diff --git a/typescript/api-gateway-lambda-token-authorizer/lib/lambdas/authorizer/index.ts b/typescript/api-gateway-lambda-token-authorizer/lib/lambdas/authorizer/index.ts
index 85d00c3adf..6d709c6c5a 100644
--- a/typescript/api-gateway-lambda-token-authorizer/lib/lambdas/authorizer/index.ts
+++ b/typescript/api-gateway-lambda-token-authorizer/lib/lambdas/authorizer/index.ts
@@ -1,7 +1,7 @@
 import { Context, APIGatewayTokenAuthorizerEvent, Callback } from "aws-lambda";
 
 export const handler = function (event: APIGatewayTokenAuthorizerEvent, context: Context, callback: Callback) {
-    var token = event.authorizationToken;
+    let token = event.authorizationToken;
     switch (token) {
         case 'allow':
             callback(null, generatePolicy('user', 'Allow', event.methodArn));
@@ -17,7 +17,7 @@ export const handler = function (event: APIGatewayTokenAuthorizerEvent, context:
     }
 };
 
-var generatePolicy = function (principalId: string, effect: string, resource: string) {
+let generatePolicy = function (principalId: string, effect: string, resource: string) {
     return {
         principalId: principalId,
         policyDocument: {
diff --git a/typescript/api-gateway-lambda-token-authorizer/test/stack/__snapshots__/gateway-lambda-auth-stack.test.ts.snap b/typescript/api-gateway-lambda-token-authorizer/test/stack/__snapshots__/gateway-lambda-auth-stack.test.ts.snap
index b9c251e70e..df86865987 100644
--- a/typescript/api-gateway-lambda-token-authorizer/test/stack/__snapshots__/gateway-lambda-auth-stack.test.ts.snap
+++ b/typescript/api-gateway-lambda-token-authorizer/test/stack/__snapshots__/gateway-lambda-auth-stack.test.ts.snap
@@ -190,7 +190,7 @@ exports[`Snapshot Stack 1`] = `
           "S3Bucket": {
             "Fn::Sub": "cdk-hnb659fds-assets-\${AWS::AccountId}-\${AWS::Region}",
           },
-          "S3Key": "a89b0c25113046ece0e7fb82e6d729811e22e9ed30e0d44feb9ffa39ef67b8a4.zip",
+          "S3Key": "a1deff17a695906f93c544b1deae2bf444210622f05330da961687eb8f4a51a7.zip",
         },
         "Description": "Lambda Authorizer",
         "Environment": {
diff --git a/typescript/lambda-api-ci/src/handler.ts b/typescript/lambda-api-ci/src/handler.ts
index 88bd9393c9..54ecc458cf 100644
--- a/typescript/lambda-api-ci/src/handler.ts
+++ b/typescript/lambda-api-ci/src/handler.ts
@@ -7,12 +7,12 @@ const handler = async function (event: any, context: any) {
     const S3Client = new S3()
 
     try {
-        var method = event.httpMethod
+        let method = event.httpMethod
 
         if (method === "GET") {
             if (event.path === "/") {
                 const data = await S3Client.listObjectsV2({ Bucket: bucketName })
-                var body = {
+                let body = {
                     widgets: data.Contents!.map(function (e) {
                         return e.Key
                     }),
diff --git a/typescript/neptune-with-vpc/neptune-with-vpc-stack.ts b/typescript/neptune-with-vpc/neptune-with-vpc-stack.ts
index 6971d3a5ee..7313d20ef4 100644
--- a/typescript/neptune-with-vpc/neptune-with-vpc-stack.ts
+++ b/typescript/neptune-with-vpc/neptune-with-vpc-stack.ts
@@ -41,9 +41,9 @@ export class NeptuneWithVpcStack extends cdk.Stack {
     });
 
     // Get lists of Subnets by type
-    var neptunePublicSubnets = neptuneVpc.publicSubnets;
-    var neptunePrivateSubnets = neptuneVpc.privateSubnets;
-    var neptuneIsolatedSubnets = neptuneVpc.isolatedSubnets;
+    let neptunePublicSubnets = neptuneVpc.publicSubnets;
+    let neptunePrivateSubnets = neptuneVpc.privateSubnets;
+    let neptuneIsolatedSubnets = neptuneVpc.isolatedSubnets;
 
     // Create Subnet group list to be used with Neptune.
     const neptuneSubnets: ec2.SubnetSelection = { subnets: neptuneIsolatedSubnets };
diff --git a/typescript/rds/aurora/aurora.ts b/typescript/rds/aurora/aurora.ts
index dc465827ec..9fab0d4ae3 100644
--- a/typescript/rds/aurora/aurora.ts
+++ b/typescript/rds/aurora/aurora.ts
@@ -144,7 +144,7 @@ export class Aurora extends Stack {
     let replicaInstances = props.replicaInstances ?? 1;
     let backupRetentionDays = props.backupRetentionDays ?? 14;
 
