diff --git a/.nvmrc b/.nvmrc
index 2dbbe00e67..87ec8842b1 100644
--- a/.nvmrc
+++ b/.nvmrc
@@ -1 +1 @@
-20.11.1
+18.18.2
diff --git a/_dev/docker/ci-lockfile-generator/Dockerfile b/_dev/docker/ci-lockfile-generator/Dockerfile
index 1599237f6c..6c04f12868 100644
--- a/_dev/docker/ci-lockfile-generator/Dockerfile
+++ b/_dev/docker/ci-lockfile-generator/Dockerfile
@@ -5,7 +5,7 @@
 # By running a yarn install inside the same base container that we use in our CI, we can
 # ensure the same checksums are created correctly.
 #
-FROM cimg/node:20.11
+FROM cimg/node:18.18
 
 COPY . .
 RUN sudo yarn cache clear --all
diff --git a/_dev/docker/ci/Dockerfile b/_dev/docker/ci/Dockerfile
index 5d82ba7e83..0fe0a02cae 100644
--- a/_dev/docker/ci/Dockerfile
+++ b/_dev/docker/ci/Dockerfile
@@ -4,7 +4,7 @@
 
 # Runs tests and common CI operations. Needs minimal install. Assumes
 # workspace will be restored into the project folder.
-FROM cimg/node:20.11 as test-runner
+FROM cimg/node:18.18 as test-runner
 RUN sudo apt-get update && sudo apt-get install -y \
     python3-venv
 WORKDIR /home/circleci
@@ -38,7 +38,7 @@ RUN npx playwright install firefox;
 
 # Runs functional tests in our CI. Needs minimal install. Assumes
 # workspace will be restored into the project folder.
-FROM cimg/node:20.11-browsers as functional-test-runner
+FROM cimg/node:18.18-browsers as functional-test-runner
 WORKDIR /home/circleci
 COPY --chown=circleci:circleci --from=playwright-install /home/circleci/.cache/ms-playwright .cache/ms-playwright/
 COPY --chown=circleci:circleci project project
diff --git a/_dev/docker/mono/Dockerfile b/_dev/docker/mono/Dockerfile
index 39a93a77d3..04a6958922 100644
--- a/_dev/docker/mono/Dockerfile
+++ b/_dev/docker/mono/Dockerfile
@@ -1,7 +1,7 @@
 # Multi stage docker build for fxa-mono repo. Note that stages should be cached due to docker layer caching being
 # turned on in CI.
 
