diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 890e6b2d..814c73a1 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -45,7 +45,7 @@ jobs:
     - name: setup node.js
       uses: actions/setup-node@master
       with:
-        node-version: 20.x
+        node-version: 18.x
 
     - name: setup pnpm
       uses: pnpm/action-setup@v2
diff --git a/backend/Dockerfile b/backend/Dockerfile
index bfaa842f..c5b27131 100644
--- a/backend/Dockerfile
+++ b/backend/Dockerfile
@@ -1,4 +1,4 @@
-FROM node:20-alpine
+FROM node:18-alpine
 # https://github.com/pnpm/pnpm/issues/4495#issuecomment-1317831712
 ENV PNPM_HOME="/root/.local/share/pnpm"
 ENV PATH="${PATH}:${PNPM_HOME}"
diff --git a/backend/package.json b/backend/package.json
index 8eb248f3..743df35d 100644
--- a/backend/package.json
+++ b/backend/package.json
@@ -7,7 +7,7 @@
   "author": "jolim, chanykim, tkim, jimin, wocho, seongyle, seunam",
   "license": "MIT",
   "engines": {
-    "node": ">=20.0.0"
+    "node": ">=20.3.1 || >=18.16.1 <20.0.0"
   },
   "scripts": {
     "start": "node dist/server.js",
@@ -26,7 +26,7 @@
     "@types/jest": "^29.5.2",
     "@types/jsonwebtoken": "^9.0.2",
     "@types/morgan": "^1.9.4",
-    "@types/node": "^20.3.1",
+    "@types/node": "^18.16.1",
     "@types/node-schedule": "^2.1.0",
     "@types/passport": "^1.0.12",
     "@types/passport-jwt": "^3.0.8",
diff --git a/backend/pnpm-lock.yaml b/backend/pnpm-lock.yaml
index 877459ea..1e57c05d 100644
--- a/backend/pnpm-lock.yaml
+++ b/backend/pnpm-lock.yaml
@@ -1,4 +1,4 @@
-lockfileVersion: '6.1'
+lockfileVersion: '6.0'
 
 settings:
   autoInstallPeers: true
@@ -125,8 +125,8 @@ devDependencies:
     specifier: ^1.9.4
     version: 1.9.4
   '@types/node':
-    specifier: ^20.3.1
-    version: 20.3.1
+    specifier: ^18.16.1
+    version: 18.16.1
   '@types/node-schedule':
     specifier: ^2.1.0
     version: 2.1.0
@@ -159,7 +159,7 @@ devDependencies:
     version: 2.27.5(@typescript-eslint/parser@5.60.0)(eslint@8.43.0)
   jest:
     specifier: ^29.5.0
-    version: 29.5.0(@types/node@20.3.1)(ts-node@10.9.1)
+    version: 29.5.0(@types/node@18.16.1)(ts-node@10.9.1)
   nodemon:
     specifier: ^2.0.22
     version: 2.0.22
@@ -171,7 +171,7 @@ devDependencies:
     version: 29.1.0(@babel/core@7.22.5)(jest@29.5.0)(typescript@5.0.4)
   ts-node:
     specifier: ^10.9.1
-    version: 10.9.1(@types/node@20.3.1)(typescript@5.0.4)
+    version: 10.9.1(@types/node@18.16.1)(typescript@5.0.4)
   typescript:
     specifier: 5.0.4
     version: 5.0.4
@@ -659,7 +659,7 @@ packages:
     engines: {node: ^14.15.0 || ^16.10.0 || >=18.0.0}
     dependencies:
       '@jest/types': 29.5.0
-      '@types/node': 20.3.1
+      '@types/node': 18.16.1
       chalk: 4.1.2
       jest-message-util: 29.5.0
       jest-util: 29.5.0
@@ -679,14 +679,14 @@ packages:
       '@jest/test-result': 29.5.0
       '@jest/transform': 29.5.0
       '@jest/types': 29.5.0
-      '@types/node': 20.3.1
+      '@types/node': 18.16.1
       ansi-escapes: 4.3.2
       chalk: 4.1.2
       ci-info: 3.8.0
       exit: 0.1.2
       graceful-fs: 4.2.11
       jest-changed-files: 29.5.0
-      jest-config: 29.5.0(@types/node@20.3.1)(ts-node@10.9.1)
+      jest-config: 29.5.0(@types/node@18.16.1)(ts-node@10.9.1)
       jest-haste-map: 29.5.0
       jest-message-util: 29.5.0
       jest-regex-util: 29.4.3
@@ -712,7 +712,7 @@ packages:
     dependencies:
       '@jest/fake-timers': 29.5.0
       '@jest/types': 29.5.0
-      '@types/node': 20.3.1
+      '@types/node': 18.16.1
       jest-mock: 29.5.0
 
