/workflows/api-misskey-js.yml
-
-env:
-  COREPACK_DEFAULT_TO_LATEST: 0
-
 jobs:
   report:
 
diff --git a/.github/workflows/get-api-diff.yml b/.github/workflows/get-api-diff.yml
index 2da9647460..63396bd8f7 100644
--- a/.github/workflows/get-api-diff.yml
+++ b/.github/workflows/get-api-diff.yml
@@ -9,10 +9,6 @@ on:
     paths:
       - packages/backend/**
       - .github/workflows/get-api-diff.yml
-
-env:
-  COREPACK_DEFAULT_TO_LATEST: 0
-
 jobs:
   get-from-misskey:
     runs-on: ubuntu-latest
diff --git a/.github/workflows/lint.yml b/.github/workflows/lint.yml
index b1d52e8b3b..5a93a79527 100644
--- a/.github/workflows/lint.yml
+++ b/.github/workflows/lint.yml
@@ -28,10 +28,6 @@ on:
       - packages/misskey-reversi/**
       - packages/shared/eslint.config.js
       - .github/workflows/lint.yml
-
-env:
-  COREPACK_DEFAULT_TO_LATEST: 0
-
 jobs:
   pnpm_install:
     runs-on: ubuntu-latest
diff --git a/.github/workflows/locale.yml b/.github/workflows/locale.yml
index 2daeaa3bd7..64412b5ea6 100644
--- a/.github/workflows/locale.yml
+++ b/.github/workflows/locale.yml
@@ -9,10 +9,6 @@ on:
     paths:
       - locales/**
       - .github/workflows/locale.yml
-
-env:
-  COREPACK_DEFAULT_TO_LATEST: 0
-
 jobs:
   locale_verify:
     runs-on: ubuntu-latest
diff --git a/.github/workflows/on-release-created.yml b/.github/workflows/on-release-created.yml
index 8e4ad4368b..e62f77ae6a 100644
--- a/.github/workflows/on-release-created.yml
+++ b/.github/workflows/on-release-created.yml
@@ -6,9 +6,6 @@ on:
 
   workflow_dispatch:
 
-env:
-  COREPACK_DEFAULT_TO_LATEST: 0
-
 jobs:
   publish-misskey-js:
     name: Publish misskey-js
diff --git a/.github/workflows/storybook.yml b/.github/workflows/storybook.yml
index 9e5a79faac..413d5b6406 100644
--- a/.github/workflows/storybook.yml
+++ b/.github/workflows/storybook.yml
@@ -13,9 +13,6 @@ on:
       # This is a waste of chromatic build quota, so we don't run storybook CI on pull requests targets master.
       - master
 
-env:
-  COREPACK_DEFAULT_TO_LATEST: 0
-
 jobs:
   build:
     # chromatic is not likely to be available for fork repositories, so we disable for fork repositories.
diff --git a/.github/workflows/test-backend.yml b/.github/workflows/test-backend.yml
index 2b8092cf45..0b57fd583e 100644
--- a/.github/workflows/test-backend.yml
+++ b/.github/workflows/test-backend.yml
@@ -18,10 +18,6 @@ on:
       - packages/misskey-js/**
       - .github/workflows/test-backend.yml
       - .github/misskey/test.yml
-
-env:
-  COREPACK_DEFAULT_TO_LATEST: 0
-
 jobs:
   unit:
     name: Unit tests (backend)
diff --git a/.github/workflows/test-federation.yml b/.github/workflows/test-federation.yml
index 0b71325de3..f3dbbaf8fa 100644
--- a/.github/workflows/test-federation.yml
+++ b/.github/workflows/test-federation.yml
@@ -15,9 +15,6 @@ on:
       - packages/misskey-js/**
       - .github/workflows/test-federation.yml
 
-env:
-  COREPACK_DEFAULT_TO_LATEST: 0
-
 jobs:
   test:
     name: Federation test
diff --git a/.github/workflows/test-frontend.yml b/.github/workflows/test-frontend.yml
index e489ebf07c..4e392af43b 100644
--- a/.github/workflows/test-frontend.yml
+++ b/.github/workflows/test-frontend.yml
@@ -22,10 +22,6 @@ on:
       - packages/backend/**
       - .github/workflows/test-frontend.yml
       - .github/misskey/test.yml
-
-env:
-  COREPACK_DEFAULT_TO_LATEST: 0
-
 jobs:
   vitest:
     name: Unit tests (frontend)
diff --git a/.github/workflows/test-misskey-js.yml b/.github/workflows/test-misskey-js.yml
index 05f757acc1..19a112566d 100644
--- a/.github/workflows/test-misskey-js.yml
+++ b/.github/workflows/test-misskey-js.yml
@@ -14,10 +14,6 @@ on:
     paths:
       - packages/misskey-js/**
       - .github/workflows/test-misskey-js.yml
-
-env:
-  COREPACK_DEFAULT_TO_LATEST: 0
-
 jobs:
   test:
     name: Unit tests (misskey.js)
diff --git a/.github/workflows/test-production.yml b/.github/workflows/test-production.yml
index 56e42213ff..c0d87195d7 100644
--- a/.github/workflows/test-production.yml
+++ b/.github/workflows/test-production.yml
@@ -9,7 +9,6 @@ on:
 
