diff --git a/extensions/package.json b/extensions/package.json
index 4e2b7a0d2ebfc806e86255a4a7d154b942a52b8d..d18865ad4de35d09523302d12693ae081e15ac1a 100644
--- a/extensions/package.json
+++ b/extensions/package.json
@@ -3,7 +3,7 @@
   "version": "0.0.1",
   "description": "Dependencies shared by all extensions",
   "dependencies": {
-    "typescript": "3.4.0-dev.20190311"
+    "typescript": "3.4.0-rc"
   },
   "scripts": {
     "postinstall": "node ./postinstall"
diff --git a/extensions/yarn.lock b/extensions/yarn.lock
index c401f29e410d73e1b2e313ab0a67283ebc230ac6..0c1d37b29a2002f97f9495cd122df226d9a1cb52 100644
--- a/extensions/yarn.lock
+++ b/extensions/yarn.lock
@@ -2,7 +2,7 @@
 # yarn lockfile v1
 
 
-typescript@3.4.0-dev.20190311:
-  version "3.4.0-dev.20190311"
-  resolved "https://registry.yarnpkg.com/typescript/-/typescript-3.4.0-dev.20190311.tgz#26cddf6b2ce178e48f6ef76dbf8d3eadf581b223"
-  integrity sha512-zBTywUjqyaW/yy/xNRW9jIXToHlsmILMqSrb6oW8Wm9+DSOUPu6QU3Jz6QigJQyKwTKLOSxMsssJ5Wys1iDjDg==
+typescript@3.4.0-rc:
+  version "3.4.0-rc"
+  resolved "https://registry.yarnpkg.com/typescript/-/typescript-3.4.0-rc.tgz#bc4026c3c517a30fa514b896f2684c6ba92caadb"
+  integrity sha512-wtm2GwuV0Yy2zvmpFaMDtWHnRbzfERi9FLpL+K+JqGkHoclgEQ6TmD1AMxMIjs80NWRIq0Xp1veQyuZbGsUYsg==