diff --git a/packages/@aws-cdk/aws-synthetics/README.md b/packages/@aws-cdk/aws-synthetics/README.md
index ba0482d3aa263..7f7665e02238c 100644
--- a/packages/@aws-cdk/aws-synthetics/README.md
+++ b/packages/@aws-cdk/aws-synthetics/README.md
@@ -127,7 +127,7 @@ new synthetics.Canary(this, 'Inline Canary', {
     code: synthetics.Code.fromInline('/* Synthetics handler code */'),
     handler: 'index.handler', // must be 'index.handler'
   }),
-  runtime: synthetics.Runtime.SYNTHETICS_NODEJS_PUPPETEER_3_1,
+  runtime: synthetics.Runtime.SYNTHETICS_NODEJS_PUPPETEER_3_3,
 });
 
 // To supply the code from your local filesystem:
@@ -136,7 +136,7 @@ new synthetics.Canary(this, 'Asset Canary', {
     code: synthetics.Code.fromAsset(path.join(__dirname, 'canary')),
     handler: 'index.handler', // must end with '.handler'
   }),
-  runtime: synthetics.Runtime.SYNTHETICS_NODEJS_PUPPETEER_3_1,
+  runtime: synthetics.Runtime.SYNTHETICS_NODEJS_PUPPETEER_3_3,
 });
 
 // To supply the code from a S3 bucket:
@@ -147,7 +147,7 @@ new synthetics.Canary(this, 'Bucket Canary', {
     code: synthetics.Code.fromBucket(bucket, 'canary.zip'),
     handler: 'index.handler', // must end with '.handler'
   }),
-  runtime: synthetics.Runtime.SYNTHETICS_NODEJS_PUPPETEER_3_1,
+  runtime: synthetics.Runtime.SYNTHETICS_NODEJS_PUPPETEER_3_3,
 });
 ```