-    var ingressSources = [];
+    let ingressSources = [];
     if (typeof props.ingressSources !== 'undefined') {
       ingressSources = props.ingressSources;
     }
diff --git a/typescript/rds/aurora/package.json b/typescript/rds/aurora/package.json
index 65f7bdbabb..a857a1ff31 100644
--- a/typescript/rds/aurora/package.json
+++ b/typescript/rds/aurora/package.json
@@ -10,17 +10,17 @@
     "cdk": "cdk"
   },
   "devDependencies": {
-    "@types/jest": "^26.0.10",
+    "@types/jest": "^29.5.13",
     "@types/node": "*",
-    "jest": "^26.4.2",
+    "jest": "^29.7.0",
     "aws-cdk": "*",
-    "ts-jest": "^26.2.0",
-    "ts-node": "^10.9.1",
-    "typescript": "~5.1.6"
+    "ts-jest": "^29.2.5",
+    "ts-node": "^10.9.2",
+    "typescript": "~5.6.2"
   },
   "dependencies": {
-    "aws-cdk-lib": "^2.0.0",
-    "constructs": "^10.0.0",
-    "source-map-support": "^0.5.16"
+    "aws-cdk-lib": "^2.158.0",
+    "constructs": "^10.3.0",
+    "source-map-support": "^0.5.21"
   }
 }
diff --git a/typescript/rds/mysql/package.json b/typescript/rds/mysql/package.json
index 34cf8397f2..c4c9e6d770 100644
--- a/typescript/rds/mysql/package.json
+++ b/typescript/rds/mysql/package.json
@@ -10,18 +10,18 @@
     "cdk": "cdk"
   },
   "devDependencies": {
-    "@types/jest": "^26.0.10",
+    "@types/jest": "^29.5.13",
     "@types/node": "*",
-    "jest": "29.6.4",
-    "ts-jest": "29.2.4",
-    "ts-node": "^10.9.1",
+    "jest": "29.7.0",
+    "ts-jest": "29.2.5",
+    "ts-node": "^10.9.2",
     "aws-cdk": "*",
-    "typescript": "~5.1.6"
+    "typescript": "~5.6.2"
   },
   "esModuleInterop": true,
   "dependencies": {
-    "aws-cdk-lib": "^2.0.0",
-    "constructs": "^10.0.0",
-    "source-map-support": "^0.5.16"
+    "aws-cdk-lib": "^2.158.0",
+    "constructs": "^10.3.0",
+    "source-map-support": "^0.5.21"
   }
-}
\ No newline at end of file
+}
diff --git a/typescript/rds/oracle/oracle.ts b/typescript/rds/oracle/oracle.ts
index b09947b0ec..722882e12e 100644
--- a/typescript/rds/oracle/oracle.ts
+++ b/typescript/rds/oracle/oracle.ts
@@ -103,15 +103,15 @@ export class Oracle extends Stack {
     super(scope, id);
 
     // default database username
-    var oracleUsername = "dbadmin";
+    let oracleUsername = "dbadmin";
     if (typeof props.oracleUsername !== 'undefined') {
       oracleUsername = "dbadmin";
     }
-    var ingressSources = [];
+    let ingressSources = [];
     if (typeof props.ingressSources !== 'undefined') {
       ingressSources = props.ingressSources;
     }
-    var engineVersion = rds.OracleEngineVersion.VER_19_0_0_0_2021_04_R1;
+    let engineVersion = rds.OracleEngineVersion.VER_19_0_0_0_2021_04_R1;
     if (typeof props.engineVersion !== 'undefined') {
       engineVersion = props.engineVersion;
     }
diff --git a/typescript/rds/oracle/package.json b/typescript/rds/oracle/package.json
index 4dd3f29b95..332e905643 100644
--- a/typescript/rds/oracle/package.json
+++ b/typescript/rds/oracle/package.json
@@ -10,17 +10,17 @@
     "cdk": "cdk"
   },
   "devDependencies": {
-    "@types/jest": "^26.0.10",
+    "@types/jest": "^29.5.13",
     "@types/node": "*",
-    "jest": "^26.4.2",
+    "jest": "^29.7.0",
     "aws-cdk": "*",
-    "ts-jest": "^26.2.0",
-    "ts-node": "^10.9.1",
-    "typescript": "~5.1.6"
+    "ts-jest": "^29.2.5",
+    "ts-node": "^10.9.2",
+    "typescript": "~5.6.2"
   },
   "dependencies": {
-    "aws-cdk-lib": "^2.0.0",
-    "constructs": "^10.0.0",
-    "source-map-support": "^0.5.16"
+    "aws-cdk-lib": "^2.158.0",
+    "constructs": "^10.3.0",
+    "source-map-support": "^0.5.21"
   }
 }
diff --git a/typescript/waf/waf-cloudfront.ts b/typescript/waf/waf-cloudfront.ts
index 51589f9b3b..6bb42f69ba 100644
--- a/typescript/waf/waf-cloudfront.ts
+++ b/typescript/waf/waf-cloudfront.ts
@@ -17,23 +17,23 @@ export class WafCloudFrontStack extends cdk.Stack {
    * Create output for use in WAF config
    */
   protected makeRules(listOfRules: listOfRules[] = []) {
-    var rules: wafv2.CfnRuleGroup.RuleProperty[] = [];
+    let rules: wafv2.CfnRuleGroup.RuleProperty[] = [];
     listOfRules.forEach(function (r) {
-      var mrgsp: wafv2.CfnWebACL.ManagedRuleGroupStatementProperty = {
+      let mrgsp: wafv2.CfnWebACL.ManagedRuleGroupStatementProperty = {
         name: r['name'],
         vendorName: "AWS",
         excludedRules: []
       };
 