   /@jest/expect-utils@29.5.0:
@@ -736,7 +736,7 @@ packages:
     dependencies:
       '@jest/types': 29.5.0
       '@sinonjs/fake-timers': 10.3.0
-      '@types/node': 20.3.1
+      '@types/node': 18.16.1
       jest-message-util: 29.5.0
       jest-mock: 29.5.0
       jest-util: 29.5.0
@@ -767,7 +767,7 @@ packages:
       '@jest/transform': 29.5.0
       '@jest/types': 29.5.0
       '@jridgewell/trace-mapping': 0.3.18
-      '@types/node': 20.3.1
+      '@types/node': 18.16.1
       chalk: 4.1.2
       collect-v8-coverage: 1.0.1
       exit: 0.1.2
@@ -849,7 +849,7 @@ packages:
       '@jest/schemas': 29.4.3
       '@types/istanbul-lib-coverage': 2.0.4
       '@types/istanbul-reports': 3.0.1
-      '@types/node': 20.3.1
+      '@types/node': 18.16.1
       '@types/yargs': 17.0.24
       chalk: 4.1.2
 
@@ -969,7 +969,7 @@ packages:
     resolution: {integrity: sha512-DTuBFbqu4gGfajREEMrkq5jBhcnskinhr4+AnfJEk48zhVeEv3XnUKGIX98B74kxhYsIMfApGGySTn7V3b5yBA==}
     engines: {node: '>= 12.13.0', npm: '>= 6.12.0'}
     dependencies:
-      '@types/node': 20.3.1
+      '@types/node': 18.16.1
     dev: false
 
   /@slack/types@2.8.0:
@@ -984,7 +984,7 @@ packages:
       '@slack/logger': 3.0.0
       '@slack/types': 2.8.0
       '@types/is-stream': 1.1.0
-      '@types/node': 20.3.1
+      '@types/node': 18.16.1
       axios: 0.26.1
       eventemitter3: 3.1.2
       form-data: 2.5.1
@@ -1046,20 +1046,20 @@ packages:
   /@types/bcrypt@5.0.0:
     resolution: {integrity: sha512-agtcFKaruL8TmcvqbndlqHPSJgsolhf/qPWchFlgnW1gECTN/nKbFcoFnvKAQRFfKbh+BO6A3SWdJu9t+xF3Lw==}
     dependencies:
-      '@types/node': 20.3.1
+      '@types/node': 18.16.1
     dev: true
 
   /@types/body-parser@1.19.2:
     resolution: {integrity: sha512-ALYone6pm6QmwZoAgeyNksccT9Q4AWZQ6PvfwR37GT6r6FWUPguq6sUmNGSMV2Wr761oQoBxwGGa6DR5o1DC9g==}
     dependencies:
       '@types/connect': 3.4.35
-      '@types/node': 20.3.1
+      '@types/node': 18.16.1
     dev: true
 
   /@types/connect@3.4.35:
     resolution: {integrity: sha512-cdeYyv4KWoEgpBISTxWvqYsVy444DOqehiF3fM3ne10AmJ62RSyNkUnxMJXHQWRQQX2eR94m5y1IZyDwBjV9FQ==}
     dependencies:
-      '@types/node': 20.3.1
+      '@types/node': 18.16.1
     dev: true
 
