diff --git a/docs/cli-reference/print.md b/docs/cli-reference/print.md
index f98d3b961..eb6d1c86c 100644
--- a/docs/cli-reference/print.md
+++ b/docs/cli-reference/print.md
@@ -30,7 +30,7 @@ custom:
 
 provider:
   name: aws
-  runtime: nodejs18.x
+  runtime: nodejs20.x
 
 functions:
   hello:
@@ -53,7 +53,7 @@ custom:
   bucketName: test
 provider:
   name: aws
-  runtime: nodejs18.x
+  runtime: nodejs20.x
   stage: dev # <-- Resolved
 functions:
   hello:
diff --git a/docs/events/apigateway.md b/docs/events/apigateway.md
index d84ed239c..c35bdc622 100644
--- a/docs/events/apigateway.md
+++ b/docs/events/apigateway.md
@@ -1456,7 +1456,7 @@ service: my-api
 
 provider:
   name: aws
-  runtime: nodejs18.x
+  runtime: nodejs20.x
   stage: dev
   region: eu-west-2
 
@@ -1645,7 +1645,7 @@ Resource policies are policy documents that are used to control the invocation o
 ```yml
 provider:
   name: aws
-  runtime: nodejs18.x
+  runtime: nodejs20.x
 
   apiGateway:
     resourcePolicy:
diff --git a/docs/events/websocket.md b/docs/events/websocket.md
index 140a667bb..1ced274a9 100644
--- a/docs/events/websocket.md
+++ b/docs/events/websocket.md
@@ -61,7 +61,7 @@ service: serverless-ws-test
 
 provider:
   name: aws
-  runtime: nodejs18.x
+  runtime: nodejs20.x
   websocketsApiName: custom-websockets-api-name
   websocketsApiRouteSelectionExpression: $request.body.action # custom routes are selected by the value of the action property in the body
   websocketsDescription: Custom Serverless Websockets
diff --git a/docs/guides/credentials.md b/docs/guides/credentials.md
index ace7c1890..b57898556 100644
--- a/docs/guides/credentials.md
+++ b/docs/guides/credentials.md
@@ -127,7 +127,7 @@ You can even set up different profiles for different accounts, which can be used
 service: new-service
 provider:
   name: aws
-  runtime: nodejs18.x
+  runtime: nodejs20.x
   stage: dev
   profile: devProfile
 ```
@@ -175,7 +175,7 @@ This example `serverless.yml` snippet will load the profile depending upon the s
 service: new-service
 provider:
   name: aws
-  runtime: nodejs18.x
+  runtime: nodejs20.x
   profile: ${self:custom.profiles.${sls:stage}}
 custom:
   profiles:
diff --git a/docs/guides/functions.md b/docs/guides/functions.md
index dc1a469b8..9911e74cc 100644
--- a/docs/guides/functions.md
+++ b/docs/guides/functions.md
@@ -12,7 +12,7 @@ service: myService
 
 provider:
   name: aws
-  runtime: nodejs18.x
+  runtime: nodejs20.x
   runtimeManagement: auto # optional, set how Lambda controls all functions runtime. AWS default is auto; this can either be 'auto' or 'onFunctionUpdate'. For 'manual', see example in hello function below (syntax for both is identical)
   memorySize: 512 # optional, in MB, default is 1024
   timeout: 10 # optional, in seconds, default is 6
@@ -52,7 +52,7 @@ service: myService
 
 provider:
   name: aws
-  runtime: nodejs18.x
+  runtime: nodejs20.x
 
 functions:
   functionOne:
@@ -72,7 +72,7 @@ service: myService
 
 provider:
   name: aws
-  runtime: nodejs18.x
+  runtime: nodejs20.x
   memorySize: 512 # will be inherited by all functions
 
 functions:
@@ -88,7 +88,7 @@ service: myService
 
 provider:
   name: aws
-  runtime: nodejs18.x
+  runtime: nodejs20.x
 
 functions:
   functionOne:
@@ -124,7 +124,7 @@ service: myService
 
 provider:
   name: aws
-  runtime: nodejs18.x
+  runtime: nodejs20.x
   iam:
     role:
       statements: # permissions for all of your functions can be set here
@@ -727,7 +727,7 @@ service: service
 
