diff --git a/packages/@aws-cdk-testing/framework-integ/test/aws-lambda-event-sources/test/integ.s3.imported-bucket.js.snapshot/tester.template.json b/packages/@aws-cdk-testing/framework-integ/test/aws-lambda-event-sources/test/integ.s3.imported-bucket.js.snapshot/tester.template.json
index 8bad325aed1ad..2319fb188a3ba 100644
--- a/packages/@aws-cdk-testing/framework-integ/test/aws-lambda-event-sources/test/integ.s3.imported-bucket.js.snapshot/tester.template.json
+++ b/packages/@aws-cdk-testing/framework-integ/test/aws-lambda-event-sources/test/integ.s3.imported-bucket.js.snapshot/tester.template.json
@@ -178,7 +178,7 @@
       "Arn"
      ]
     },
-    "Runtime": "python3.9",
+    "Runtime": "python3.11",
     "Timeout": 300
    },
    "DependsOn": [
diff --git a/packages/@aws-cdk-testing/framework-integ/test/aws-lambda-event-sources/test/integ.s3.js.snapshot/lambda-event-source-s3.template.json b/packages/@aws-cdk-testing/framework-integ/test/aws-lambda-event-sources/test/integ.s3.js.snapshot/lambda-event-source-s3.template.json
index 04ce3c2d9e109..4391dd632d8a2 100644
--- a/packages/@aws-cdk-testing/framework-integ/test/aws-lambda-event-sources/test/integ.s3.js.snapshot/lambda-event-source-s3.template.json
+++ b/packages/@aws-cdk-testing/framework-integ/test/aws-lambda-event-sources/test/integ.s3.js.snapshot/lambda-event-source-s3.template.json
@@ -323,7 +323,7 @@
       "Arn"
      ]
     },
-    "Runtime": "python3.9",
+    "Runtime": "python3.11",
     "Timeout": 300
    },
    "DependsOn": [
diff --git a/packages/@aws-cdk-testing/framework-integ/test/aws-s3-notifications/test/integ.notifications.js.snapshot/test-3.template.json b/packages/@aws-cdk-testing/framework-integ/test/aws-s3-notifications/test/integ.notifications.js.snapshot/test-3.template.json
index fbc82f667ab39..a4c6c1474ee02 100644
--- a/packages/@aws-cdk-testing/framework-integ/test/aws-s3-notifications/test/integ.notifications.js.snapshot/test-3.template.json
+++ b/packages/@aws-cdk-testing/framework-integ/test/aws-s3-notifications/test/integ.notifications.js.snapshot/test-3.template.json
@@ -254,7 +254,7 @@
       "Arn"
      ]
     },
-    "Runtime": "python3.9",
+    "Runtime": "python3.11",
     "Timeout": 300
    },
    "DependsOn": [
diff --git a/packages/@aws-cdk-testing/framework-integ/test/aws-s3-notifications/test/lambda/integ.bucket-notifications.js.snapshot/cdk-integ-lambda-bucket-notifications.template.json b/packages/@aws-cdk-testing/framework-integ/test/aws-s3-notifications/test/lambda/integ.bucket-notifications.js.snapshot/cdk-integ-lambda-bucket-notifications.template.json
index d9c1a51e5e340..940d53e40c205 100644
--- a/packages/@aws-cdk-testing/framework-integ/test/aws-s3-notifications/test/lambda/integ.bucket-notifications.js.snapshot/cdk-integ-lambda-bucket-notifications.template.json
+++ b/packages/@aws-cdk-testing/framework-integ/test/aws-s3-notifications/test/lambda/integ.bucket-notifications.js.snapshot/cdk-integ-lambda-bucket-notifications.template.json
@@ -246,7 +246,7 @@
       "Arn"
      ]
     },
-    "Runtime": "python3.9",
+    "Runtime": "python3.11",
     "Timeout": 300
    },
    "DependsOn": [
diff --git a/packages/@aws-cdk-testing/framework-integ/test/aws-s3-notifications/test/sns/integ.sns-bucket-notifications.js.snapshot/sns-bucket-notifications.template.json b/packages/@aws-cdk-testing/framework-integ/test/aws-s3-notifications/test/sns/integ.sns-bucket-notifications.js.snapshot/sns-bucket-notifications.template.json
index aa1bbc1e9ff4c..ef290e6ef91de 100644
--- a/packages/@aws-cdk-testing/framework-integ/test/aws-s3-notifications/test/sns/integ.sns-bucket-notifications.js.snapshot/sns-bucket-notifications.template.json
+++ b/packages/@aws-cdk-testing/framework-integ/test/aws-s3-notifications/test/sns/integ.sns-bucket-notifications.js.snapshot/sns-bucket-notifications.template.json
@@ -204,7 +204,7 @@