   /@types/cookie-parser@1.4.3:
@@ -1071,13 +1071,13 @@ packages:
   /@types/cors@2.8.13:
     resolution: {integrity: sha512-RG8AStHlUiV5ysZQKq97copd2UmVYw3/pRMLefISZ3S1hK104Cwm7iLQ3fTKx+lsUH2CE8FlLaYeEA2LSeqYUA==}
     dependencies:
-      '@types/node': 20.3.1
+      '@types/node': 18.16.1
     dev: true
 
   /@types/express-serve-static-core@4.17.35:
     resolution: {integrity: sha512-wALWQwrgiB2AWTT91CB62b6Yt0sNHpznUXeZEcnPU3DRdlDIz74x8Qg1UUYKSVFi+va5vKOLYRBI1bRKiLLKIg==}
     dependencies:
-      '@types/node': 20.3.1
+      '@types/node': 18.16.1
       '@types/qs': 6.9.7
       '@types/range-parser': 1.2.4
       '@types/send': 0.17.1
@@ -1095,7 +1095,7 @@ packages:
   /@types/graceful-fs@4.1.6:
     resolution: {integrity: sha512-Sig0SNORX9fdW+bQuTEovKj3uHcUL6LQKbCrrqb1X7J6/ReAbhCXRAhc+SMejhLELFj2QcyuxmUooZ4bt5ReSw==}
     dependencies:
-      '@types/node': 20.3.1
+      '@types/node': 18.16.1
 
   /@types/http-errors@2.0.1:
     resolution: {integrity: sha512-/K3ds8TRAfBvi5vfjuz8y6+GiAYBZ0x4tXv1Av6CWBWn0IlADc+ZX9pMq7oU0fNQPnBwIZl3rmeLp6SBApbxSQ==}
@@ -1104,7 +1104,7 @@ packages:
   /@types/is-stream@1.1.0:
     resolution: {integrity: sha512-jkZatu4QVbR60mpIzjINmtS1ZF4a/FqdTUTBeQDVOQ2PYyidtwFKr0B5G6ERukKwliq+7mIXvxyppwzG5EgRYg==}
     dependencies:
-      '@types/node': 20.3.1
+      '@types/node': 18.16.1
     dev: false
 
   /@types/istanbul-lib-coverage@2.0.4:
@@ -1137,7 +1137,7 @@ packages:
   /@types/jsonwebtoken@9.0.2:
     resolution: {integrity: sha512-drE6uz7QBKq1fYqqoFKTDRdFCPHd5TCub75BM+D+cMx7NU9hUz7SESLfC2fSCXVFMO5Yj8sOWHuGqPgjc+fz0Q==}
     dependencies:
-      '@types/node': 20.3.1
+      '@types/node': 18.16.1
     dev: true
 
   /@types/mime@1.3.2:
@@ -1151,21 +1151,21 @@ packages:
   /@types/morgan@1.9.4:
     resolution: {integrity: sha512-cXoc4k+6+YAllH3ZHmx4hf7La1dzUk6keTR4bF4b4Sc0mZxU/zK4wO7l+ZzezXm/jkYj/qC+uYGZrarZdIVvyQ==}
     dependencies:
-      '@types/node': 20.3.1
+      '@types/node': 18.16.1
     dev: true
 
   /@types/node-schedule@2.1.0:
     resolution: {integrity: sha512-NiTwl8YN3v/1YCKrDFSmCTkVxFDylueEqsOFdgF+vPsm+AlyJKGAo5yzX1FiOxPsZiN6/r8gJitYx2EaSuBmmg==}
     dependencies:
-      '@types/node': 20.3.1
+      '@types/node': 18.16.1
     dev: true
 
   /@types/node@12.20.55:
     resolution: {integrity: sha512-J8xLz7q2OFulZ2cyGTLE1TbbZcjpno7FaN6zdJNrgAdrJ+DZzh/uFR6YrTb4C+nXakvud8Q4+rbhoIWlYQbUFQ==}
     dev: false
 