 provider:
   name: aws
-  runtime: nodejs18.x
+  runtime: nodejs20.x
 
 functions:
   hello:
@@ -780,7 +780,7 @@ service: myService
 
 provider:
   name: aws
-  runtime: nodejs18.x
+  runtime: nodejs20.x
   tracing:
     lambda: true
 ```
diff --git a/docs/guides/serverless.yml.md b/docs/guides/serverless.yml.md
index 76605699e..867db209d 100644
--- a/docs/guides/serverless.yml.md
+++ b/docs/guides/serverless.yml.md
@@ -101,7 +101,7 @@ Some function settings can be defined for all functions inside the `provider` ke
 # serverless.yml
 
 provider:
-  runtime: nodejs18.x
+  runtime: nodejs20.x
   runtimeManagement: auto # optional, set how Lambda controls all functions runtime. AWS default is auto; this can either be 'auto' or 'onFunctionUpdate'. For 'manual', see example in hello function below (syntax for both is identical
   # Default memory size for functions (default: 1024MB)
   memorySize: 512
@@ -607,7 +607,7 @@ functions:
     # Container image to use. Cannot be used with 'handler'.
     # Can be the URI of an image in ECR, or the name of an image defined in 'provider.ecr.images'
     image: baseimage
-    runtime: nodejs18.x
+    runtime: nodejs20.x
     runtimeManagement:
       mode: manual # syntax required for manual, mode property also supports 'auto' or 'onFunctionUpdate' (see provider.runtimeManagement)
       arn: <aws runtime arn> # required when mode is manual
diff --git a/docs/guides/services.md b/docs/guides/services.md
index 6af6d2035..2c0c09c50 100644
--- a/docs/guides/services.md
+++ b/docs/guides/services.md
@@ -85,7 +85,7 @@ service: users
 
 provider:
   name: aws
-  runtime: nodejs18.x
+  runtime: nodejs20.x
   stage: dev # Set the default stage used. Default is dev
   region: us-east-1 # Overwrite the default region used. Default is us-east-1
   profile: production # The default profile to use with this service
@@ -164,7 +164,7 @@ service: users
 
 provider:
   name: aws
-  runtime: nodejs18.x
+  runtime: nodejs20.x
   memorySize: 512
 
 …
@@ -181,7 +181,7 @@ service: users
 
 provider:
   name: aws
-  runtime: nodejs18.x
+  runtime: nodejs20.x
   memorySize: 512
 
 …
diff --git a/docs/guides/variables.md b/docs/guides/variables.md
index 66a4477cd..4b597145c 100644
--- a/docs/guides/variables.md
+++ b/docs/guides/variables.md
@@ -199,7 +199,7 @@ You can add such custom output to CloudFormation stack. For example:
 service: another-service
 provider:
   name: aws
-  runtime: nodejs18.x
+  runtime: nodejs20.x
   region: ap-northeast-1
   memorySize: 512
 functions:
diff --git a/lib/plugins/aws/custom-resources/index.js b/lib/plugins/aws/custom-resources/index.js
index 5c0d3183f..6d90da5bf 100644
--- a/lib/plugins/aws/custom-resources/index.js
+++ b/lib/plugins/aws/custom-resources/index.js
@@ -162,7 +162,7 @@ async function addCustomResourceToService(awsProvider, resourceName, iamRoleStat
     });
   }
 
-  let runtimeVersion = 'nodejs18.x';
+  let runtimeVersion = 'nodejs20.x';
   const providerRuntime = awsProvider.getRuntime();
   if (providerRuntime.startsWith('nodejs')) {
     runtimeVersion = providerRuntime;
diff --git a/lib/plugins/package/lib/package-service.js b/lib/plugins/package/lib/package-service.js
index 4db0073b5..735e9e40c 100644
--- a/lib/plugins/package/lib/package-service.js
+++ b/lib/plugins/package/lib/package-service.js
@@ -29,7 +29,7 @@ module.exports = {
   },
 
   getRuntime(runtime) {
-    const defaultRuntime = 'nodejs18.x';
+    const defaultRuntime = 'nodejs20.x';
     return runtime || this.serverless.service.provider.runtime || defaultRuntime;
   },
 
diff --git a/test/fixtures/cli/variables/serverless.yml b/test/fixtures/cli/variables/serverless.yml
index 19909d2cd..1e5e510c8 100644
--- a/test/fixtures/cli/variables/serverless.yml
+++ b/test/fixtures/cli/variables/serverless.yml
@@ -3,7 +3,7 @@ configValidationMode: error
 
 provider:
   name: aws
-  runtime: nodejs18.x
+  runtime: nodejs20.x
 
 custom:
   importedFile: ${file(config.json)}
diff --git a/test/fixtures/programmatic/api-gateway-extended/serverless.yml b/test/fixtures/programmatic/api-gateway-extended/serverless.yml
index dc82f1fc2..7ac71c0f4 100644
--- a/test/fixtures/programmatic/api-gateway-extended/serverless.yml
+++ b/test/fixtures/programmatic/api-gateway-extended/serverless.yml
@@ -5,7 +5,7 @@ frameworkVersion: '*'
 
 provider:
   name: aws
-  runtime: nodejs18.x
+  runtime: nodejs20.x
   versionFunctions: false
   apiGateway:
     shouldStartNameWithService: true
diff --git a/test/fixtures/programmatic/api-gateway/serverless.yml b/test/fixtures/programmatic/api-gateway/serverless.yml
index d6b3c92f9..132a0ff1a 100644
--- a/test/fixtures/programmatic/api-gateway/serverless.yml
+++ b/test/fixtures/programmatic/api-gateway/serverless.yml
@@ -5,7 +5,7 @@ frameworkVersion: '*'
 
 provider:
   name: aws
-  runtime: nodejs18.x
+  runtime: nodejs20.x
   apiGateway:
     shouldStartNameWithService: true
 
diff --git a/test/fixtures/programmatic/check-for-changes/serverless.yml b/test/fixtures/programmatic/check-for-changes/serverless.yml
index c57668afd..b5ac86b43 100644
--- a/test/fixtures/programmatic/check-for-changes/serverless.yml
+++ b/test/fixtures/programmatic/check-for-changes/serverless.yml