 env:
   NODE_ENV: production
-  COREPACK_DEFAULT_TO_LATEST: 0
 
 jobs:
   production:
diff --git a/.github/workflows/validate-api-json.yml b/.github/workflows/validate-api-json.yml
index a8b2402988..7ea27eaa90 100644
--- a/.github/workflows/validate-api-json.yml
+++ b/.github/workflows/validate-api-json.yml
@@ -12,10 +12,6 @@ on:
     paths:
       - packages/backend/**
       - .github/workflows/validate-api-json.yml
-
-env:
-  COREPACK_DEFAULT_TO_LATEST: 0
-
 jobs:
   validate-api-json:
     runs-on: ubuntu-latest
diff --git a/CHANGELOG.md b/CHANGELOG.md
index a47b51c3b8..9053d0e803 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -55,8 +55,7 @@
 ## 2025.2.0
 
 ### General
-- Fix: Docker のビルドに失敗する問題を修正  
-  (Cherry-picked from https://activitypub.software/TransFem-org/Sharkey/-/merge_requests/883)
+-
 
 ### Client
 - Fix: パスキーでパスワードレスログインが出来ない問題を修正
diff --git a/Dockerfile b/Dockerfile
index 3bc2044396..13f6909462 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -6,8 +6,6 @@ ARG NODE_VERSION=22.11.0-bookworm
 
 FROM --platform=$BUILDPLATFORM node:${NODE_VERSION} AS native-builder
 
-ENV COREPACK_DEFAULT_TO_LATEST=0
-
 RUN --mount=type=cache,target=/var/cache/apt,sharing=locked \
 	--mount=type=cache,target=/var/lib/apt,sharing=locked \
 	rm -f /etc/apt/apt.conf.d/docker-clean \
@@ -46,8 +44,6 @@ RUN rm -rf .git/
 
 FROM --platform=$TARGETPLATFORM node:${NODE_VERSION} AS target-builder
 
-ENV COREPACK_DEFAULT_TO_LATEST=0
-
 RUN apt-get update \
 	&& apt-get install -yqq --no-install-recommends \
 	build-essential
@@ -72,7 +68,6 @@ FROM --platform=$TARGETPLATFORM node:${NODE_VERSION}-slim AS runner
 
 ARG UID="991"
 ARG GID="991"
-ENV COREPACK_DEFAULT_TO_LATEST=0
 
 RUN apt-get update \
 	&& apt-get install -y --no-install-recommends \
diff --git a/packages/backend/test-federation/compose.tpl.yml b/packages/backend/test-federation/compose.tpl.yml
index 8b270e58f7..8c38f16919 100644
--- a/packages/backend/test-federation/compose.tpl.yml
+++ b/packages/backend/test-federation/compose.tpl.yml
@@ -17,7 +17,6 @@ services:
       - ./.config/docker.env
     environment:
       - NODE_ENV=production
-      - COREPACK_DEFAULT_TO_LATEST=0
     volumes:
       - type: bind
         source: ../../../built
diff --git a/packages/backend/test-federation/compose.yml b/packages/backend/test-federation/compose.yml
index ed39109aab..6f217883ce 100644
--- a/packages/backend/test-federation/compose.yml
+++ b/packages/backend/test-federation/compose.yml
@@ -29,7 +29,6 @@ services:
     environment:
       - NODE_ENV=development
       - NODE_EXTRA_CA_CERTS=/usr/local/share/ca-certificates/rootCA.crt
-      - COREPACK_DEFAULT_TO_LATEST=0
     volumes:
       - type: bind
         source: ../package.json
@@ -90,8 +89,6 @@ services:
     depends_on:
       redis.test:
         condition: service_healthy
-    environment:
-      - COREPACK_DEFAULT_TO_LATEST=0
     volumes:
       - type: bind
         source: ../package.json