diff --git a/package.json b/package.json
index 96db56e..2a3cfe1 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@cribadvisor/aws-param-cache",
-  "version": "2.0.0",
+  "version": "2.1.0",
   "description": "Cache un/encrypted expiring values as AWS SSM parameters with a TTL",
   "main": "dist/index.js",
   "types": "dist",
diff --git a/tsconfig.json b/tsconfig.json
index 6f346c2..34634bb 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -1,6 +1,6 @@
 {
   "compilerOptions": {
-    "target": "es5",
+    "target": "es6",
     "module": "commonjs",
     "strict": true,
     "esModuleInterop": true,
@@ -9,5 +9,7 @@
     "rootDir": "src",
     "outDir": "dist",
     "declaration": true,
+    "strictNullChecks": true,
+    "strictPropertyInitialization": true
   },
 }