@@ -5,7 +5,7 @@ frameworkVersion: '*'
 
 provider:
   name: aws
-  runtime: nodejs18.x
+  runtime: nodejs20.x
 
 functions:
   fn1:
diff --git a/test/fixtures/programmatic/cognito-user-pool/serverless.yml b/test/fixtures/programmatic/cognito-user-pool/serverless.yml
index f3455711c..d70218a93 100644
--- a/test/fixtures/programmatic/cognito-user-pool/serverless.yml
+++ b/test/fixtures/programmatic/cognito-user-pool/serverless.yml
@@ -4,7 +4,7 @@ configValidationMode: error
 
 provider:
   name: aws
-  runtime: nodejs18.x
+  runtime: nodejs20.x
   versionFunctions: false
 
 functions:
diff --git a/test/fixtures/programmatic/config-schema-extensions-error/serverless.yml b/test/fixtures/programmatic/config-schema-extensions-error/serverless.yml
index 9630fe1c2..9e7dff593 100644
--- a/test/fixtures/programmatic/config-schema-extensions-error/serverless.yml
+++ b/test/fixtures/programmatic/config-schema-extensions-error/serverless.yml
@@ -2,7 +2,7 @@ service: configSchemaExtensionsError
 
 provider:
   name: someProvider
-  runtime: nodejs18.x
+  runtime: nodejs20.x
 
 configValidationMode: error
 frameworkVersion: '*'
diff --git a/test/fixtures/programmatic/curated-plugins/serverless.yml b/test/fixtures/programmatic/curated-plugins/serverless.yml
index 0c78041e7..8ab675ff3 100644
--- a/test/fixtures/programmatic/curated-plugins/serverless.yml
+++ b/test/fixtures/programmatic/curated-plugins/serverless.yml
@@ -10,7 +10,7 @@ custom:
 
 provider:
   name: aws
-  runtime: nodejs18.x
+  runtime: nodejs20.x
 
 functions:
   function:
diff --git a/test/fixtures/programmatic/ecr/serverless.yml b/test/fixtures/programmatic/ecr/serverless.yml
index 44c2102c0..c9b2010c1 100644
--- a/test/fixtures/programmatic/ecr/serverless.yml
+++ b/test/fixtures/programmatic/ecr/serverless.yml
@@ -5,7 +5,7 @@ frameworkVersion: '*'
 
 provider:
   name: aws
-  runtime: nodejs18.x
+  runtime: nodejs20.x
   ecr:
     images:
       baseimage:
diff --git a/test/fixtures/programmatic/event-bridge/serverless.yml b/test/fixtures/programmatic/event-bridge/serverless.yml
index 91037f251..6531560df 100644
--- a/test/fixtures/programmatic/event-bridge/serverless.yml
+++ b/test/fixtures/programmatic/event-bridge/serverless.yml
@@ -4,7 +4,7 @@ configValidationMode: error
 
 provider:
   name: aws
-  runtime: nodejs18.x
+  runtime: nodejs20.x
   versionFunctions: false
 
 functions:
diff --git a/test/fixtures/programmatic/function-active-mq/serverless.yml b/test/fixtures/programmatic/function-active-mq/serverless.yml
index 4cfe92cc9..215bb2943 100644
--- a/test/fixtures/programmatic/function-active-mq/serverless.yml
+++ b/test/fixtures/programmatic/function-active-mq/serverless.yml
@@ -8,7 +8,7 @@ frameworkVersion: '*'
 
 provider:
   name: aws
-  runtime: nodejs18.x
+  runtime: nodejs20.x
   versionFunctions: false
 
 functions:
diff --git a/test/fixtures/programmatic/function-cloud-front/serverless.yml b/test/fixtures/programmatic/function-cloud-front/serverless.yml
index 96fe123c1..fa10e1775 100644
--- a/test/fixtures/programmatic/function-cloud-front/serverless.yml
+++ b/test/fixtures/programmatic/function-cloud-front/serverless.yml
@@ -5,7 +5,7 @@ frameworkVersion: '*'
 
 provider:
   name: aws
-  runtime: nodejs18.x
+  runtime: nodejs20.x
 
 functions:
   foo:
diff --git a/test/fixtures/programmatic/function-efs/serverless.yml b/test/fixtures/programmatic/function-efs/serverless.yml
index a19fd856d..334f3d6de 100644
--- a/test/fixtures/programmatic/function-efs/serverless.yml
+++ b/test/fixtures/programmatic/function-efs/serverless.yml
@@ -7,7 +7,7 @@ configValidationMode: error
 
 provider:
   name: aws
-  runtime: nodejs18.x
+  runtime: nodejs20.x
   versionFunctions: false
 
 functions:
diff --git a/test/fixtures/programmatic/function-layers/serverless.yml b/test/fixtures/programmatic/function-layers/serverless.yml
index 18354bcca..cea20366a 100644
--- a/test/fixtures/programmatic/function-layers/serverless.yml
+++ b/test/fixtures/programmatic/function-layers/serverless.yml
@@ -1,7 +1,7 @@
 service: service
 provider:
   name: aws
-  runtime: nodejs18.x
+  runtime: nodejs20.x
 
 layers:
   testLayer:
diff --git a/test/fixtures/programmatic/function-msk/serverless.yml b/test/fixtures/programmatic/function-msk/serverless.yml
index 4cfe92cc9..215bb2943 100644
--- a/test/fixtures/programmatic/function-msk/serverless.yml
+++ b/test/fixtures/programmatic/function-msk/serverless.yml
@@ -8,7 +8,7 @@ frameworkVersion: '*'
 
 provider:
   name: aws
-  runtime: nodejs18.x
+  runtime: nodejs20.x
   versionFunctions: false
 
 functions:
diff --git a/test/fixtures/programmatic/function-rabbit-mq/serverless.yml b/test/fixtures/programmatic/function-rabbit-mq/serverless.yml
index 4cfe92cc9..215bb2943 100644
--- a/test/fixtures/programmatic/function-rabbit-mq/serverless.yml
+++ b/test/fixtures/programmatic/function-rabbit-mq/serverless.yml
@@ -8,7 +8,7 @@ frameworkVersion: '*'
 
 provider:
   name: aws
-  runtime: nodejs18.x
+  runtime: nodejs20.x
   versionFunctions: false
 
 functions:
diff --git a/test/fixtures/programmatic/function/serverless.yml b/test/fixtures/programmatic/function/serverless.yml
index 5e86a36fe..598c23344 100644
--- a/test/fixtures/programmatic/function/serverless.yml
