diff --git a/package-lock.json b/package-lock.json
index 2d70b44..1d0cc50 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1076,9 +1076,9 @@
       "dev": true
     },
     "typescript": {
-      "version": "3.9.3",
-      "resolved": "https://registry.npmjs.org/typescript/-/typescript-3.9.3.tgz",
-      "integrity": "sha512-D/wqnB2xzNFIcoBG9FG8cXRDjiqSTbG2wd8DMZeQyJlP1vfTkIxH4GKveWaEBYySKIg+USu+E+EDIR47SqnaMQ==",
+      "version": "4.3.5",
+      "resolved": "https://registry.npmjs.org/typescript/-/typescript-4.3.5.tgz",
+      "integrity": "sha512-DqQgihaQ9cUrskJo9kIyW/+g0Vxsk8cDtZ52a3NGh0YNTfpUSArXSohyUGnvbPazEPLu398C0UxmKSOrPumUzA==",
       "dev": true
     },
     "util-deprecate": {
diff --git a/package.json b/package.json
index dd8cb81..b0e2078 100644
--- a/package.json
+++ b/package.json
@@ -44,7 +44,7 @@
     "rxjs": "^6.5.4",
     "tap-xunit": "^2.2.0",
     "tslint": "^6.0.0",
-    "typescript": "^3.7.2"
+    "typescript": "^4.3.5"
   },
   "peerDependencies": {
     "rxjs": "6.x"