-FROM node:20.11.1-bullseye-slim AS fxa-base
+FROM node:18.18.2-bullseye-slim AS fxa-base
 RUN set -x \
     && addgroup --gid 10001 app \
     && adduser --disabled-password \
diff --git a/package.json b/package.json
index 7d12683145..077240f1ed 100644
--- a/package.json
+++ b/package.json
@@ -113,7 +113,7 @@
     "winston": "^3.11.0"
   },
   "engines": {
-    "node": "^20.11.1"
+    "node": "^18.18.2"
   },
   "husky": {
     "hooks": {
@@ -174,7 +174,7 @@
     "@types/babel__core": "^7",
     "@types/jest": "^29.5.1",
     "@types/mysql": "^2",
-    "@types/node": "^20.11.1",
+    "@types/node": "^18.18.2",
     "@types/passport": "^1.0.6",
     "@types/passport-http-bearer": "^1.0.36",
     "@types/passport-jwt": "^4",
@@ -230,7 +230,7 @@
     "@graphql-typed-document-node/core": "3.2.0",
     "@nestjs/cli/typescript": "^4.5.2",
     "@svgr/webpack": "^8.0.1",
-    "@types/node": "^20.11.1",
+    "@types/node": "^18.18.2",
     "@types/react": "^18",
     "browserid-crypto": "https://github.com/mozilla-fxa/browserid-crypto.git#5979544d13eeb15a02d0b9a6a7a08a698d54d37d",
     "css-minimizer-webpack-plugin": ">=4 <5",
diff --git a/packages/fxa-admin-server/package.json b/packages/fxa-admin-server/package.json
index 18bb88e0f8..6524951d10 100644
--- a/packages/fxa-admin-server/package.json
+++ b/packages/fxa-admin-server/package.json
@@ -60,7 +60,7 @@
     "@nestjs/cli": "^9.4.0",
     "@types/chance": "^1.1.2",
     "@types/convict": "^6.1.1",
-    "@types/node": "^20.11.1",
+    "@types/node": "^18.18.2",
     "@types/pem-jwk": "^2",
     "@types/supertest": "^2.0.11",
     "@types/yargs": "^17.0.0",
diff --git a/packages/fxa-auth-client/package.json b/packages/fxa-auth-client/package.json
index ea8d97c74a..e3f6c81a3f 100644
--- a/packages/fxa-auth-client/package.json
+++ b/packages/fxa-auth-client/package.json
@@ -55,7 +55,7 @@
     "@types/assert": "^1.5.4",
     "@types/fast-text-encoding": "^1",
     "@types/mocha": "^8",
-    "@types/node": "^20.11.1",
+    "@types/node": "^18.18.2",
     "@types/node-fetch": "^2.5.7",
     "@types/prettier": "^2",
     "asmcrypto.js": "^0.22.0",
diff --git a/packages/fxa-auth-server/package.json b/packages/fxa-auth-server/package.json
index 165a98d85a..2a340213a7 100644
--- a/packages/fxa-auth-server/package.json
+++ b/packages/fxa-auth-server/package.json
@@ -165,7 +165,7 @@
     "@types/memcached": "^2.2.6",
     "@types/mocha": "^8.2.2",
     "@types/nock": "^11.1.0",
-    "@types/node": "^20.11.1",
+    "@types/node": "^18.18.2",
     "@types/node-zendesk": "^2.0.2",
     "@types/nodemailer": "^6.4.2",
     "@types/request": "2.48.5",
diff --git a/packages/fxa-event-broker/package.json b/packages/fxa-event-broker/package.json
index 93e1a46e03..03d6ef854d 100644
--- a/packages/fxa-event-broker/package.json
+++ b/packages/fxa-event-broker/package.json
@@ -59,7 +59,7 @@
     "@types/convict": "^5.2.2",
     "@types/express": "^4.17.12",
     "@types/jest": "^26.0.23",
-    "@types/node": "^20.11.1",
+    "@types/node": "^18.18.2",
     "@types/passport": "^1.0.6",
     "@types/passport-jwt": "^3.0.5",
     "@types/rimraf": "3.0.0",
diff --git a/packages/fxa-graphql-api/package.json b/packages/fxa-graphql-api/package.json
index be0b841510..d6b2da2bbb 100644
--- a/packages/fxa-graphql-api/package.json
+++ b/packages/fxa-graphql-api/package.json
@@ -72,7 +72,7 @@
     "@types/graphql": "^14.5.0",
     "@types/ioredis": "^4.26.4",
     "@types/jest": "^29.2.5",
-    "@types/node": "^20.11.1",
+    "@types/node": "^18.18.2",
     "@types/passport": "^1.0.6",
     "@types/passport-http-bearer": "^1.0.36",
     "@types/superagent": "4.1.11",
diff --git a/packages/fxa-payments-server/package.json b/packages/fxa-payments-server/package.json
index 8696fd41c2..f4f1636220 100644
--- a/packages/fxa-payments-server/package.json
+++ b/packages/fxa-payments-server/package.json
@@ -76,7 +76,7 @@
     "@types/jest": "^26.0.23",
     "@types/jsdom": "^16.2.11",
     "@types/nock": "^11.1.0",
-    "@types/node": "^20.11.1",
+    "@types/node": "^18.18.2",
     "@types/postcss-import": "^12",
     "@types/react-redux": "^7.1.18",
     "@types/react-stripe-elements": "^6.0.6",
diff --git a/packages/fxa-react/package.json b/packages/fxa-react/package.json
index 5f88de177e..94f1e00cc4 100644
--- a/packages/fxa-react/package.json
+++ b/packages/fxa-react/package.json
@@ -66,7 +66,7 @@
     "@types/classnames": "^2.3.1",
     "@types/file-loader": "^5.0.0",
     "@types/jest": "^26.0.23",
-    "@types/node": "^20.11.1",
+    "@types/node": "^18.18.2",
     "@types/postcss-import": "^14",
     "@types/prettier": "2.3.0",
     "@types/react-helmet": "^6.1.6",
diff --git a/packages/fxa-settings/package.json b/packages/fxa-settings/package.json
index aab75ac2ab..d0b5057a9c 100644
--- a/packages/fxa-settings/package.json
+++ b/packages/fxa-settings/package.json
@@ -214,7 +214,7 @@
     "@types/file-saver": "^2.0.5",
     "@types/jest": "^26.0.23",
     "@types/lodash.groupby": "^4",
-    "@types/node": "^20.11.1",
+    "@types/node": "^18.18.2",
     "@types/prop-types": "^15",
     "@types/reach__router": "^1.3.11",
     "@types/react-router": "^5.1.19",
diff --git a/packages/fxa-shared/package.json b/packages/fxa-shared/package.json
index e41f577a62..86386a0d46 100644
--- a/packages/fxa-shared/package.json
+++ b/packages/fxa-shared/package.json
@@ -266,7 +266,7 @@
     "@types/lodash.pick": "^4",
     "@types/mocha": "^8.2.2",
     "@types/mysql": "^2",
-    "@types/node": "^20.11.1",
+    "@types/node": "^18.18.2",
     "@types/proxyquire": "^1.3.28",
     "@types/sinon": "10.0.1",
     "@types/superagent": "^4.1.11",
diff --git a/yarn.lock b/yarn.lock
index be8676ab91..7bc3b3cd95 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -22643,12 +22643,12 @@ __metadata:
   languageName: node
   linkType: hard
 