+++ b/test/fixtures/programmatic/function/serverless.yml
@@ -5,7 +5,7 @@ frameworkVersion: '*'
 
 provider:
   name: aws
-  runtime: nodejs18.x
+  runtime: nodejs20.x
 
 functions:
   basic:
diff --git a/test/fixtures/programmatic/http-api-catch-all/serverless.yml b/test/fixtures/programmatic/http-api-catch-all/serverless.yml
index 1650ec206..16ff42869 100644
--- a/test/fixtures/programmatic/http-api-catch-all/serverless.yml
+++ b/test/fixtures/programmatic/http-api-catch-all/serverless.yml
@@ -5,7 +5,7 @@ frameworkVersion: '*'
 
 provider:
   name: aws
-  runtime: nodejs18.x
+  runtime: nodejs20.x
 
 functions:
   foo:
diff --git a/test/fixtures/programmatic/http-api-export/serverless.yml b/test/fixtures/programmatic/http-api-export/serverless.yml
index ef3968dda..0e0f7642f 100644
--- a/test/fixtures/programmatic/http-api-export/serverless.yml
+++ b/test/fixtures/programmatic/http-api-export/serverless.yml
@@ -5,7 +5,7 @@ frameworkVersion: '*'
 
 provider:
   name: aws
-  runtime: nodejs18.x
+  runtime: nodejs20.x
 
 resources:
   Resources:
diff --git a/test/fixtures/programmatic/http-api/serverless.yml b/test/fixtures/programmatic/http-api/serverless.yml
index a82a992f5..1e3895d4e 100644
--- a/test/fixtures/programmatic/http-api/serverless.yml
+++ b/test/fixtures/programmatic/http-api/serverless.yml
@@ -5,7 +5,7 @@ frameworkVersion: '*'
 
 provider:
   name: aws
-  runtime: nodejs18.x
+  runtime: nodejs20.x
   logRetentionInDays: 14
 
 functions:
diff --git a/test/fixtures/programmatic/invocation/serverless.yml b/test/fixtures/programmatic/invocation/serverless.yml
index 1477dbba3..50294fdac 100644
--- a/test/fixtures/programmatic/invocation/serverless.yml
+++ b/test/fixtures/programmatic/invocation/serverless.yml
@@ -5,7 +5,7 @@ frameworkVersion: '*'
 
 provider:
   name: aws
-  runtime: nodejs18.x
+  runtime: nodejs20.x
 
 functions:
   callback:
diff --git a/test/fixtures/programmatic/iot-fleet-provisioning/serverless.yml b/test/fixtures/programmatic/iot-fleet-provisioning/serverless.yml
index 4999187db..68a686ab9 100644
--- a/test/fixtures/programmatic/iot-fleet-provisioning/serverless.yml
+++ b/test/fixtures/programmatic/iot-fleet-provisioning/serverless.yml
@@ -5,7 +5,7 @@ frameworkVersion: '*'
 
 provider:
   name: aws
-  runtime: nodejs18.x
+  runtime: nodejs20.x
   versionFunctions: false
 
 functions:
diff --git a/test/fixtures/programmatic/iot/serverless.yml b/test/fixtures/programmatic/iot/serverless.yml
index e42d50edb..7aa8ea7a1 100644
--- a/test/fixtures/programmatic/iot/serverless.yml
+++ b/test/fixtures/programmatic/iot/serverless.yml
@@ -4,7 +4,7 @@ configValidationMode: error
 
 provider:
   name: aws
-  runtime: nodejs18.x
+  runtime: nodejs20.x
   versionFunctions: false
 
 functions:
diff --git a/test/fixtures/programmatic/layer/serverless.yml b/test/fixtures/programmatic/layer/serverless.yml
index e693d576e..ee63a1051 100644
--- a/test/fixtures/programmatic/layer/serverless.yml
+++ b/test/fixtures/programmatic/layer/serverless.yml
@@ -5,7 +5,7 @@ frameworkVersion: '*'
 
 provider:
   name: aws
-  runtime: nodejs18.x
+  runtime: nodejs20.x
 
 functions:
   function:
diff --git a/test/fixtures/programmatic/multi-service/service-a/serverless.yml b/test/fixtures/programmatic/multi-service/service-a/serverless.yml
index cea3ab4a9..043732ea7 100644
--- a/test/fixtures/programmatic/multi-service/service-a/serverless.yml
+++ b/test/fixtures/programmatic/multi-service/service-a/serverless.yml
@@ -5,7 +5,7 @@ frameworkVersion: '*'
 
 provider:
   name: aws
-  runtime: nodejs18.x
+  runtime: nodejs20.x
 
 custom:
   env: ${env:ENV_SOURCE_TEST, null}
diff --git a/test/fixtures/programmatic/package-artifact-in-serverless-dir/serverless.yml b/test/fixtures/programmatic/package-artifact-in-serverless-dir/serverless.yml
index 97566beaa..6006ce86e 100644
--- a/test/fixtures/programmatic/package-artifact-in-serverless-dir/serverless.yml
+++ b/test/fixtures/programmatic/package-artifact-in-serverless-dir/serverless.yml
@@ -5,7 +5,7 @@ frameworkVersion: '*'
 
 provider:
   name: aws
-  runtime: nodejs18.x
+  runtime: nodejs20.x
 
 plugins:
   # Mutates `package.artifact` to point to copied `.serverless/NAME.zip`
diff --git a/test/fixtures/programmatic/package-artifact/serverless.yml b/test/fixtures/programmatic/package-artifact/serverless.yml
index 5aa2d3e9e..a4c995f2c 100644
--- a/test/fixtures/programmatic/package-artifact/serverless.yml
+++ b/test/fixtures/programmatic/package-artifact/serverless.yml
@@ -5,7 +5,7 @@ frameworkVersion: '*'
 
 provider:
   name: aws
-  runtime: nodejs18.x
+  runtime: nodejs20.x
 
 package:
   artifact: artifact.zip
diff --git a/test/fixtures/programmatic/packaging/serverless.yml b/test/fixtures/programmatic/packaging/serverless.yml
index db87dcc7a..9fabdee83 100644
--- a/test/fixtures/programmatic/packaging/serverless.yml
+++ b/test/fixtures/programmatic/packaging/serverless.yml
@@ -6,7 +6,7 @@ disabledDeprecations: LOAD_VARIABLES_FROM_ENV_FILES
 
 provider:
   name: aws
-  runtime: nodejs18.x
+  runtime: nodejs20.x
 
 functions:
   fnService:
diff --git a/test/fixtures/programmatic/plugin/serverless.yml b/test/fixtures/programmatic/plugin/serverless.yml
index 88490b0b1..4f2e4d8d3 100644