-  /@types/node@20.3.1:
-    resolution: {integrity: sha512-EhcH/wvidPy1WeML3TtYFGR83UzjxeWRen9V402T8aUGYsCHOmfoisV3ZSg03gAFIbLq8TnWOJ0f4cALtnSEUg==}
+  /@types/node@18.16.1:
+    resolution: {integrity: sha512-DZxSZWXxFfOlx7k7Rv4LAyiMroaxa3Ly/7OOzZO8cBNho0YzAi4qlbrx8W27JGqG57IgR/6J7r+nOJWw6kcvZA==}
 
   /@types/passport-jwt@3.0.8:
     resolution: {integrity: sha512-VKJZDJUAHFhPHHYvxdqFcc5vlDht8Q2pL1/ePvKAgqRThDaCc84lSYOTQmnx3+JIkDlN+2KfhFhXIzlcVT+Pcw==}
@@ -1202,7 +1202,7 @@ packages:
   /@types/readable-stream@2.3.15:
     resolution: {integrity: sha512-oM5JSKQCcICF1wvGgmecmHldZ48OZamtMxcGGVICOJA8o8cahXC1zEVAif8iwoc5j8etxFaRFnf095+CDsuoFQ==}
     dependencies:
-      '@types/node': 20.3.1
+      '@types/node': 18.16.1
       safe-buffer: 5.1.2
     dev: false
 
@@ -1218,14 +1218,14 @@ packages:
     resolution: {integrity: sha512-Cwo8LE/0rnvX7kIIa3QHCkcuF21c05Ayb0ZfxPiv0W8VRiZiNW/WuRupHKpqqGVGf7SUA44QSOUKaEd9lIrd/Q==}
     dependencies:
       '@types/mime': 1.3.2
-      '@types/node': 20.3.1
+      '@types/node': 18.16.1
     dev: true
 
   /@types/serve-static@1.15.1:
     resolution: {integrity: sha512-NUo5XNiAdULrJENtJXZZ3fHtfMolzZwczzBbnAeBbqBwG+LaG6YaJtuwzwGSQZ2wsCrxjEhNNjAkKigy3n8teQ==}
     dependencies:
       '@types/mime': 3.0.1
-      '@types/node': 20.3.1
+      '@types/node': 18.16.1
     dev: true
 
   /@types/stack-utils@2.0.1:
@@ -3606,7 +3606,7 @@ packages:
       '@jest/expect': 29.5.0
       '@jest/test-result': 29.5.0
       '@jest/types': 29.5.0
-      '@types/node': 20.3.1
+      '@types/node': 18.16.1
       chalk: 4.1.2
       co: 4.6.0
       dedent: 0.7.0
@@ -3625,7 +3625,7 @@ packages:
     transitivePeerDependencies:
       - supports-color
 
-  /jest-cli@29.5.0(@types/node@20.3.1)(ts-node@10.9.1):
+  /jest-cli@29.5.0(@types/node@18.16.1)(ts-node@10.9.1):
     resolution: {integrity: sha512-L1KcP1l4HtfwdxXNFCL5bmUbLQiKrakMUriBEcc1Vfz6gx31ORKdreuWvmQVBit+1ss9NNR3yxjwfwzZNdQXJw==}
     engines: {node: ^14.15.0 || ^16.10.0 || >=18.0.0}
     hasBin: true
@@ -3642,7 +3642,7 @@ packages:
       exit: 0.1.2
       graceful-fs: 4.2.11
       import-local: 3.1.0
-      jest-config: 29.5.0(@types/node@20.3.1)(ts-node@10.9.1)
+      jest-config: 29.5.0(@types/node@18.16.1)(ts-node@10.9.1)
       jest-util: 29.5.0
       jest-validate: 29.5.0
       prompts: 2.4.2
@@ -3652,7 +3652,7 @@ packages:
       - supports-color
       - ts-node
 