-"@types/node@npm:^20.11.1":
-  version: 20.11.26
-  resolution: "@types/node@npm:20.11.26"
+"@types/node@npm:^18.18.2":
+  version: 18.18.9
+  resolution: "@types/node@npm:18.18.9"
   dependencies:
     undici-types: ~5.26.4
-  checksum: 2cd5a373d2880b7f07ae65d4d23660cdcabddb12772ce631b6caad2f9283350b8a17c802590f67f0ccec5a9c7d43ae0ecd9637c5ad870b8f793328af8c61eae5
+  checksum: 629ce20357586144031cb43d601617eef45e59460dea6b1e123f708e6885664f44d54f65e5b72b2614af5b8613f3652ced832649c0b991accbc6a85139befa51
   languageName: node
   linkType: hard
 
@@ -37712,7 +37712,7 @@ fsevents@~2.1.1:
     "@nestjs/cli": ^9.4.0
     "@types/chance": ^1.1.2
     "@types/convict": ^6.1.1
-    "@types/node": ^20.11.1
+    "@types/node": ^18.18.2
     "@types/pem-jwk": ^2
     "@types/supertest": ^2.0.11
     "@types/yargs": ^17.0.0
@@ -37755,7 +37755,7 @@ fsevents@~2.1.1:
     "@types/assert": ^1.5.4
     "@types/fast-text-encoding": ^1
     "@types/mocha": ^8
-    "@types/node": ^20.11.1
+    "@types/node": ^18.18.2
     "@types/node-fetch": ^2.5.7
     "@types/prettier": ^2
     abab: ^2.0.6
@@ -37815,7 +37815,7 @@ fsevents@~2.1.1:
     "@types/mjml": ^4.7.0
     "@types/mocha": ^8.2.2
     "@types/nock": ^11.1.0
-    "@types/node": ^20.11.1
+    "@types/node": ^18.18.2
     "@types/node-zendesk": ^2.0.2
     "@types/nodemailer": ^6.4.2
     "@types/request": 2.48.5
@@ -38181,7 +38181,7 @@ fsevents@~2.1.1:
     "@types/convict": ^5.2.2
     "@types/express": ^4.17.12
     "@types/jest": ^26.0.23
-    "@types/node": ^20.11.1
+    "@types/node": ^18.18.2
     "@types/passport": ^1.0.6
     "@types/passport-jwt": ^3.0.5
     "@types/rimraf": 3.0.0
@@ -38261,7 +38261,7 @@ fsevents@~2.1.1:
     "@types/graphql": ^14.5.0
     "@types/ioredis": ^4.26.4
     "@types/jest": ^29.2.5
-    "@types/node": ^20.11.1
+    "@types/node": ^18.18.2
     "@types/passport": ^1.0.6
     "@types/passport-http-bearer": ^1.0.36
     "@types/superagent": 4.1.11
@@ -38364,7 +38364,7 @@ fsevents@~2.1.1:
     "@types/jest": ^26.0.23
     "@types/jsdom": ^16.2.11
     "@types/nock": ^11.1.0
-    "@types/node": ^20.11.1
+    "@types/node": ^18.18.2
     "@types/postcss-import": ^12
     "@types/react-redux": ^7.1.18
     "@types/react-stripe-elements": ^6.0.6
@@ -38512,7 +38512,7 @@ fsevents@~2.1.1:
     "@types/classnames": ^2.3.1
     "@types/file-loader": ^5.0.0
     "@types/jest": ^26.0.23
-    "@types/node": ^20.11.1
+    "@types/node": ^18.18.2
     "@types/postcss-import": ^14
     "@types/prettier": 2.3.0
     "@types/react-helmet": ^6.1.6
@@ -38589,7 +38589,7 @@ fsevents@~2.1.1:
     "@types/jest": ^26.0.23
     "@types/lodash.groupby": ^4
     "@types/material-ui": ^0.21.8
-    "@types/node": ^20.11.1
+    "@types/node": ^18.18.2
     "@types/prop-types": ^15
     "@types/reach__router": ^1.3.11
     "@types/react-router": ^5.1.19
@@ -38707,7 +38707,7 @@ fsevents@~2.1.1:
     "@types/lodash.pick": ^4
     "@types/mocha": ^8.2.2
     "@types/mysql": ^2
-    "@types/node": ^20.11.1
+    "@types/node": ^18.18.2
     "@types/proxyquire": ^1.3.28
     "@types/sinon": 10.0.1
     "@types/superagent": ^4.1.11
@@ -38840,7 +38840,7 @@ fsevents@~2.1.1:
     "@types/babel__core": ^7
     "@types/jest": ^29.5.1
     "@types/mysql": ^2
-    "@types/node": ^20.11.1
+    "@types/node": ^18.18.2
     "@types/passport": ^1.0.6
     "@types/passport-http-bearer": ^1.0.36
     "@types/passport-jwt": ^4