diff --git a/.github/workflows/deploy-prod.yml b/.github/workflows/deploy-prod.yml
index 239c81b22..3b51f3814 100644
--- a/.github/workflows/deploy-prod.yml
+++ b/.github/workflows/deploy-prod.yml
@@ -21,10 +21,10 @@ jobs:
       - name: Checkout
         uses: actions/checkout@8e5e7e5ab8b370d6c329ec480221332ada57f0ab # v3.5.2
 
-      - name: Use Node.js 18
-        uses: actions/setup-node@64ed1c7eab4cce3362f8c340dee64e5eaeef8f7c # v3.6.0
+      - name: Use Node.js 20
+        uses: actions/setup-node@60edb5dd545a775178f52524783378180af0d1f8 # v4.0.2
         with:
-          node-version: 18
+          node-version: 20
 
       - name: Populate env file
         run: |
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index a9aac2709..942102a88 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        node-version: [18.x]
+        node-version: [20.x]
 
     steps:
       - name: Checkout repository
@@ -32,7 +32,7 @@ jobs:
             ${{ runner.os }}-${{ hashFiles('package-lock.json') }}
 
       - name: Use Node.js ${{matrix.node-version}}
-        uses: actions/setup-node@5e21ff4d9bc1a8cf6de233a3057d20ec6b3fb69d # v3.8.1
+        uses: actions/setup-node@60edb5dd545a775178f52524783378180af0d1f8 # v4.0.2
         with:
           node-version: ${{ matrix.node-version }}
 
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 14df36ac4..f30a64ee4 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,15 @@ All notable changes to this project will be documented in this file. The format
 
 ## [UNRELEASED]
 
+### Changed
+
+- Node.js 20 is now the default runtime for all Cloud Functions and when running
+  the app locally.
+
+### Removed
+
+- Dropped support for Node.js 18 and below.
+
 ### Security
 
 - Updated dependencies.
diff --git a/README.md b/README.md
index 3d853ff3a..ee70b75de 100644
--- a/README.md
+++ b/README.md
@@ -40,7 +40,7 @@ If you would like to check out how the application works, you can go to the demo
 
 ## Project requirements
 
-- Node 18.x
+- Node 20.x
 - Firebase 10.x
 - Firebase tools >9.x
 - Firebase Blaze plan - Pay as you go
diff --git a/functions/package-lock.json b/functions/package-lock.json
index 4ee7b9569..acf4767b2 100644
--- a/functions/package-lock.json
+++ b/functions/package-lock.json
@@ -22,7 +22,7 @@
         "firebase-functions-test": "^0.3.3"
       },
       "engines": {
-        "node": "18"
+        "node": "20"
       }
     },
     "node_modules/@babel/runtime": {
diff --git a/functions/package.json b/functions/package.json
index a35c49a6e..a3b84f409 100644
--- a/functions/package.json
+++ b/functions/package.json
@@ -11,7 +11,7 @@
     "logs": "firebase functions:log"
   },
   "engines": {
-    "node": "18"
+    "node": "20"
   },
   "dependencies": {
     "cors": "^2.8.5",
diff --git a/package-lock.json b/package-lock.json
index 61eb8bcf2..7b052389a 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -72,7 +72,7 @@
         "vite": "^4.5.5"
       },
       "engines": {
-        "node": "18"
+        "node": "20"
       }
     },
     "node_modules/@aashutoshrathi/word-wrap": {
diff --git a/package.json b/package.json
index bcdcb30a5..34562d7aa 100644
--- a/package.json
+++ b/package.json
@@ -19,7 +19,7 @@
     "export_mock_data": "firebase emulators:export ./mock_data"
   },
   "engines": {
-    "node": "18"
+    "node": "20"
   },
   "dependencies": {
     "@oslokommune/punkt-vue2": "^9.2.6",