-  /jest-config@29.5.0(@types/node@20.3.1)(ts-node@10.9.1):
+  /jest-config@29.5.0(@types/node@18.16.1)(ts-node@10.9.1):
     resolution: {integrity: sha512-kvDUKBnNJPNBmFFOhDbm59iu1Fii1Q6SxyhXfvylq3UTHbg6o7j/g8k2dZyXWLvfdKB1vAPxNZnMgtKJcmu3kA==}
     engines: {node: ^14.15.0 || ^16.10.0 || >=18.0.0}
     peerDependencies:
@@ -3667,7 +3667,7 @@ packages:
       '@babel/core': 7.22.5
       '@jest/test-sequencer': 29.5.0
       '@jest/types': 29.5.0
-      '@types/node': 20.3.1
+      '@types/node': 18.16.1
       babel-jest: 29.5.0(@babel/core@7.22.5)
       chalk: 4.1.2
       ci-info: 3.8.0
@@ -3687,7 +3687,7 @@ packages:
       pretty-format: 29.5.0
       slash: 3.0.0
       strip-json-comments: 3.1.1
-      ts-node: 10.9.1(@types/node@20.3.1)(typescript@5.0.4)
+      ts-node: 10.9.1(@types/node@18.16.1)(typescript@5.0.4)
     transitivePeerDependencies:
       - supports-color
 
@@ -3723,7 +3723,7 @@ packages:
       '@jest/environment': 29.5.0
       '@jest/fake-timers': 29.5.0
       '@jest/types': 29.5.0
-      '@types/node': 20.3.1
+      '@types/node': 18.16.1
       jest-mock: 29.5.0
       jest-util: 29.5.0
 
@@ -3737,7 +3737,7 @@ packages:
     dependencies:
       '@jest/types': 29.5.0
       '@types/graceful-fs': 4.1.6
-      '@types/node': 20.3.1
+      '@types/node': 18.16.1
       anymatch: 3.1.3
       fb-watchman: 2.0.2
       graceful-fs: 4.2.11
@@ -3785,7 +3785,7 @@ packages:
       jest: ^24.0.0 || ^25.0.0 || ^26.0.0 || ^27.0.0 || ^28.0.0 || ^29.0.0
       typescript: ^3.0.0 || ^4.0.0 || ^5.0.0
     dependencies:
-      jest: 29.5.0(@types/node@20.3.1)(ts-node@10.9.1)
+      jest: 29.5.0(@types/node@18.16.1)(ts-node@10.9.1)
       ts-essentials: 7.0.3(typescript@5.0.4)
       typescript: 5.0.4
     dev: false
@@ -3795,7 +3795,7 @@ packages:
     engines: {node: ^14.15.0 || ^16.10.0 || >=18.0.0}
     dependencies:
       '@jest/types': 29.5.0
-      '@types/node': 20.3.1
+      '@types/node': 18.16.1
       jest-util: 29.5.0
 
   /jest-pnp-resolver@1.2.3(jest-resolve@29.5.0):
@@ -3845,7 +3845,7 @@ packages:
       '@jest/test-result': 29.5.0
       '@jest/transform': 29.5.0
       '@jest/types': 29.5.0
-      '@types/node': 20.3.1
+      '@types/node': 18.16.1
       chalk: 4.1.2
       emittery: 0.13.1
       graceful-fs: 4.2.11
@@ -3875,7 +3875,7 @@ packages:
       '@jest/test-result': 29.5.0
       '@jest/transform': 29.5.0
       '@jest/types': 29.5.0
-      '@types/node': 20.3.1
+      '@types/node': 18.16.1
       chalk: 4.1.2
       cjs-module-lexer: 1.2.3
       collect-v8-coverage: 1.0.1
@@ -3928,7 +3928,7 @@ packages:
     engines: {node: ^14.15.0 || ^16.10.0 || >=18.0.0}
     dependencies:
       '@jest/types': 29.5.0
-      '@types/node': 20.3.1
+      '@types/node': 18.16.1
       chalk: 4.1.2
       ci-info: 3.8.0
       graceful-fs: 4.2.11
@@ -3951,7 +3951,7 @@ packages:
     dependencies:
       '@jest/test-result': 29.5.0
       '@jest/types': 29.5.0
-      '@types/node': 20.3.1
+      '@types/node': 18.16.1
       ansi-escapes: 4.3.2
       chalk: 4.1.2
       emittery: 0.13.1
@@ -3962,12 +3962,12 @@ packages:
     resolution: {integrity: sha512-NcrQnevGoSp4b5kg+akIpthoAFHxPBcb5P6mYPY0fUNT+sSvmtu6jlkEle3anczUKIKEbMxFimk9oTP/tpIPgA==}
     engines: {node: ^14.15.0 || ^16.10.0 || >=18.0.0}
     dependencies:
-      '@types/node': 20.3.1
+      '@types/node': 18.16.1
       jest-util: 29.5.0
       merge-stream: 2.0.0
       supports-color: 8.1.1
 
