diff --git a/package.json b/package.json
index ebbfd856..4caabadd 100644
--- a/package.json
+++ b/package.json
@@ -55,7 +55,7 @@
     "prettier": "^2.0.5",
     "shx": "^0.3.2",
     "source-map-support": "^0.5.6",
-    "typescript": "~3.8",
+    "typescript": "~3.9",
     "webpack": "^4.12.0",
     "webpack-cli": "^3.3.8"
   }
diff --git a/packages/cli/package.json b/packages/cli/package.json
index 50fe5282..186f4c15 100644
--- a/packages/cli/package.json
+++ b/packages/cli/package.json
@@ -50,7 +50,7 @@
     "diff": "^4",
     "recast": "^0.18.0",
     "ts-node": "^8",
-    "typescript": "~3.8",
+    "typescript": "~3.9",
     "yargs": "^15.3.1"
   },
   "devDependencies": {
diff --git a/yarn.lock b/yarn.lock
index edcb146f..8eb1b8b5 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -7594,10 +7594,10 @@ typedarray@^0.0.6:
   resolved "https://registry.yarnpkg.com/typedarray/-/typedarray-0.0.6.tgz#867ac74e3864187b1d3d47d996a78ec5c8830777"
   integrity sha1-hnrHTjhkGHsdPUfZlqeOxciDB3c=
 
-typescript@~3.8:
-  version "3.8.3"
-  resolved "https://registry.yarnpkg.com/typescript/-/typescript-3.8.3.tgz#409eb8544ea0335711205869ec458ab109ee1061"
-  integrity sha512-MYlEfn5VrLNsgudQTVJeNaQFUAI7DkhnOjdpAp4T+ku1TfQClewlbSuTVHiA+8skNBgaf02TL/kLOvig4y3G8w==
+typescript@~3.9:
+  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==
 
 ua-parser-js@0.7.21:
   version "0.7.21"