diff --git a/.devcontainer/devcontainer.json b/.devcontainer/devcontainer.json
index 0664ecd11..89df1b5d0 100644
--- a/.devcontainer/devcontainer.json
+++ b/.devcontainer/devcontainer.json
@@ -6,7 +6,7 @@
 	"features": {
 		"ghcr.io/devcontainers-contrib/features/pnpm:2": {},
 		"ghcr.io/devcontainers/features/node:1": {
-			"version": "20.3.1"
+			"version": "18.17.0"
 		}
 	},
 	"forwardPorts": [3000],
diff --git a/.github/ISSUE_TEMPLATE/01_bug-report.md b/.github/ISSUE_TEMPLATE/01_bug-report.md
index b889d96eb..25e7fc8b2 100644
--- a/.github/ISSUE_TEMPLATE/01_bug-report.md
+++ b/.github/ISSUE_TEMPLATE/01_bug-report.md
@@ -54,7 +54,7 @@ Please include errors from the developer console and/or server log files if you
 
 * Installation Method or Hosting Service: <!-- Example: docker compose, k8s/docker, systemd, "Misskey install shell script", development environment -->
 * Misskey: 13.x.x
-* Node: 20.x.x
+* Node: 18.x.x
 * PostgreSQL: 15.x.x
 * Redis: 7.x.x
 * OS and Architecture: <!-- Example: Ubuntu 22.04.2 LTS aarch64 -->
diff --git a/.github/workflows/test-backend.yml b/.github/workflows/test-backend.yml
index 96e64c322..d7be15bd4 100644
--- a/.github/workflows/test-backend.yml
+++ b/.github/workflows/test-backend.yml
@@ -13,7 +13,7 @@ jobs:
 
     strategy:
       matrix:
-        node-version: [20.x]
+        node-version: [18.x]
 
     services:
       postgres:
diff --git a/.github/workflows/test-frontend.yml b/.github/workflows/test-frontend.yml
index eef68aa0d..4ea4ba462 100644
--- a/.github/workflows/test-frontend.yml
+++ b/.github/workflows/test-frontend.yml
@@ -13,7 +13,7 @@ jobs:
 
     strategy:
       matrix:
-        node-version: [20.x]
+        node-version: [18.x]
 
     steps:
     - uses: actions/checkout@v3.3.0
@@ -51,7 +51,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        node-version: [20.x]
+        node-version: [18.x]
         browser: [chrome]
 
     services:
diff --git a/.github/workflows/test-misskey-js.yml b/.github/workflows/test-misskey-js.yml
index 213657ce1..b15e704c7 100644
--- a/.github/workflows/test-misskey-js.yml
+++ b/.github/workflows/test-misskey-js.yml
@@ -16,7 +16,7 @@ jobs:
 
     strategy:
       matrix:
-        node-version: [20.x]
+        node-version: [18.x]
         # See supported Node.js release schedule at https://nodejs.org/en/about/releases/
 
     steps:
diff --git a/.github/workflows/test-production.yml b/.github/workflows/test-production.yml
index 8429465b5..5243a8377 100644
--- a/.github/workflows/test-production.yml
+++ b/.github/workflows/test-production.yml
@@ -16,7 +16,7 @@ jobs:
 
     strategy:
       matrix:
-        node-version: [20.x]
+        node-version: [18.x]
 
     steps:
     - uses: actions/checkout@v3.3.0
diff --git a/.node-version b/.node-version
index dd0fe95cc..603606bc9 100644
--- a/.node-version
+++ b/.node-version
@@ -1 +1 @@
-20.3.1
+18.17.0
diff --git a/Dockerfile b/Dockerfile
index 5431c28aa..e23dc1014 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,6 +1,6 @@
 # syntax = docker/dockerfile:1.4
 
-ARG NODE_VERSION=20.3.1-bullseye
+ARG NODE_VERSION=18.17.0-bullseye
 
 # build assets & compile TypeScript