--- a/test/fixtures/programmatic/plugin/serverless.yml
+++ b/test/fixtures/programmatic/plugin/serverless.yml
@@ -5,7 +5,7 @@ frameworkVersion: '*'
 
 provider:
   name: aws
-  runtime: nodejs18.x
+  runtime: nodejs20.x
 
 plugins:
   - ./plugin
diff --git a/test/fixtures/programmatic/provisioned-concurrency/serverless.yml b/test/fixtures/programmatic/provisioned-concurrency/serverless.yml
index b6a87995f..915473ffb 100644
--- a/test/fixtures/programmatic/provisioned-concurrency/serverless.yml
+++ b/test/fixtures/programmatic/provisioned-concurrency/serverless.yml
@@ -4,7 +4,7 @@ configValidationMode: error
 
 provider:
   name: aws
-  runtime: nodejs18.x
+  runtime: nodejs20.x
   versionFunctions: false
 
 functions:
diff --git a/test/fixtures/programmatic/request-parameters/serverless.yml b/test/fixtures/programmatic/request-parameters/serverless.yml
index 291c17336..f298cf11a 100644
--- a/test/fixtures/programmatic/request-parameters/serverless.yml
+++ b/test/fixtures/programmatic/request-parameters/serverless.yml
@@ -2,7 +2,7 @@ service: service
 
 provider:
   name: aws
-  runtime: nodejs18.x
+  runtime: nodejs20.x
 
 functions:
   target:
diff --git a/test/fixtures/programmatic/request-schema/serverless.yml b/test/fixtures/programmatic/request-schema/serverless.yml
index 89fdf93d2..81c1551d2 100644
--- a/test/fixtures/programmatic/request-schema/serverless.yml
+++ b/test/fixtures/programmatic/request-schema/serverless.yml
@@ -2,7 +2,7 @@ service: service
 
 provider:
   name: aws
-  runtime: nodejs18.x
+  runtime: nodejs20.x
   apiGateway:
     request:
       schemas:
diff --git a/test/fixtures/programmatic/s3/serverless.yml b/test/fixtures/programmatic/s3/serverless.yml
index ce32b78fb..0a29e896c 100644
--- a/test/fixtures/programmatic/s3/serverless.yml
+++ b/test/fixtures/programmatic/s3/serverless.yml
@@ -4,7 +4,7 @@ configValidationMode: error
 
 provider:
   name: aws
-  runtime: nodejs18.x
+  runtime: nodejs20.x
   versionFunctions: false
   s3:
     customBucket:
diff --git a/test/fixtures/programmatic/schedule/serverless.yml b/test/fixtures/programmatic/schedule/serverless.yml
index 5ac95dc94..1774c1842 100644
--- a/test/fixtures/programmatic/schedule/serverless.yml
+++ b/test/fixtures/programmatic/schedule/serverless.yml
@@ -4,7 +4,7 @@ configValidationMode: error
 
 provider:
   name: aws
-  runtime: nodejs18.x
+  runtime: nodejs20.x
   versionFunctions: false
 
 functions:
diff --git a/test/fixtures/programmatic/sns/serverless.yml b/test/fixtures/programmatic/sns/serverless.yml
index da770a393..36024cc39 100644
--- a/test/fixtures/programmatic/sns/serverless.yml
+++ b/test/fixtures/programmatic/sns/serverless.yml
@@ -4,7 +4,7 @@ configValidationMode: error
 
 provider:
   name: aws
-  runtime: nodejs18.x
+  runtime: nodejs20.x
   versionFunctions: false
 
 functions:
diff --git a/test/fixtures/programmatic/sqs/serverless.yml b/test/fixtures/programmatic/sqs/serverless.yml
index 8b9b33269..dc41c1eec 100644
--- a/test/fixtures/programmatic/sqs/serverless.yml
+++ b/test/fixtures/programmatic/sqs/serverless.yml
@@ -4,7 +4,7 @@ configValidationMode: error
 
 provider:
   name: aws
-  runtime: nodejs18.x
+  runtime: nodejs20.x
   versionFunctions: false
 
 functions:
diff --git a/test/fixtures/programmatic/stream/serverless.yml b/test/fixtures/programmatic/stream/serverless.yml
index d6b0375a2..a7fca8525 100644
--- a/test/fixtures/programmatic/stream/serverless.yml
+++ b/test/fixtures/programmatic/stream/serverless.yml
@@ -4,7 +4,7 @@ configValidationMode: error
 
 provider:
   name: aws
-  runtime: nodejs18.x
+  runtime: nodejs20.x
   versionFunctions: false
 
 functions:
diff --git a/test/fixtures/programmatic/variables-legacy/serverless.yml b/test/fixtures/programmatic/variables-legacy/serverless.yml
index eb919ee86..40fafbda8 100644
--- a/test/fixtures/programmatic/variables-legacy/serverless.yml
+++ b/test/fixtures/programmatic/variables-legacy/serverless.yml
@@ -2,7 +2,7 @@ service: service
 
 provider:
   name: aws
-  runtime: nodejs18.x
+  runtime: nodejs20.x
 
 custom:
   importedFile: ${file(config.json)}
diff --git a/test/fixtures/programmatic/websocket-external-auth/serverless.yml b/test/fixtures/programmatic/websocket-external-auth/serverless.yml
index 9a5496162..5344ae8b0 100644
--- a/test/fixtures/programmatic/websocket-external-auth/serverless.yml
+++ b/test/fixtures/programmatic/websocket-external-auth/serverless.yml
@@ -4,7 +4,7 @@ configValidationMode: error
 
 provider:
   name: aws
-  runtime: nodejs18.x
+  runtime: nodejs20.x
   versionFunctions: false
 
 functions:
diff --git a/test/fixtures/programmatic/websocket/serverless.yml b/test/fixtures/programmatic/websocket/serverless.yml
index 1feb74dfe..7e3451b3d 100644
--- a/test/fixtures/programmatic/websocket/serverless.yml
+++ b/test/fixtures/programmatic/websocket/serverless.yml
@@ -4,7 +4,7 @@ configValidationMode: error
 
 provider:
   name: aws
-  runtime: nodejs18.x
+  runtime: nodejs20.x
   versionFunctions: false
   logs:
     websocket: true
diff --git a/test/integration-package/cloudformation.tests.js b/test/integration-package/cloudformation.tests.js
index 2b3e05325..1312ea76c 100644
--- a/test/integration-package/cloudformation.tests.js
