diff --git a/packages/@aws-cdk/aws-lambda-event-sources/test/integ.s3.expected.json b/packages/@aws-cdk/aws-lambda-event-sources/test/integ.s3.expected.json
index e4b5d64e2d04e..96f5a3e6a63d7 100644
--- a/packages/@aws-cdk/aws-lambda-event-sources/test/integ.s3.expected.json
+++ b/packages/@aws-cdk/aws-lambda-event-sources/test/integ.s3.expected.json
@@ -185,7 +185,7 @@
             "Arn"
           ]
         },
-        "Runtime": "nodejs14.x",
+        "Runtime": "nodejs12.x",
         "Timeout": 300
       },
       "DependsOn": [
diff --git a/packages/@aws-cdk/aws-s3-notifications/test/integ.notifications.expected.json b/packages/@aws-cdk/aws-s3-notifications/test/integ.notifications.expected.json
index f0babb81fc0a6..f8b1a350486f9 100644
--- a/packages/@aws-cdk/aws-s3-notifications/test/integ.notifications.expected.json
+++ b/packages/@aws-cdk/aws-s3-notifications/test/integ.notifications.expected.json
@@ -220,7 +220,7 @@
             "Arn"
           ]
         },
-        "Runtime": "nodejs14.x",
+        "Runtime": "nodejs12.x",
         "Timeout": 300
       },
       "DependsOn": [
diff --git a/packages/@aws-cdk/aws-s3-notifications/test/lambda/integ.bucket-notifications.expected.json b/packages/@aws-cdk/aws-s3-notifications/test/lambda/integ.bucket-notifications.expected.json
index 918c4a9d09334..8eb330f53a91e 100644
--- a/packages/@aws-cdk/aws-s3-notifications/test/lambda/integ.bucket-notifications.expected.json
+++ b/packages/@aws-cdk/aws-s3-notifications/test/lambda/integ.bucket-notifications.expected.json
@@ -244,7 +244,7 @@
             "Arn"
           ]
         },
-        "Runtime": "nodejs14.x",
+        "Runtime": "nodejs12.x",
         "Timeout": 300
       },
       "DependsOn": [
diff --git a/packages/@aws-cdk/aws-s3-notifications/test/sns/integ.sns-bucket-notifications.expected.json b/packages/@aws-cdk/aws-s3-notifications/test/sns/integ.sns-bucket-notifications.expected.json
index ecdd9d831e74f..2cd8f17706a09 100644
--- a/packages/@aws-cdk/aws-s3-notifications/test/sns/integ.sns-bucket-notifications.expected.json
+++ b/packages/@aws-cdk/aws-s3-notifications/test/sns/integ.sns-bucket-notifications.expected.json
@@ -203,7 +203,7 @@
             "Arn"
           ]
         },
-        "Runtime": "nodejs14.x",
+        "Runtime": "nodejs12.x",
         "Timeout": 300
       },
       "DependsOn": [
diff --git a/packages/@aws-cdk/aws-s3-notifications/test/sqs/integ.bucket-notifications.expected.json b/packages/@aws-cdk/aws-s3-notifications/test/sqs/integ.bucket-notifications.expected.json
index ea40221e82f15..0e8a6a56cfb6e 100644
--- a/packages/@aws-cdk/aws-s3-notifications/test/sqs/integ.bucket-notifications.expected.json
+++ b/packages/@aws-cdk/aws-s3-notifications/test/sqs/integ.bucket-notifications.expected.json
@@ -192,7 +192,7 @@
             "Arn"
           ]
         },
-        "Runtime": "nodejs14.x",
+        "Runtime": "nodejs12.x",
         "Timeout": 300
       },
       "DependsOn": [
diff --git a/packages/@aws-cdk/aws-s3/lib/notifications-resource/notifications-resource-handler.ts b/packages/@aws-cdk/aws-s3/lib/notifications-resource/notifications-resource-handler.ts
index 8a47247be1b1e..b013bc0ebd5b8 100644
--- a/packages/@aws-cdk/aws-s3/lib/notifications-resource/notifications-resource-handler.ts
+++ b/packages/@aws-cdk/aws-s3/lib/notifications-resource/notifications-resource-handler.ts
@@ -82,7 +82,7 @@ export class NotificationsResourceHandler extends Construct {
         Code: { ZipFile: `exports.handler = ${handler.toString()};` },
         Handler: 'index.handler',
         Role: role.roleArn,
-        Runtime: 'nodejs14.x',
+        Runtime: 'nodejs12.x',
         Timeout: 300,
       },
     });