diff --git a/flipper-js-client-sdk/package.json b/flipper-js-client-sdk/package.json
index d0c6369a3..5d8208293 100644
--- a/flipper-js-client-sdk/package.json
+++ b/flipper-js-client-sdk/package.json
@@ -27,7 +27,7 @@
   "licenseFilename": "LICENSE",
   "readmeFilename": "README.md",
   "devDependencies": {
-    "typescript": "^3.9.2",
+    "typescript": "^4.0.2",
     "@typescript-eslint/eslint-plugin": "^2.27.0",
     "@typescript-eslint/parser": "^2.19.2",
     "ansi-to-html": "^0.6.3",
diff --git a/flipper-js-client-sdk/yarn.lock b/flipper-js-client-sdk/yarn.lock
index 156986d2a..3a1a2cd4b 100644
--- a/flipper-js-client-sdk/yarn.lock
+++ b/flipper-js-client-sdk/yarn.lock
@@ -1704,10 +1704,10 @@ type-fest@^0.8.1:
   resolved "https://registry.yarnpkg.com/type-fest/-/type-fest-0.8.1.tgz#09e249ebde851d3b1e48d27c105444667f17b83d"
   integrity sha512-4dbzIzqvjtgiM5rw1k5rEHtBANKmdudhGyBEajN01fEyhaAIhsoKNy6y7+IN93IfpFtwY9iqi7kD+xwKhQsNJA==
 
-typescript@^3.9.2:
-  version "3.9.5"
-  resolved "https://registry.yarnpkg.com/typescript/-/typescript-3.9.5.tgz#586f0dba300cde8be52dd1ac4f7e1009c1b13f36"
-  integrity sha512-hSAifV3k+i6lEoCJ2k6R2Z/rp/H3+8sdmcn5NrS3/3kE7+RyZXm9aqvxWqjEXHAd8b0pShatpcdMTvEdvAJltQ==
+typescript@^4.0.2:
+  version "4.0.2"
+  resolved "https://registry.yarnpkg.com/typescript/-/typescript-4.0.2.tgz#7ea7c88777c723c681e33bf7988be5d008d05ac2"
+  integrity sha512-e4ERvRV2wb+rRZ/IQeb3jm2VxBsirQLpQhdxplZ2MEzGvDkkMmPglecnNDfSUBivMjP93vRbngYYDQqQ/78bcQ==
 
 uri-js@^4.2.2:
   version "4.2.2"