+++ b/test/integration-package/cloudformation.tests.js
@@ -44,7 +44,7 @@ describe('Integration test - Packaging - CloudFormation', () => {
         Role: {
           'Fn::GetAtt': ['IamRoleLambdaExecution', 'Arn'],
         },
-        Runtime: 'nodejs18.x',
+        Runtime: 'nodejs20.x',
         Timeout: 6,
       },
       DependsOn: ['HelloLogGroup'],
@@ -75,7 +75,7 @@ describe('Integration test - Packaging - CloudFormation', () => {
         Role: {
           'Fn::GetAtt': ['IamRoleLambdaExecution', 'Arn'],
         },
-        Runtime: 'nodejs18.x',
+        Runtime: 'nodejs20.x',
         Timeout: 6,
       },
       DependsOn: ['HelloLogGroup'],
@@ -109,7 +109,7 @@ describe('Integration test - Packaging - CloudFormation', () => {
         Role: {
           'Fn::GetAtt': ['IamRoleLambdaExecution', 'Arn'],
         },
-        Runtime: 'nodejs18.x',
+        Runtime: 'nodejs20.x',
         Timeout: 6,
       },
       DependsOn: ['HelloLogGroup'],
diff --git a/test/integration-package/fixtures/artifact/serverless.yml b/test/integration-package/fixtures/artifact/serverless.yml
index 728b3557e..1d4f16bc1 100644
--- a/test/integration-package/fixtures/artifact/serverless.yml
+++ b/test/integration-package/fixtures/artifact/serverless.yml
@@ -4,7 +4,7 @@ configValidationMode: error
 
 provider:
   name: aws
-  runtime: nodejs18.x
+  runtime: nodejs20.x
 
 functions:
   hello:
diff --git a/test/integration-package/fixtures/individually-function/serverless.yml b/test/integration-package/fixtures/individually-function/serverless.yml
index faa8b7aff..4bdaf0fa0 100644
--- a/test/integration-package/fixtures/individually-function/serverless.yml
+++ b/test/integration-package/fixtures/individually-function/serverless.yml
@@ -4,7 +4,7 @@ configValidationMode: error
 
 provider:
   name: aws
-  runtime: nodejs18.x
+  runtime: nodejs20.x
 
 functions:
   hello:
diff --git a/test/integration-package/fixtures/individually/serverless.yml b/test/integration-package/fixtures/individually/serverless.yml
index f8bec8f56..328fc56ab 100644
--- a/test/integration-package/fixtures/individually/serverless.yml
+++ b/test/integration-package/fixtures/individually/serverless.yml
@@ -4,7 +4,7 @@ configValidationMode: error
 
 provider:
   name: aws
-  runtime: nodejs18.x
+  runtime: nodejs20.x
 
 package:
   individually: true
diff --git a/test/integration-package/fixtures/regular/serverless.yml b/test/integration-package/fixtures/regular/serverless.yml
index 2490f12ab..d9f042b40 100644
--- a/test/integration-package/fixtures/regular/serverless.yml
+++ b/test/integration-package/fixtures/regular/serverless.yml
@@ -4,7 +4,7 @@ configValidationMode: error
 
 provider:
   name: aws
-  runtime: nodejs18.x
+  runtime: nodejs20.x
 
 functions:
   hello:
diff --git a/test/unit/lib/plugins/aws/custom-resources/index.test.js b/test/unit/lib/plugins/aws/custom-resources/index.test.js
index 2cb7d2e48..dac9786f5 100644
--- a/test/unit/lib/plugins/aws/custom-resources/index.test.js
+++ b/test/unit/lib/plugins/aws/custom-resources/index.test.js
@@ -109,7 +109,7 @@ describe('#addCustomResourceToService()', () => {
         Role: {
           'Fn::GetAtt': ['IamRoleCustomResourcesLambdaExecution', 'Arn'],
         },
-        Runtime: 'nodejs18.x',
+        Runtime: 'nodejs20.x',
         Timeout: 180,
       },
       DependsOn: ['IamRoleCustomResourcesLambdaExecution'],
@@ -128,7 +128,7 @@ describe('#addCustomResourceToService()', () => {
         Role: {
           'Fn::GetAtt': ['IamRoleCustomResourcesLambdaExecution', 'Arn'],
         },
-        Runtime: 'nodejs18.x',
+        Runtime: 'nodejs20.x',
         Timeout: 180,
       },
       DependsOn: ['IamRoleCustomResourcesLambdaExecution'],
@@ -147,7 +147,7 @@ describe('#addCustomResourceToService()', () => {
         Role: {
           'Fn::GetAtt': ['IamRoleCustomResourcesLambdaExecution', 'Arn'],
         },
-        Runtime: 'nodejs18.x',
+        Runtime: 'nodejs20.x',
         Timeout: 180,
       },
       DependsOn: ['IamRoleCustomResourcesLambdaExecution'],
diff --git a/test/unit/lib/plugins/aws/invoke-local/index.test.js b/test/unit/lib/plugins/aws/invoke-local/index.test.js
index 35e53dd11..9ed614993 100644
--- a/test/unit/lib/plugins/aws/invoke-local/index.test.js
+++ b/test/unit/lib/plugins/aws/invoke-local/index.test.js
@@ -421,7 +421,7 @@ describe('AwsInvokeLocal', () => {
         it(`should call invokeLocalNodeJs for any node.js runtime version for ${item.path}`, async () => {
           awsInvokeLocal.options.functionObj.handler = item.path;
 
-          awsInvokeLocal.options.functionObj.runtime = 'nodejs18.x';
+          awsInvokeLocal.options.functionObj.runtime = 'nodejs20.x';
           await awsInvokeLocal.invokeLocal();
           expect(invokeLocalNodeJsStub.calledOnce).to.be.equal(true);
           expect(
@@ -563,8 +563,8 @@ describe('AwsInvokeLocal', () => {
       expect(invokeLocalDockerStub.calledWithExactly()).to.be.equal(true);
     });
 
-    it('should call invokeLocalDocker if using --docker option with nodejs18.x', async () => {
-      awsInvokeLocal.options.functionObj.runtime = 'nodejs18.x';
+    it('should call invokeLocalDocker if using --docker option with nodejs20.x', async () => {
