diff --git a/build/package.json b/build/package.json
index 7561ebc958c..9d86dbaf79e 100644
--- a/build/package.json
+++ b/build/package.json
@@ -45,7 +45,7 @@
     "minimist": "^1.2.3",
     "request": "^2.85.0",
     "terser": "4.3.8",
-    "typescript": "^4.1.0-dev.20200924",
+    "typescript": "^4.1.0-dev.20201018",
     "vsce": "1.48.0",
     "vscode-telemetry-extractor": "^1.6.0",
     "xml2js": "^0.4.17"
diff --git a/build/yarn.lock b/build/yarn.lock
index 3cc284f20dc..09186eb00b0 100644
--- a/build/yarn.lock
+++ b/build/yarn.lock
@@ -2535,10 +2535,10 @@ typescript@^3.0.1:
   resolved "https://registry.yarnpkg.com/typescript/-/typescript-3.5.3.tgz#c830f657f93f1ea846819e929092f5fe5983e977"
   integrity sha512-ACzBtm/PhXBDId6a6sDJfroT2pOWt/oOnk4/dElG5G33ZL776N3Y6/6bKZJBFpd+b05F3Ct9qDjMeJmRWtE2/g==
 
-typescript@^4.1.0-dev.20200924:
-  version "4.1.0-dev.20200924"
-  resolved "https://registry.yarnpkg.com/typescript/-/typescript-4.1.0-dev.20200924.tgz#d8b2aaa6f94ec22725eafcadf0b9a17aae9c32b9"
-  integrity sha512-AXwqVrp2AeVZ3jaZ/gcvxb0nnvqEbDFuFFjvV5/9wfcyz7KZx5KvyJENUgGoJHywCvl1PHKasQKYjzjk1QixnQ==
+typescript@^4.1.0-dev.20201018:
+  version "4.1.0-dev.20201018"
+  resolved "https://registry.yarnpkg.com/typescript/-/typescript-4.1.0-dev.20201018.tgz#1a4b8e3f9b640218a44299773371354d75bcfa34"
+  integrity sha512-cOFYP1I+IrMWa6ZfefxcacZha1pQMxrq8DGMBLkvrl8k3CqIdD8APq9LXaMj/PWrB8IPgDprY6jHwqiHg0/oGA==
 
 typical@^4.0.0:
   version "4.0.0"
diff --git a/package.json b/package.json
index bda7354c003..eaef8f06d68 100644
--- a/package.json
+++ b/package.json
@@ -168,7 +168,7 @@
     "style-loader": "^1.0.0",
     "ts-loader": "^4.4.2",
     "tsec": "googleinterns/tsec",
-    "typescript": "^4.1.0-dev.20200924",
+    "typescript": "^4.1.0-dev.20201018",
     "typescript-formatter": "7.1.0",
     "underscore": "^1.8.2",
     "vinyl": "^2.0.0",
diff --git a/yarn.lock b/yarn.lock
index b59bc29d438..6bbc9a10963 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -9296,10 +9296,10 @@ typescript@^2.6.2:
   resolved "https://registry.yarnpkg.com/typescript/-/typescript-2.6.2.tgz#3c5b6fd7f6de0914269027f03c0946758f7673a4"
   integrity sha1-PFtv1/beCRQmkCfwPAlGdY92c6Q=
 
-typescript@^4.1.0-dev.20200924:
-  version "4.1.0-dev.20200924"
-  resolved "https://registry.yarnpkg.com/typescript/-/typescript-4.1.0-dev.20200924.tgz#d8b2aaa6f94ec22725eafcadf0b9a17aae9c32b9"
-  integrity sha512-AXwqVrp2AeVZ3jaZ/gcvxb0nnvqEbDFuFFjvV5/9wfcyz7KZx5KvyJENUgGoJHywCvl1PHKasQKYjzjk1QixnQ==
+typescript@^4.1.0-dev.20201018:
+  version "4.1.0-dev.20201018"
+  resolved "https://registry.yarnpkg.com/typescript/-/typescript-4.1.0-dev.20201018.tgz#1a4b8e3f9b640218a44299773371354d75bcfa34"
+  integrity sha512-cOFYP1I+IrMWa6ZfefxcacZha1pQMxrq8DGMBLkvrl8k3CqIdD8APq9LXaMj/PWrB8IPgDprY6jHwqiHg0/oGA==
 
 uc.micro@^1.0.1, uc.micro@^1.0.3:
   version "1.0.3"