diff --git a/build/package.json b/build/package.json
index 73c7d0a7dae..c55703abc59 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.20200916",
+    "typescript": "^4.1.0-dev.20200918",
     "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 236831e9561..df3a7e60123 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.20200916:
-  version "4.1.0-dev.20200916"
-  resolved "https://registry.yarnpkg.com/typescript/-/typescript-4.1.0-dev.20200916.tgz#b2c803a39d9335086033009903b03e7e53e39223"
-  integrity sha512-ly2k/AZ3AyfIyLWhBSnW3x7aDufIS9uNRagFZin36jXb6DvZEZwtyx138u8iSvtKE1AV/VNyWLLBkZYojgBM1g==
+typescript@^4.1.0-dev.20200918:
+  version "4.1.0-dev.20200918"
+  resolved "https://registry.yarnpkg.com/typescript/-/typescript-4.1.0-dev.20200918.tgz#b00beedf2da8dbba09284085114e77bf8f329686"
+  integrity sha512-cEcXJvz55OH3k3cmpMYoVfqdAQ2YvgeccUmccmleUnQ8VqR8T/7GI761Qky/vGZO/VhiU3Y8xJF3oLkAkNrG1g==
 
 typical@^4.0.0:
   version "4.0.0"
diff --git a/package.json b/package.json
index d509ab5e401..e9b73b70445 100644
--- a/package.json
+++ b/package.json
@@ -166,7 +166,7 @@
     "style-loader": "^1.0.0",
     "ts-loader": "^4.4.2",
     "tsec": "googleinterns/tsec",
-    "typescript": "^4.1.0-dev.20200916",
+    "typescript": "^4.1.0-dev.20200918",
     "typescript-formatter": "7.1.0",
     "underscore": "^1.8.2",
     "vinyl": "^2.0.0",
diff --git a/yarn.lock b/yarn.lock
index 97ae9cf2d86..a75d88cb39d 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -9264,10 +9264,10 @@ 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.20200916:
-  version "4.1.0-dev.20200916"
-  resolved "https://registry.yarnpkg.com/typescript/-/typescript-4.1.0-dev.20200916.tgz#b2c803a39d9335086033009903b03e7e53e39223"
-  integrity sha512-ly2k/AZ3AyfIyLWhBSnW3x7aDufIS9uNRagFZin36jXb6DvZEZwtyx138u8iSvtKE1AV/VNyWLLBkZYojgBM1g==
+typescript@^4.1.0-dev.20200918:
+  version "4.1.0-dev.20200918"
+  resolved "https://registry.yarnpkg.com/typescript/-/typescript-4.1.0-dev.20200918.tgz#b00beedf2da8dbba09284085114e77bf8f329686"
+  integrity sha512-cEcXJvz55OH3k3cmpMYoVfqdAQ2YvgeccUmccmleUnQ8VqR8T/7GI761Qky/vGZO/VhiU3Y8xJF3oLkAkNrG1g==
 
 uc.micro@^1.0.1, uc.micro@^1.0.3:
   version "1.0.3"