diff --git a/package.json b/package.json
index c536e9c..d973537 100644
--- a/package.json
+++ b/package.json
@@ -27,7 +27,7 @@
     "ts-jest": "^22.4.2",
     "ts-node": "^4.1.0",
     "tslint": "^5.8.0",
-    "typescript": "^2.9.2"
+    "typescript": "^3.1.1"
   },
   "engines": {
     "node": ">= 8.0.0",
diff --git a/packages/typewiz-core/package.json b/packages/typewiz-core/package.json
index 75ecf8f..0efeced 100644
--- a/packages/typewiz-core/package.json
+++ b/packages/typewiz-core/package.json
@@ -16,7 +16,7 @@
   ],
   "dependencies": {
     "ajv": "^6.4.0",
-    "typescript": "^2.4.2"
+    "typescript": ">=2.4.2 <4.0.0"
   },
   "engines": {
     "node": ">= 8.0.0"
diff --git a/yarn.lock b/yarn.lock
index e2621af..4ce859c 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -5545,10 +5545,10 @@ typedarray@^0.0.6:
   resolved "https://registry.yarnpkg.com/typedarray/-/typedarray-0.0.6.tgz#867ac74e3864187b1d3d47d996a78ec5c8830777"
   integrity sha1-hnrHTjhkGHsdPUfZlqeOxciDB3c=
 
-typescript@^2.4.2, typescript@^2.9.2:
-  version "2.9.2"
-  resolved "https://registry.yarnpkg.com/typescript/-/typescript-2.9.2.tgz#1cbf61d05d6b96269244eb6a3bce4bd914e0f00c"
-  integrity sha512-Gr4p6nFNaoufRIY4NMdpQRNmgxVIGMs4Fcu/ujdYk3nAZqk7supzBE9idmvfZIlH/Cuj//dvi+019qEue9lV0w==
+"typescript@>=2.4.2 <4.0.0", typescript@^3.1.1:
+  version "3.1.1"
+  resolved "https://registry.yarnpkg.com/typescript/-/typescript-3.1.1.tgz#3362ba9dd1e482ebb2355b02dfe8bcd19a2c7c96"
+  integrity sha512-Veu0w4dTc/9wlWNf2jeRInNodKlcdLgemvPsrNpfu5Pq39sgfFjvIIgTsvUHCoLBnMhPoUA+tFxsXjU6VexVRQ==
 
 uglify-js@^2.6:
   version "2.8.29"