+      awsInvokeLocal.options.functionObj.runtime = 'nodejs20.x';
       awsInvokeLocal.options.functionObj.handler = 'handler.foobar';
       awsInvokeLocal.options.docker = true;
       await awsInvokeLocal.invokeLocal();
@@ -706,7 +706,7 @@ describe('AwsInvokeLocal', () => {
           handler: 'handler.hello',
           name: 'hello',
           timeout: 4,
-          runtime: 'nodejs18.x',
+          runtime: 'nodejs20.x',
           environment: {
             functionVar: 'functionValue',
           },
@@ -734,7 +734,7 @@ describe('AwsInvokeLocal', () => {
       expect(spawnExtStub.getCall(0).args).to.deep.equal(['docker', ['version']]);
       expect(spawnExtStub.getCall(1).args).to.deep.equal([
         'docker',
-        ['images', '-q', 'lambci/lambda:nodejs18.x'],
+        ['images', '-q', 'lambci/lambda:nodejs20.x'],
       ]);
       expect(spawnExtStub.getCall(3).args).to.deep.equal([
         'docker',
@@ -765,7 +765,7 @@ describe('AwsInvokeLocal', () => {
           'commandLineEnvVar=commandLineEnvVarValue',
           '-p',
           '9292:9292',
-          'sls-docker-nodejs18.x',
+          'sls-docker-nodejs20.x',
           'handler.hello',
           '{}',
         ],
@@ -1059,7 +1059,7 @@ describe('test/unit/lib/plugins/aws/invokeLocal/index.test.js', () => {
           },
           configExt: {
             provider: {
-              runtime: 'nodejs18.x',
+              runtime: 'nodejs20.x',
               environment: {
                 PROVIDER_LEVEL_VAR: 'PROVIDER_LEVEL_VAR_VALUE',
                 NULL_VAR: null,
diff --git a/test/unit/lib/plugins/aws/package/compile/functions.test.js b/test/unit/lib/plugins/aws/package/compile/functions.test.js
index 8a34d194f..3804c679b 100644
--- a/test/unit/lib/plugins/aws/package/compile/functions.test.js
+++ b/test/unit/lib/plugins/aws/package/compile/functions.test.js
@@ -335,7 +335,7 @@ describe('AwsCompileFunctions', () => {
           Handler: 'func.function.handler',
           MemorySize: 1024,
           Role: { 'Fn::GetAtt': ['IamRoleLambdaExecution', 'Arn'] },
-          Runtime: 'nodejs18.x',
+          Runtime: 'nodejs20.x',
           Timeout: 6,
         },
       };
@@ -395,7 +395,7 @@ describe('AwsCompileFunctions', () => {
               Handler: 'func.function.handler',
               MemorySize: 1024,
               Role: { 'Fn::GetAtt': ['IamRoleLambdaExecution', 'Arn'] },
-              Runtime: 'nodejs18.x',
+              Runtime: 'nodejs20.x',
               Timeout: 6,
               DeadLetterConfig: {
                 TargetArn: 'arn:aws:sns:region:accountid:foo',
@@ -446,7 +446,7 @@ describe('AwsCompileFunctions', () => {
               Handler: 'func.function.handler',
               MemorySize: 1024,
               Role: { 'Fn::GetAtt': ['IamRoleLambdaExecution', 'Arn'] },
-              Runtime: 'nodejs18.x',
+              Runtime: 'nodejs20.x',
               Timeout: 6,
               DeadLetterConfig: {
                 TargetArn: {
@@ -488,7 +488,7 @@ describe('AwsCompileFunctions', () => {
               Handler: 'func.function.handler',
               MemorySize: 1024,
               Role: { 'Fn::GetAtt': ['IamRoleLambdaExecution', 'Arn'] },
-              Runtime: 'nodejs18.x',
+              Runtime: 'nodejs20.x',
               Timeout: 6,
               DeadLetterConfig: {
                 TargetArn: {
@@ -530,7 +530,7 @@ describe('AwsCompileFunctions', () => {
               Handler: 'func.function.handler',
               MemorySize: 1024,
               Role: { 'Fn::GetAtt': ['IamRoleLambdaExecution', 'Arn'] },
-              Runtime: 'nodejs18.x',
+              Runtime: 'nodejs20.x',
               Timeout: 6,
               DeadLetterConfig: {
                 TargetArn: {
@@ -572,7 +572,7 @@ describe('AwsCompileFunctions', () => {
               Handler: 'func.function.handler',
               MemorySize: 1024,
               Role: { 'Fn::GetAtt': ['IamRoleLambdaExecution', 'Arn'] },
-              Runtime: 'nodejs18.x',
+              Runtime: 'nodejs20.x',
               Timeout: 6,
               DeadLetterConfig: {
                 TargetArn: 'arn:aws:sns:region:accountid:foo',
@@ -639,7 +639,7 @@ describe('AwsCompileFunctions', () => {
               Handler: 'func.function.handler',
               MemorySize: 1024,
               Role: { 'Fn::GetAtt': ['IamRoleLambdaExecution', 'Arn'] },
-              Runtime: 'nodejs18.x',
+              Runtime: 'nodejs20.x',
               Timeout: 6,
               TracingConfig: {
                 Mode: 'Active',
@@ -696,7 +696,7 @@ describe('AwsCompileFunctions', () => {
           Handler: 'func.function.handler',
           MemorySize: 1024,
           Role: { 'Fn::GetAtt': ['IamRoleLambdaExecution', 'Arn'] },
-          Runtime: 'nodejs18.x',
+          Runtime: 'nodejs20.x',
           Timeout: 6,
           Environment: {
             Variables: {
@@ -763,7 +763,7 @@ describe('AwsCompileFunctions', () => {
           Handler: 'func.function.handler',
           MemorySize: 128,
           Role: { 'Fn::GetAtt': ['IamRoleLambdaExecution', 'Arn'] },
-          Runtime: 'nodejs18.x',
+          Runtime: 'nodejs20.x',
           Timeout: 10,
         },
       };
@@ -862,7 +862,7 @@ describe('AwsCompileFunctions', () => {
           MemorySize: 1024,
           ReservedConcurrentExecutions: 5,
           Role: { 'Fn::GetAtt': ['IamRoleLambdaExecution', 'Arn'] },
-          Runtime: 'nodejs18.x',
+          Runtime: 'nodejs20.x',
           Timeout: 6,
         },
       };
@@ -918,7 +918,7 @@ describe('AwsCompileFunctions', () => {
           MemorySize: 1024,
           ReservedConcurrentExecutions: 0,
           Role: { 'Fn::GetAtt': ['IamRoleLambdaExecution', 'Arn'] },
-          Runtime: 'nodejs18.x',
+          Runtime: 'nodejs20.x',
           Timeout: 6,
         },
       };
@@ -991,7 +991,7 @@ describe('AwsCompileFunctions', () => {
           Handler: 'func.function.handler',
           MemorySize: 1024,
           Role: { 'Fn::GetAtt': ['IamRoleLambdaExecution', 'Arn'] },
-          Runtime: 'nodejs18.x',
+          Runtime: 'nodejs20.x',
           Timeout: 6,
         },
       };
@@ -1029,7 +1029,7 @@ describe('AwsCompileFunctions', () => {
           Handler: 'func.function.handler',
           MemorySize: 1024,
           Role: { 'Fn::GetAtt': ['IamRoleLambdaExecution', 'Arn'] },
-          Runtime: 'nodejs18.x',
+          Runtime: 'nodejs20.x',
           Timeout: 6,
           Layers: ['arn:aws:xxx:*:*'],
         },
@@ -1116,7 +1116,7 @@ describe('lib/plugins/aws/package/compile/functions/index.test.js', () => {
               providerCfIfEnvVar: { 'Fn::If': ['cond', 'first', 'second'] },
             },
             memorySize: 4096,
-            runtime: 'nodejs18.x',
+            runtime: 'nodejs20.x',
             runtimeManagement: {
               mode: 'manual',
               arn: 'arn:aws:lambda:us-east-1:111111111111::runtime:7b620fc2e66107a1046b140b9d320295811af3ad5d4c6a011fad1fa65127e9e6I',
@@ -1139,7 +1139,7 @@ describe('lib/plugins/aws/package/compile/functions/index.test.js', () => {
                 sharedEnvVar: 'valueFromFunction',
               },
               memorySize: 2048,
-              runtime: 'nodejs18.x',
+              runtime: 'nodejs20.x',
               runtimeManagement: 'onFunctionUpdate',
               versionFunction: true,
             },
@@ -1743,7 +1743,7 @@ describe('lib/plugins/aws/package/compile/functions/index.test.js', () => {
               ExternalLambdaLayer: {
                 Type: 'AWS::Lambda::LayerVersion',
                 Properties: {
-                  CompatibleRuntimes: ['nodejs18.x'],
+                  CompatibleRuntimes: ['nodejs20.x'],
                   Content: {
                     S3Bucket: 'bucket',
                     S3Key: 'key',
@@ -1872,9 +1872,9 @@ describe('lib/plugins/aws/package/compile/functions/index.test.js', () => {
       // https://github.com/serverless/serverless/blob/d8527d8b57e7e5f0b94ba704d9f53adb34298d99/lib/plugins/aws/package/compile/functions/index.test.js#L1784-L1820
     });
 
-    it('should default to "nodejs18.x" runtime`', () => {
+    it('should default to "nodejs20.x" runtime`', () => {
       const funcResource = cfResources[naming.getLambdaLogicalId('target')];
-      expect(funcResource.Properties.Runtime).to.equal('nodejs18.x');
+      expect(funcResource.Properties.Runtime).to.equal('nodejs20.x');
     });
 
     it.skip('TODO: should support `functions[].runtime`', () => {
diff --git a/test/unit/lib/plugins/aws/package/compile/layers.test.js b/test/unit/lib/plugins/aws/package/compile/layers.test.js
index 2e9f7e6e7..d9fdceee5 100644
--- a/test/unit/lib/plugins/aws/package/compile/layers.test.js
+++ b/test/unit/lib/plugins/aws/package/compile/layers.test.js
@@ -48,7 +48,7 @@ describe('lib/plugins/aws/package/compile/layers/index.test.js', () => {
           layerTwo: {
             description: 'Layer two example',
             path: 'layer',
-            compatibleRuntimes: ['nodejs18.x'],
+            compatibleRuntimes: ['nodejs20.x'],
             compatibleArchitectures: ['arm64'],
             licenseInfo: 'GPL',
             allowedAccounts: ['123456789012', '123456789013'],
@@ -186,7 +186,7 @@ describe('lib/plugins/aws/package/compile/layers/index.test.js', () => {
     const layerOne = cfResources[layerResourceName];
 
     expect(layerOne.Type).to.equals('AWS::Lambda::LayerVersion');
-    expect(layerOne.Properties.CompatibleRuntimes).to.deep.equals(['nodejs18.x']);
+    expect(layerOne.Properties.CompatibleRuntimes).to.deep.equals(['nodejs20.x']);
   });
 
   it('should support `layers[].compatibleArchitectures`', () => {
diff --git a/test/unit/lib/plugins/aws/package/lib/strip-null-props-from-template-resources.test.js b/test/unit/lib/plugins/aws/package/lib/strip-null-props-from-template-resources.test.js
index 890f22cfc..0182f1026 100644
--- a/test/unit/lib/plugins/aws/package/lib/strip-null-props-from-template-resources.test.js
+++ b/test/unit/lib/plugins/aws/package/lib/strip-null-props-from-template-resources.test.js
@@ -43,7 +43,7 @@ describe('test/unit/lib/plugins/aws/package/lib/stripNullPropsFromTemplateResour
                 Code: {
                   S3Bucket: 's3-containing-lambda',
                 },
-                Runtime: 'nodejs18.x',
+                Runtime: 'nodejs20.x',
               },
             },
             resourceWithNullProperties: {