diff --git a/package.json b/package.json
index 967066c3c6..d6ecd0bb0d 100644
--- a/package.json
+++ b/package.json
@@ -32,7 +32,7 @@
     "standard-version": "^9.1.0",
     "ts-jest": "^26.5.1",
     "ts-node": "^9.1.1",
-    "typescript": "~3.9.8"
+    "typescript": "~3.9.9"
   },
   "repository": {
     "type": "git",
diff --git a/packages/@jsii/dotnet-runtime-test/package.json b/packages/@jsii/dotnet-runtime-test/package.json
index 186f5decf2..ef3f050780 100644
--- a/packages/@jsii/dotnet-runtime-test/package.json
+++ b/packages/@jsii/dotnet-runtime-test/package.json
@@ -34,6 +34,6 @@
     "@types/node": "^10.17.51",
     "jsii-calc": "^3.20.120",
     "jsii-pacmak": "^0.0.0",
-    "typescript": "~3.9.8"
+    "typescript": "~3.9.9"
   }
 }
diff --git a/packages/@jsii/dotnet-runtime/package.json b/packages/@jsii/dotnet-runtime/package.json
index f0cd504d8c..36a8eec561 100644
--- a/packages/@jsii/dotnet-runtime/package.json
+++ b/packages/@jsii/dotnet-runtime/package.json
@@ -43,6 +43,6 @@
     "@types/semver": "^7.3.4",
     "jsii-build-tools": "^0.0.0",
     "semver": "^7.3.4",
-    "typescript": "~3.9.8"
+    "typescript": "~3.9.9"
   }
 }
diff --git a/packages/@jsii/go-runtime/package.json b/packages/@jsii/go-runtime/package.json
index 49a6ca302f..1c71b71f29 100644
--- a/packages/@jsii/go-runtime/package.json
+++ b/packages/@jsii/go-runtime/package.json
@@ -31,6 +31,6 @@
     "jsii-pacmak": "^0.0.0",
     "prettier": "^2.2.1",
     "ts-node": "^9.1.1",
-    "typescript": "~3.9.8"
+    "typescript": "~3.9.9"
   }
 }
diff --git a/packages/@jsii/integ-test/package.json b/packages/@jsii/integ-test/package.json
index c82cff5d01..82eed4bb63 100644
--- a/packages/@jsii/integ-test/package.json
+++ b/packages/@jsii/integ-test/package.json
@@ -34,6 +34,6 @@
     "@types/tar": "^4.0.4",
     "eslint": "^7.19.0",
     "prettier": "^2.2.1",
-    "typescript": "~3.9.8"
+    "typescript": "~3.9.9"
   }
 }
diff --git a/packages/@jsii/java-runtime/package.json b/packages/@jsii/java-runtime/package.json
index 0258b9638b..3ece8f9db3 100644
--- a/packages/@jsii/java-runtime/package.json
+++ b/packages/@jsii/java-runtime/package.json
@@ -35,6 +35,6 @@
     "@jsii/runtime": "^0.0.0",
     "@types/node": "^10.17.51",
     "jsii-build-tools": "^0.0.0",
-    "typescript": "~3.9.8"
+    "typescript": "~3.9.9"
   }
 }
diff --git a/packages/@jsii/kernel/package.json b/packages/@jsii/kernel/package.json
index e8696896d1..c69e553ab3 100644
--- a/packages/@jsii/kernel/package.json
+++ b/packages/@jsii/kernel/package.json
@@ -50,6 +50,6 @@
     "jsii-calc": "^3.20.120",
     "prettier": "^2.2.1",
     "ts-jest": "^26.5.1",
-    "typescript": "~3.9.8"
+    "typescript": "~3.9.9"
   }
 }
diff --git a/packages/@jsii/python-runtime/package.json b/packages/@jsii/python-runtime/package.json
index da062576c2..8028c99b5a 100644
--- a/packages/@jsii/python-runtime/package.json
+++ b/packages/@jsii/python-runtime/package.json
@@ -42,6 +42,6 @@
     "jsii-calc": "^3.20.120",
     "jsii-pacmak": "^0.0.0",
     "ts-node": "^9.1.1",
-    "typescript": "~3.9.8"
+    "typescript": "~3.9.9"
   }
 }
diff --git a/packages/@jsii/runtime/package.json b/packages/@jsii/runtime/package.json
index 18e9e51b12..aed09a102c 100644
--- a/packages/@jsii/runtime/package.json
+++ b/packages/@jsii/runtime/package.json
@@ -49,7 +49,7 @@
     "prettier": "^2.2.1",
     "source-map-loader": "^2.0.1",
     "ts-jest": "^26.5.1",
-    "typescript": "~3.9.8",
+    "typescript": "~3.9.9",
     "webpack": "^5.21.2",
     "webpack-cli": "^4.5.0"
   }
diff --git a/packages/@jsii/spec/package.json b/packages/@jsii/spec/package.json
index 33616b7d1b..f82c86d6a2 100644
--- a/packages/@jsii/spec/package.json
+++ b/packages/@jsii/spec/package.json
@@ -40,7 +40,7 @@
     "jest": "^26.6.3",
     "jsii-build-tools": "^0.0.0",
     "prettier": "^2.2.1",
-    "typescript": "~3.9.8",
+    "typescript": "~3.9.9",
     "typescript-json-schema": "^0.48.0"
   }
 }
diff --git a/packages/codemaker/package.json b/packages/codemaker/package.json
index 2f3c73bb64..6b1a199fa1 100644
--- a/packages/codemaker/package.json
+++ b/packages/codemaker/package.json
@@ -42,6 +42,6 @@
     "eslint": "^7.19.0",
     "jest": "^26.6.3",
     "prettier": "^2.2.1",
-    "typescript": "~3.9.8"
+    "typescript": "~3.9.9"
   }
 }
diff --git a/packages/jsii-config/package.json b/packages/jsii-config/package.json
index 4ca4d32ff1..a8e6227a51 100644
--- a/packages/jsii-config/package.json
+++ b/packages/jsii-config/package.json
@@ -28,7 +28,7 @@
     "jest": "^26.6.3",
     "jest-expect-message": "^1.0.2",
     "prettier": "^2.2.1",
-    "typescript": "~3.9.8"
+    "typescript": "~3.9.9"
   },
   "dependencies": {
     "@jsii/spec": "^0.0.0",
diff --git a/packages/jsii-diff/package.json b/packages/jsii-diff/package.json
index 43a747e973..bc103909ea 100644
--- a/packages/jsii-diff/package.json
+++ b/packages/jsii-diff/package.json
@@ -37,7 +37,7 @@
     "fs-extra": "^9.1.0",
     "jsii-reflect": "^0.0.0",
     "log4js": "^6.3.0",
-    "typescript": "~3.9.8",
+    "typescript": "~3.9.9",
     "yargs": "^16.2.0"
   },
   "devDependencies": {
diff --git a/packages/jsii-pacmak/package.json b/packages/jsii-pacmak/package.json
index 4574b58c7b..e9928f8fd5 100644
--- a/packages/jsii-pacmak/package.json
+++ b/packages/jsii-pacmak/package.json
@@ -68,7 +68,7 @@
     "jsii-calc": "^3.20.120",
     "prettier": "^2.2.1",
     "ts-jest": "^26.5.1",
-    "typescript": "~3.9.8"
+    "typescript": "~3.9.9"
   },
   "keywords": [
     "jsii",
diff --git a/packages/jsii-reflect/package.json b/packages/jsii-reflect/package.json
index 22dede61ba..9627a6ae2e 100644
--- a/packages/jsii-reflect/package.json
+++ b/packages/jsii-reflect/package.json
@@ -52,6 +52,6 @@
     "jsii-build-tools": "^0.0.0",
     "jsii-calc": "^3.20.120",
     "prettier": "^2.2.1",
-    "typescript": "~3.9.8"
+    "typescript": "~3.9.9"
   }
 }
diff --git a/packages/jsii-rosetta/package.json b/packages/jsii-rosetta/package.json
index a534cc41ca..d26cce3f5f 100644
--- a/packages/jsii-rosetta/package.json
+++ b/packages/jsii-rosetta/package.json
@@ -34,7 +34,7 @@
     "@jsii/spec": "^0.0.0",
     "commonmark": "^0.29.3",
     "fs-extra": "^9.1.0",
-    "typescript": "~3.9.8",
+    "typescript": "~3.9.9",
     "xmldom": "^0.4.0",
     "yargs": "^16.2.0"
   },
diff --git a/packages/jsii/package.json b/packages/jsii/package.json
index 7420435a13..a69d66cd9f 100644
--- a/packages/jsii/package.json
+++ b/packages/jsii/package.json
@@ -44,7 +44,7 @@
     "semver-intersect": "^1.4.0",
     "sort-json": "^2.0.0",
     "spdx-license-list": "^6.4.0",
-    "typescript": "~3.9.8",
+    "typescript": "~3.9.9",
     "yargs": "^16.2.0"
   },
   "devDependencies": {
diff --git a/packages/oo-ascii-tree/package.json b/packages/oo-ascii-tree/package.json
index a85a0eb044..6531a7e58f 100644
--- a/packages/oo-ascii-tree/package.json
+++ b/packages/oo-ascii-tree/package.json
@@ -37,6 +37,6 @@
     "jest": "^26.6.3",
     "jsii-build-tools": "^0.0.0",
     "prettier": "^2.2.1",
-    "typescript": "~3.9.8"
+    "typescript": "~3.9.9"
   }
 }
diff --git a/yarn.lock b/yarn.lock
index 6dd4b5ae6f..f3243865e7 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -8829,10 +8829,10 @@ typescript@^4.1.3:
   resolved "https://registry.yarnpkg.com/typescript/-/typescript-4.1.4.tgz#f058636e2f4f83f94ddaae07b20fd5e14598432f"
   integrity sha512-+Uru0t8qIRgjuCpiSPpfGuhHecMllk5Zsazj5LZvVsEStEjmIRRBZe+jHjGQvsgS7M1wONy2PQXd67EMyV6acg==
 
-typescript@~3.9.8:
-  version "3.9.8"
-  resolved "https://registry.yarnpkg.com/typescript/-/typescript-3.9.8.tgz#7d937ba4e4044af7fa83d127b982f8f61ca816a4"
-  integrity sha512-nDbnFkUZZjkQ92qwKX+C+jtk4OGfU8H9toSEs3uAsl8cxLjG2sqQm6leF/pLWvm9FAEJ6KHkYMAbHYaY2ITeVg==
+typescript@~3.9.9:
+  version "3.9.9"
+  resolved "https://registry.yarnpkg.com/typescript/-/typescript-3.9.9.tgz#e69905c54bc0681d0518bd4d587cc6f2d0b1a674"
+  integrity sha512-kdMjTiekY+z/ubJCATUPlRDl39vXYiMV9iyeMuEuXZh2we6zz80uovNN2WlAxmmdE/Z/YQe+EbOEXB5RHEED3w==
 
 uglify-js@^3.1.4:
   version "3.12.7"