diff --git a/package.json b/package.json
index 4444b7c8fe..8a96ec71ac 100644
--- a/package.json
+++ b/package.json
@@ -60,7 +60,7 @@
     "eslint-plugin-prettier": "^5.0.0",
     "prettier": "^3.0.0",
     "typedoc": "0.25.0",
-    "typescript": "5.1.6"
+    "typescript": "5.6.3"
   },
   "packageManager": "yarn@3.4.1",
   "//": "Pin jsonc-parser because v3.3.0 breaks rollup-plugin-esbuild",
diff --git a/packages/sdk/akamai-base/example/package.json b/packages/sdk/akamai-base/example/package.json
index 3daa983355..9a2ee30a2d 100644
--- a/packages/sdk/akamai-base/example/package.json
+++ b/packages/sdk/akamai-base/example/package.json
@@ -29,7 +29,7 @@
     "rollup-plugin-copy-assets": "^2.0.3",
     "rollup-plugin-node-polyfills": "^0.2.1",
     "tslib": "^2.5.2",
-    "typescript": "5.1.6"
+    "typescript": "5.6.3"
   },
   "dependencies": {
     "@launchdarkly/akamai-server-base-sdk": "2.1.20"
diff --git a/packages/sdk/akamai-base/package.json b/packages/sdk/akamai-base/package.json
index 2194620357..f77b562b7c 100644
--- a/packages/sdk/akamai-base/package.json
+++ b/packages/sdk/akamai-base/package.json
@@ -70,7 +70,7 @@
     "rollup-plugin-generate-package-json": "^3.2.0",
     "ts-jest": "^29.1.0",
     "typedoc": "0.25.0",
-    "typescript": "5.1.6"
+    "typescript": "5.6.3"
   },
   "dependencies": {
     "@launchdarkly/akamai-edgeworker-sdk-common": "^1.3.2",
diff --git a/packages/sdk/akamai-base/tsconfig.json b/packages/sdk/akamai-base/tsconfig.json
index 763d67b8b3..277d9e858f 100644
--- a/packages/sdk/akamai-base/tsconfig.json
+++ b/packages/sdk/akamai-base/tsconfig.json
@@ -5,7 +5,7 @@
     "outDir": "dist",
     "target": "es2017",
     "lib": ["ESNext"],
-    "module": "es6",
+    "module": "NodeNext",
     "strict": true,
     "noImplicitOverride": true,
     "allowSyntheticDefaultImports": true,
@@ -15,7 +15,7 @@
     "declarationMap": true, // enables importers to jump to source
     "resolveJsonModule": true,
     "stripInternal": true,
-    "moduleResolution": "nodenext",
+    "moduleResolution": "NodeNext",
     "types": ["jest", "node"],
     "skipLibCheck": true
   },
diff --git a/packages/sdk/akamai-edgekv/example/package.json b/packages/sdk/akamai-edgekv/example/package.json
index 6c577ce31c..e60d1801c6 100644
--- a/packages/sdk/akamai-edgekv/example/package.json
+++ b/packages/sdk/akamai-edgekv/example/package.json
@@ -28,7 +28,7 @@
     "rollup-plugin-copy-assets": "^2.0.3",
     "rollup-plugin-node-polyfills": "^0.2.1",
     "tslib": "^2.5.2",
-    "typescript": "5.1.6"
+    "typescript": "5.6.3"
   },
   "dependencies": {
     "@launchdarkly/akamai-server-edgekv-sdk": "1.3.0"
diff --git a/packages/sdk/akamai-edgekv/package.json b/packages/sdk/akamai-edgekv/package.json
index 9508b75a67..243d1e7210 100644
--- a/packages/sdk/akamai-edgekv/package.json
+++ b/packages/sdk/akamai-edgekv/package.json
@@ -70,7 +70,7 @@
     "rollup-plugin-generate-package-json": "^3.2.0",
     "ts-jest": "^29.1.0",
     "typedoc": "0.25.0",
-    "typescript": "5.1.6"
+    "typescript": "5.6.3"
   },
   "dependencies": {
     "@launchdarkly/akamai-edgeworker-sdk-common": "^1.3.2",
diff --git a/packages/sdk/browser/contract-tests/adapter/package.json b/packages/sdk/browser/contract-tests/adapter/package.json
