diff --git a/.github/workflows/build.yaml b/.github/workflows/build.yaml
index b33011910..58655382a 100644
--- a/.github/workflows/build.yaml
+++ b/.github/workflows/build.yaml
@@ -12,7 +12,7 @@ jobs:
       - name: Use Node.js
         uses: actions/setup-node@v4
         with:
-          node-version: '22.6.x'
+          node-version: '20.9.x'
       - run: npm ci
       - run: npm run build-glean
       # Verify that the build (incl. type-checking) succeeds
diff --git a/.github/workflows/e2e_cron.yml b/.github/workflows/e2e_cron.yml
index be53cb56c..9d0be2dfb 100644
--- a/.github/workflows/e2e_cron.yml
+++ b/.github/workflows/e2e_cron.yml
@@ -21,7 +21,7 @@ jobs:
       - uses: actions/checkout@v4
       - uses: actions/setup-node@v4
         with:
-          node-version: 22.6.x
+          node-version: 20.9.x
 
       - name: Install dependencies
         run: npm ci
diff --git a/.github/workflows/e2e_pr.yml b/.github/workflows/e2e_pr.yml
index 63629f615..7f7862ab2 100644
--- a/.github/workflows/e2e_pr.yml
+++ b/.github/workflows/e2e_pr.yml
@@ -32,7 +32,7 @@ jobs:
       - uses: actions/checkout@v4
       - uses: actions/setup-node@v4
         with:
-          node-version: 22.6.x
+          node-version: 20.9.x
 
       - name: Install dependencies
         run: npm ci
diff --git a/.github/workflows/lint.yaml b/.github/workflows/lint.yaml
index 05d4a9598..86cc955ec 100644
--- a/.github/workflows/lint.yaml
+++ b/.github/workflows/lint.yaml
@@ -12,7 +12,7 @@ jobs:
       - name: Use Node.js
         uses: actions/setup-node@v4
         with:
-          node-version: '22.6.x'
+          node-version: '20.9.x'
       - run: npm ci
       - run: npm run build-glean
       - run: npm run build-nimbus
diff --git a/.github/workflows/unittests.yaml b/.github/workflows/unittests.yaml
index 83c3a974b..7da91d356 100644
--- a/.github/workflows/unittests.yaml
+++ b/.github/workflows/unittests.yaml
@@ -12,7 +12,7 @@ jobs:
       - name: Use Node.js
         uses: actions/setup-node@v4
         with:
-          node-version: '22.6.x'
+          node-version: '20.9.x'
       - run: npm ci
       - run: npm run build-glean
       - run: npm test
diff --git a/Dockerfile b/Dockerfile
index bd47208bf..aa6d55a06 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM node:22.6-alpine
+FROM node:20.9-alpine
 
 RUN addgroup -g 10001 app && \
     adduser -D -G app -h /app -u 10001 app
diff --git a/Dockerfile.cloudrun b/Dockerfile.cloudrun
index 12480110a..cb923c2b2 100644
--- a/Dockerfile.cloudrun
+++ b/Dockerfile.cloudrun
@@ -1,4 +1,4 @@
-FROM node:22.6-alpine
+FROM node:20.9-alpine
 
 RUN addgroup -g 10001 app && \
     adduser -D -G app -h /app -u 10001 app
diff --git a/docs/dependency-updates.md b/docs/dependency-updates.md
index 5f1bb6f3e..0db7470c7 100644
--- a/docs/dependency-updates.md
+++ b/docs/dependency-updates.md
@@ -56,7 +56,7 @@ Alpine Linux distribution with the latest version of Node.
 
 GitHub's Dependabot only updates `Dockerfile`, but the Node version is specified in many
 different config files. The PR that Dependabot opens will always fail the lint check because
-the script `scripts/check-node-version-alignment.js` will fail if the Node version isn't
+the script `./src/scripts/build/checkNodeVersionAlignment.js` will fail if the Node version isn't
 set consistently across all config files.
 
 1. clone the branch that Dependabot creates
@@ -70,7 +70,7 @@ git clone dependabot/docker/node-22.6-alpine
 2. Run the Node version alignment script and fix any problems it finds
 
 ```sh
-node scripts/check-node-version-alignment.js
+node ./src/scripts/build/checkNodeVersionAlignment.js
 ```
 
 3. Commit and push to branch Dependabot opened
diff --git a/esbuild.cronjobs.js b/esbuild.cronjobs.js
index 0c939e74f..63a18b9ee 100644
--- a/esbuild.cronjobs.js
+++ b/esbuild.cronjobs.js
@@ -21,6 +21,6 @@ build({
   format: "esm",
   outdir: "dist/scripts/cronjobs/",
   sourcemap: true,
-  target: "node22.6",
+  target: "node20.9",
   packages: "external",
 });
diff --git a/netlify.toml b/netlify.toml
index 84e61375b..40ae910e2 100644
--- a/netlify.toml
+++ b/netlify.toml
@@ -18,4 +18,4 @@
   # Default build command.
   command = "npm ci; npm run build-storybook"
 
-  environment = { NODE_VERSION = "22.6.0", NPM_VERSION = "10.8.1" }
+  environment = { NODE_VERSION = "20.9.0", NPM_VERSION = "10.1.0" }
diff --git a/package-lock.json b/package-lock.json
index 12c145f50..a1d8cacf4 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -106,8 +106,8 @@
         "yaml": "^2.5.0"
       },
       "engines": {
-        "node": "22.6.x",
-        "npm": "10.8.x"
+        "node": "20.9.x",
+        "npm": "10.1.x"
       }
     },
     "node_modules/@aashutoshrathi/word-wrap": {
diff --git a/package.json b/package.json
index 65d0932bd..28e85d049 100644
--- a/package.json
+++ b/package.json
@@ -3,8 +3,8 @@
   "version": "1.0.0",
   "description": "Firefox Monitor",
   "engines": {
-    "node": "22.6.x",
-    "npm": "10.8.x"
+    "node": "20.9.x",
+    "npm": "10.1.x"
   },
   "type": "module",
   "scripts": {
@@ -58,8 +58,8 @@
   "homepage": "https://github.com/mozilla/blurts-server",
   "license": "MPL-2.0",
   "volta": {
-    "node": "22.6.0",
-    "npm": "10.8.1"
+    "node": "20.9.0",
+    "npm": "10.1.0"
   },
   "dependencies": {
     "@aws-sdk/client-s3": "^3.637.0",