-      var stateProp: wafv2.CfnWebACL.StatementProperty = {
+      let stateProp: wafv2.CfnWebACL.StatementProperty = {
         managedRuleGroupStatement: {
           name: r['name'],
           vendorName: "AWS",
         }
       };
-      var overrideAction: wafv2.CfnWebACL.OverrideActionProperty = { none: {} }
+      let overrideAction: wafv2.CfnWebACL.OverrideActionProperty = { none: {} }
 
-      var rule: wafv2.CfnWebACL.RuleProperty = {
+      let rule: wafv2.CfnWebACL.RuleProperty = {
         name: r['name'],
         priority: r['priority'],
         overrideAction: overrideAction,
@@ -48,7 +48,7 @@ export class WafCloudFrontStack extends cdk.Stack {
     }); // forEach
 
     // Allowed country list
-    var ruleGeoMatch: wafv2.CfnWebACL.RuleProperty = {
+    let ruleGeoMatch: wafv2.CfnWebACL.RuleProperty = {
       name: 'GeoMatch',
       priority: 0,
       action: {
@@ -95,7 +95,7 @@ export class WafCloudFrontStack extends cdk.Stack {
      * and requests will be blocked once this limit is reached.
      * The IP address is automatically unblocked after it falls below the limit.
      */
-    var ruleLimitRequests100: wafv2.CfnWebACL.RuleProperty = {
+    let ruleLimitRequests100: wafv2.CfnWebACL.RuleProperty = {
       name: 'LimitRequests100',
       priority: 1,
       action: {
diff --git a/typescript/waf/waf-regional.ts b/typescript/waf/waf-regional.ts
index b3181b8901..56aa0ab4ec 100644
--- a/typescript/waf/waf-regional.ts
+++ b/typescript/waf/waf-regional.ts
@@ -17,18 +17,18 @@ export class WafRegionalStack extends cdk.Stack {
    * Create output for use in WAF config
    */
   protected makeRules(listOfRules: listOfRules[] = []) {
-    var rules: wafv2.CfnRuleGroup.RuleProperty[] = [];
+    let rules: wafv2.CfnRuleGroup.RuleProperty[] = [];
 
     for (const r of listOfRules) {
-      var stateProp: wafv2.CfnWebACL.StatementProperty = {
+      let stateProp: wafv2.CfnWebACL.StatementProperty = {
         managedRuleGroupStatement: {
           name: r['name'],
           vendorName: "AWS",
         }
       };
-      var overrideAction: wafv2.CfnWebACL.OverrideActionProperty = { none: {} }
+      let overrideAction: wafv2.CfnWebACL.OverrideActionProperty = { none: {} }
 
-      var rule: wafv2.CfnRuleGroup.RuleProperty = {
+      let rule: wafv2.CfnRuleGroup.RuleProperty = {
         name: r['name'],
         priority: r['priority'],
         // @ts-expect-error Property 'overrideAction' does not exist on type 'CfnRuleGroup.RuleProperty'
@@ -44,7 +44,7 @@ export class WafRegionalStack extends cdk.Stack {
     };
 
     // Allowed country list
-    var ruleGeoMatch: wafv2.CfnWebACL.RuleProperty = {
+    let ruleGeoMatch: wafv2.CfnWebACL.RuleProperty = {
       name: 'GeoMatch',
       priority: 0,
       action: {
@@ -91,7 +91,7 @@ export class WafRegionalStack extends cdk.Stack {
      * and requests will be blocked once this limit is reached.
      * The IP address is automatically unblocked after it falls below the limit.
      */
-    var ruleLimitRequests100: wafv2.CfnWebACL.RuleProperty = {
+    let ruleLimitRequests100: wafv2.CfnWebACL.RuleProperty = {
       name: 'LimitRequests100',
       priority: 1,
       action: {