index 13515342f0..5bbcf77149 100644
--- a/packages/sdk/browser/contract-tests/adapter/package.json
+++ b/packages/sdk/browser/contract-tests/adapter/package.json
@@ -34,7 +34,7 @@
     "eslint-plugin-prettier": "^5.0.0",
     "globals": "^15.9.0",
     "prettier": "^3.0.0",
-    "typescript": "^5.6.2",
+    "typescript": "5.6.3",
     "typescript-eslint": "^8.5.0"
   }
 }
diff --git a/packages/sdk/browser/contract-tests/adapter/tsconfig.json b/packages/sdk/browser/contract-tests/adapter/tsconfig.json
index f6ad77fb4c..fc904ad4fc 100644
--- a/packages/sdk/browser/contract-tests/adapter/tsconfig.json
+++ b/packages/sdk/browser/contract-tests/adapter/tsconfig.json
@@ -8,7 +8,6 @@
     "moduleResolution": "node",
     "outDir": "dist",
     "sourceMap": true,
-    "skipLibCheck": true
   },
   "lib": ["ES6"],
   "exclude": ["**/*.test.ts", "dist", "node_modules"]
diff --git a/packages/sdk/browser/contract-tests/entity/package.json b/packages/sdk/browser/contract-tests/entity/package.json
index 9d359fb812..d8967f60b0 100644
--- a/packages/sdk/browser/contract-tests/entity/package.json
+++ b/packages/sdk/browser/contract-tests/entity/package.json
@@ -25,7 +25,7 @@
     "eslint-plugin-jest": "^27.6.3",
     "eslint-plugin-prettier": "^5.0.0",
     "prettier": "^3.0.0",
-    "typescript": "^5.5.3",
+    "typescript": "5.6.3",
     "vite": "^5.4.1"
   }
 }
diff --git a/packages/sdk/browser/package.json b/packages/sdk/browser/package.json
index 38350826e5..0050104b5c 100644
--- a/packages/sdk/browser/package.json
+++ b/packages/sdk/browser/package.json
@@ -77,6 +77,6 @@
     "ts-jest": "^29.1.1",
     "tsup": "^8.3.5",
     "typedoc": "0.25.0",
-    "typescript": "^5.5.3"
+    "typescript": "5.6.3"
   }
 }
diff --git a/packages/sdk/cloudflare/example/package.json b/packages/sdk/cloudflare/example/package.json
index d0551b4db7..6bfba6de2b 100644
--- a/packages/sdk/cloudflare/example/package.json
+++ b/packages/sdk/cloudflare/example/package.json
@@ -16,7 +16,7 @@
     "miniflare": "^2.5.0",
     "prettier": "^3.2.5",
     "ts-jest": "^28.0.3",
-    "typescript": "5.1.6",
+    "typescript": "5.6.3",
     "wrangler": "2.20.2"
   },
   "scripts": {
diff --git a/packages/sdk/cloudflare/package.json b/packages/sdk/cloudflare/package.json
index 4963bf42e1..751c134fc5 100644
--- a/packages/sdk/cloudflare/package.json
+++ b/packages/sdk/cloudflare/package.json
@@ -75,7 +75,7 @@
     "rollup-plugin-generate-package-json": "^3.2.0",
     "ts-jest": "^29.1.0",
     "typedoc": "0.25.0",
-    "typescript": "5.1.6"
+    "typescript": "5.6.3"
   },
   "bundledDependencies": [
     "@launchdarkly/js-server-sdk-common-edge"
diff --git a/packages/sdk/react-native/example/package.json b/packages/sdk/react-native/example/package.json
index a79b3d473c..dcfb00964f 100644
--- a/packages/sdk/react-native/example/package.json
+++ b/packages/sdk/react-native/example/package.json
@@ -40,7 +40,7 @@
     "detox": "^20.17.1",
     "jest": "^29.7.0",
     "ts-jest": "^29.1.1",
-    "typescript": "^5.2.2"
+    "typescript": "5.6.3"
   },
   "packageManager": "yarn@3.4.1",
   "installConfig": {
diff --git a/packages/sdk/react-native/package.json b/packages/sdk/react-native/package.json
index 5cb458efc8..1f1beafd5f 100644
--- a/packages/sdk/react-native/package.json