       "Arn"
      ]
     },
-    "Runtime": "python3.9",
+    "Runtime": "python3.11",
     "Timeout": 300
    },
    "DependsOn": [
diff --git a/packages/@aws-cdk-testing/framework-integ/test/aws-s3-notifications/test/sqs/integ.bucket-notifications-unmanaged.js.snapshot/integ-sqs-bucket-notifications.template.json b/packages/@aws-cdk-testing/framework-integ/test/aws-s3-notifications/test/sqs/integ.bucket-notifications-unmanaged.js.snapshot/integ-sqs-bucket-notifications.template.json
index 0a89f897d98c2..4cf9e73a147f6 100644
--- a/packages/@aws-cdk-testing/framework-integ/test/aws-s3-notifications/test/sqs/integ.bucket-notifications-unmanaged.js.snapshot/integ-sqs-bucket-notifications.template.json
+++ b/packages/@aws-cdk-testing/framework-integ/test/aws-s3-notifications/test/sqs/integ.bucket-notifications-unmanaged.js.snapshot/integ-sqs-bucket-notifications.template.json
@@ -412,7 +412,7 @@
       "Arn"
      ]
     },
-    "Runtime": "python3.9",
+    "Runtime": "python3.11",
     "Timeout": 300
    },
    "DependsOn": [
diff --git a/packages/@aws-cdk-testing/framework-integ/test/aws-s3-notifications/test/sqs/integ.bucket-notifications.js.snapshot/sqs-bucket-notifications.template.json b/packages/@aws-cdk-testing/framework-integ/test/aws-s3-notifications/test/sqs/integ.bucket-notifications.js.snapshot/sqs-bucket-notifications.template.json
index 5054faf3f9eda..27d4054b8d193 100644
--- a/packages/@aws-cdk-testing/framework-integ/test/aws-s3-notifications/test/sqs/integ.bucket-notifications.js.snapshot/sqs-bucket-notifications.template.json
+++ b/packages/@aws-cdk-testing/framework-integ/test/aws-s3-notifications/test/sqs/integ.bucket-notifications.js.snapshot/sqs-bucket-notifications.template.json
@@ -193,7 +193,7 @@
       "Arn"
      ]
     },
-    "Runtime": "python3.9",
+    "Runtime": "python3.11",
     "Timeout": 300
    },
    "DependsOn": [
diff --git a/packages/@aws-cdk-testing/framework-integ/test/aws-s3/test/integ.bucket.notifications.js.snapshot/aws-cdk-s3-notifications.template.json b/packages/@aws-cdk-testing/framework-integ/test/aws-s3/test/integ.bucket.notifications.js.snapshot/aws-cdk-s3-notifications.template.json
index a8da931afe76f..8a13892087d2d 100644
--- a/packages/@aws-cdk-testing/framework-integ/test/aws-s3/test/integ.bucket.notifications.js.snapshot/aws-cdk-s3-notifications.template.json
+++ b/packages/@aws-cdk-testing/framework-integ/test/aws-s3/test/integ.bucket.notifications.js.snapshot/aws-cdk-s3-notifications.template.json
@@ -89,7 +89,7 @@
       "Arn"
      ]
     },
-    "Runtime": "python3.9",
+    "Runtime": "python3.11",
     "Timeout": 300
    },
    "DependsOn": [
diff --git a/packages/aws-cdk-lib/aws-s3/lib/notifications-resource/notifications-resource-handler.ts b/packages/aws-cdk-lib/aws-s3/lib/notifications-resource/notifications-resource-handler.ts
index 9c969b8b06bca..4c4968f1558ec 100644
--- a/packages/aws-cdk-lib/aws-s3/lib/notifications-resource/notifications-resource-handler.ts
+++ b/packages/aws-cdk-lib/aws-s3/lib/notifications-resource/notifications-resource-handler.ts
@@ -98,7 +98,7 @@ export class NotificationsResourceHandler extends Construct {
         Code: { ZipFile: handlerSourceWithoutComments },
         Handler: 'index.handler',
         Role: this.role.roleArn,
-        Runtime: 'python3.9',
+        Runtime: 'python3.11',
         Timeout: 300,
       },
     });
diff --git a/packages/aws-cdk-lib/aws-s3/test/notification.test.ts b/packages/aws-cdk-lib/aws-s3/test/notification.test.ts
index 225fb4a6991f7..fb5b037d74c1d 100644
--- a/packages/aws-cdk-lib/aws-s3/test/notification.test.ts
+++ b/packages/aws-cdk-lib/aws-s3/test/notification.test.ts
@@ -182,7 +182,7 @@ describe('notification', () => {
     });
 
     Template.fromStack(stack).hasResourceProperties('AWS::Lambda::Function', {
-      Runtime: 'python3.9',
+      Runtime: 'python3.11',
     });
   });
 });