-  /jest@29.5.0(@types/node@20.3.1)(ts-node@10.9.1):
+  /jest@29.5.0(@types/node@18.16.1)(ts-node@10.9.1):
     resolution: {integrity: sha512-juMg3he2uru1QoXX078zTa7pO85QyB9xajZc6bU+d9yEGwrKX6+vGmJQ3UdVZsvTEUARIdObzH68QItim6OSSQ==}
     engines: {node: ^14.15.0 || ^16.10.0 || >=18.0.0}
     hasBin: true
@@ -3980,7 +3980,7 @@ packages:
       '@jest/core': 29.5.0(ts-node@10.9.1)
       '@jest/types': 29.5.0
       import-local: 3.1.0
-      jest-cli: 29.5.0(@types/node@20.3.1)(ts-node@10.9.1)
+      jest-cli: 29.5.0(@types/node@18.16.1)(ts-node@10.9.1)
     transitivePeerDependencies:
       - '@types/node'
       - supports-color
@@ -5780,7 +5780,7 @@ packages:
       '@babel/core': 7.22.5
       bs-logger: 0.2.6
       fast-json-stable-stringify: 2.1.0
-      jest: 29.5.0(@types/node@20.3.1)(ts-node@10.9.1)
+      jest: 29.5.0(@types/node@18.16.1)(ts-node@10.9.1)
       jest-util: 29.5.0
       json5: 2.2.3
       lodash.memoize: 4.1.2
@@ -5790,7 +5790,7 @@ packages:
       yargs-parser: 21.1.1
     dev: true
 
-  /ts-node@10.9.1(@types/node@20.3.1)(typescript@5.0.4):
+  /ts-node@10.9.1(@types/node@18.16.1)(typescript@5.0.4):
     resolution: {integrity: sha512-NtVysVPkxxrwFGUUxGYhfux8k78pQB3JqYBXlLRZgdGUqTO5wU/UyHop5p70iEbGhB7q5KmiZiU0Y3KlJrScEw==}
     hasBin: true
     peerDependencies:
@@ -5809,7 +5809,7 @@ packages:
       '@tsconfig/node12': 1.0.11
       '@tsconfig/node14': 1.0.3
       '@tsconfig/node16': 1.0.4
-      '@types/node': 20.3.1
+      '@types/node': 18.16.1
       acorn: 8.9.0
       acorn-walk: 8.2.0
       arg: 4.1.3
@@ -6088,7 +6088,7 @@ packages:
       pg: 8.11.0
       reflect-metadata: 0.1.13
       sha.js: 2.4.11
-      ts-node: 10.9.1(@types/node@20.3.1)(typescript@5.0.4)
+      ts-node: 10.9.1(@types/node@18.16.1)(typescript@5.0.4)
       tslib: 2.5.2
       uuid: 8.3.2
       xml2js: 0.4.23
diff --git a/migration/Dockerfile b/migration/Dockerfile
index a3eeb86c..6aae6800 100644
--- a/migration/Dockerfile
+++ b/migration/Dockerfile
@@ -1,4 +1,4 @@
-FROM node:20-alpine
+FROM node:18-alpine
 ENV PNPM_HOME="/root/.local/share/pnpm"
 ENV PATH="${PATH}:${PNPM_HOME}"
 RUN npm install --global pnpm