diff --git a/.github/FUNDING.yml b/.github/FUNDING.yml
index 7f39679..ccc0b43 100644
--- a/.github/FUNDING.yml
+++ b/.github/FUNDING.yml
@@ -1,3 +1,4 @@
+github: floydspace
 patreon: floydspace
 issuehunt: floydspace
 ko_fi: floydspace
diff --git a/package.json b/package.json
index 127dfff..cb7c49a 100644
--- a/package.json
+++ b/package.json
@@ -44,9 +44,9 @@
     "typescript"
   ],
   "devDependencies": {
-    "@aws-cdk/assert": "^1.70.0",
-    "@aws-cdk/aws-lambda": "^1.70.0",
-    "@aws-cdk/core": "^1.70.0",
+    "@aws-cdk/assert": "^1.114.0",
+    "@aws-cdk/aws-lambda": "^1.114.0",
+    "@aws-cdk/core": "^1.114.0",
     "@commitlint/cli": "^11.0.0",
     "@commitlint/config-conventional": "^11.0.0",
     "@types/fs-extra": "^9.0.2",
diff --git a/src/function.ts b/src/function.ts
index c5e9b67..f6963b6 100644
--- a/src/function.ts
+++ b/src/function.ts
@@ -6,12 +6,23 @@ import { mergeRight, union, without } from 'ramda';
 
 import { packExternalModules } from './pack-externals';
 import { NodejsFunctionProps } from './props';
-import { extractFileName, findProjectRoot, NodeMajorESMap, nodeMajorVersion } from './utils';
+import { extractFileName, findProjectRoot, nodeMajorVersion } from './utils';
 
 const BUILD_FOLDER = '.build';
 const DEFAULT_BUILD_OPTIONS: es.BuildOptions = {
   bundle: true,
-  target: NodeMajorESMap[nodeMajorVersion()],
+  target: `node${nodeMajorVersion()}`,
+};
+
+const NodeMajorMap = {
+  8: lambda.Runtime.NODEJS_8_10,
+  9: lambda.Runtime.NODEJS_8_10,
+  10: lambda.Runtime.NODEJS_10_X,
+  11: lambda.Runtime.NODEJS_10_X,
+  12: lambda.Runtime.NODEJS_12_X,
+  13: lambda.Runtime.NODEJS_12_X,
+  14: lambda.Runtime.NODEJS_14_X,
+  15: lambda.Runtime.NODEJS_14_X,
 };
 
 /**
@@ -33,9 +44,7 @@ export class NodejsFunction extends lambda.Function {
     const exclude = props.exclude ?? ['aws-sdk'];
     const packager = props.packager ?? true;
     const handler = props.handler ?? 'index.handler';
-    const defaultRuntime = nodeMajorVersion() >= 12
-      ? lambda.Runtime.NODEJS_12_X
-      : lambda.Runtime.NODEJS_10_X;
+    const defaultRuntime = NodeMajorMap[nodeMajorVersion()];
     const runtime = props.runtime ?? defaultRuntime;
     const entry = extractFileName(projectRoot, handler);
 
@@ -52,7 +61,7 @@ export class NodejsFunction extends lambda.Function {
         without(exclude, buildOptions.external || []),
         projectRoot,
         path.join(projectRoot, BUILD_FOLDER),
-        packager !== true ? packager : undefined,
+        packager !== true ? packager : undefined
       );
     }
 
diff --git a/src/utils.ts b/src/utils.ts
index 0bbf451..5cbba91 100644
--- a/src/utils.ts
+++ b/src/utils.ts
@@ -91,11 +91,9 @@ export function findUp(name: string, directory: string = process.cwd()): string
  * Forwards `rootDir` or finds project root folder.
  */
 export function findProjectRoot(rootDir?: string): string | undefined {
-  return rootDir
-    ?? findUp('yarn.lock')
-    ?? findUp('package-lock.json')
-    ?? findUp('package.json')
-    ?? findUp(`.git${path.sep}`);
+  return (
+    rootDir ?? findUp('yarn.lock') ?? findUp('package-lock.json') ?? findUp('package.json') ?? findUp(`.git${path.sep}`)
+  );
 }
 
 /**
@@ -105,18 +103,6 @@ export function nodeMajorVersion(): number {
   return parseInt(process.versions.node.split('.')[0], 10);
 }
 
-export const NodeMajorESMap = {
-  8: 'es2016',
-  9: 'es2017',
-  10: 'es2018',
-  11: 'es2018',
-  12: 'es2019',
-  13: 'es2019',
-  14: 'es2020',
-  15: 'es2020',
-  16: 'esnext',
-};
-
 /**
  * Returns the package manager currently active if the program is executed
  * through an npm or yarn script like: