diff --git a/.github/workflows/on-push.yaml b/.github/workflows/on-push.yaml
index 232315f..02a310b 100644
--- a/.github/workflows/on-push.yaml
+++ b/.github/workflows/on-push.yaml
@@ -9,7 +9,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest, windows-latest] # macos-latest is too slow
-        node-version: [18.x, 16.x, 14.x]
+        node-version: [20.x, 18.x, 16.x, 14.x]
 
     steps:
     - uses: actions/checkout@v2
diff --git a/.github/workflows/on-release.yaml b/.github/workflows/on-release.yaml
index b85f33e..9de85f4 100644
--- a/.github/workflows/on-release.yaml
+++ b/.github/workflows/on-release.yaml
@@ -10,7 +10,7 @@ jobs:
     # Setup .npmrc file to publish to npm
     - uses: actions/setup-node@v1
       with:
-        node-version: '18.x'
+        node-version: '20.x'
         # Needs to be explicitly specified for auth to work
         registry-url: 'https://registry.npmjs.org'
     - run: npm ci
diff --git a/README.md b/README.md
index 620907a..5503d2d 100644
--- a/README.md
+++ b/README.md
@@ -258,7 +258,7 @@ The permissions can also be added to all lambdas using setting the role to `IamR
 ```yaml
 provider:
   name: aws
-  runtime: nodejs18.x
+  runtime: nodejs20.x
   iamRoleStatements:
     - Effect: 'Allow'
       Action:
diff --git a/src/warmer.js b/src/warmer.js
index 6f0fade..2be8988 100644
--- a/src/warmer.js
+++ b/src/warmer.js
@@ -220,7 +220,7 @@ function addWarmUpFunctionToService(service, warmerName, warmerConfig) {
     memorySize: warmerConfig.memorySize,
     name: warmerConfig.name,
     ...(warmerConfig.architecture ? { architecture: warmerConfig.architecture } : {}),
-    runtime: 'nodejs18.x',
+    runtime: 'nodejs20.x',
     package: warmerConfig.package,
     timeout: warmerConfig.timeout,
     ...(Object.keys(warmerConfig.environment).length
diff --git a/test/utils/configUtils.js b/test/utils/configUtils.js
index 9cddfc4..fe80a48 100644
--- a/test/utils/configUtils.js
+++ b/test/utils/configUtils.js
@@ -78,7 +78,7 @@ function getExpectedFunctionConfig(options = {}) {
     handler: `.warmup/${warmerName}/index.warmUp`,
     memorySize: 128,
     name: `warmup-test-dev-warmup-plugin-${warmerName}`,
-    runtime: 'nodejs18.x',
+    runtime: 'nodejs20.x',
     package: {
       individually: true,
       patterns: ['!**', path.join('.warmup', warmerName, '**')],