+++ b/packages/sdk/react-native/package.json
@@ -70,6 +70,6 @@
     "ts-jest": "^29.1.1",
     "ts-node": "^10.9.2",
     "typedoc": "0.25.0",
-    "typescript": "5.1.6"
+    "typescript": "5.6.3"
   }
 }
diff --git a/packages/sdk/react-universal/example/package.json b/packages/sdk/react-universal/example/package.json
index 64b67d8ac9..a7876221b5 100644
--- a/packages/sdk/react-universal/example/package.json
+++ b/packages/sdk/react-universal/example/package.json
@@ -28,6 +28,6 @@
     "postcss": "^8",
     "prettier": "^3.3.0",
     "tailwindcss": "^3.3.0",
-    "typescript": "^5"
+    "typescript": "5.6.3"
   }
 }
diff --git a/packages/sdk/react-universal/package.json b/packages/sdk/react-universal/package.json
index c60b35f203..fac64ad6c6 100644
--- a/packages/sdk/react-universal/package.json
+++ b/packages/sdk/react-universal/package.json
@@ -64,7 +64,7 @@
     "rimraf": "^5.0.1",
     "ts-jest": "^29.1.0",
     "typedoc": "0.25.0",
-    "typescript": "5.1.6"
+    "typescript": "5.6.3"
   },
   "dependencies": {
     "@launchdarkly/js-client-sdk-common": "^1.1.4",
diff --git a/packages/sdk/server-ai/examples/bedrock/package.json b/packages/sdk/server-ai/examples/bedrock/package.json
index e000ad6566..578f5434b8 100644
--- a/packages/sdk/server-ai/examples/bedrock/package.json
+++ b/packages/sdk/server-ai/examples/bedrock/package.json
@@ -42,7 +42,7 @@
     "prettier": "^3.0.0",
     "rimraf": "^5.0.5",
     "typedoc": "0.25.0",
-    "typescript": "^5.5.3"
+    "typescript": "5.6.3"
   },
   "directories": {
     "example": "example"
diff --git a/packages/sdk/server-ai/examples/openai/package.json b/packages/sdk/server-ai/examples/openai/package.json
index 0be7b9cd62..2a9a234f2e 100644
--- a/packages/sdk/server-ai/examples/openai/package.json
+++ b/packages/sdk/server-ai/examples/openai/package.json
@@ -41,7 +41,7 @@
     "prettier": "^3.0.0",
     "rimraf": "^5.0.5",
     "typedoc": "0.25.0",
-    "typescript": "^5.5.3"
+    "typescript": "5.6.3"
   },
   "directories": {
     "example": "example"
diff --git a/packages/sdk/server-ai/package.json b/packages/sdk/server-ai/package.json
index f3a27c15a7..9bbc03fe60 100644
--- a/packages/sdk/server-ai/package.json
+++ b/packages/sdk/server-ai/package.json
@@ -45,7 +45,7 @@
     "jest": "^29.6.1",
     "prettier": "^3.0.0",
     "ts-jest": "^29.1.1",
-    "typescript": "5.1.6"
+    "typescript": "5.6.3"
   },
   "peerDependencies": {
     "@launchdarkly/js-server-sdk-common": "2.x"
diff --git a/packages/sdk/server-node/package.json b/packages/sdk/server-node/package.json
index 24024688ce..465f53063c 100644
--- a/packages/sdk/server-node/package.json
+++ b/packages/sdk/server-node/package.json
@@ -66,6 +66,6 @@
     "prettier": "^3.0.0",
     "ts-jest": "^29.0.5",
     "typedoc": "0.25.0",
-    "typescript": "5.1.6"
+    "typescript": "5.6.3"
   }
 }
diff --git a/packages/sdk/vercel/examples/complete/package.json b/packages/sdk/vercel/examples/complete/package.json
index 6e157f8784..338f7356c6 100644
--- a/packages/sdk/vercel/examples/complete/package.json
+++ b/packages/sdk/vercel/examples/complete/package.json
@@ -28,6 +28,6 @@
     "postcss": "^8.4.21",
     "tailwindcss": "^3.2.7",
     "turbo": "^1.8.5",
-    "typescript": "5.1.6"
+    "typescript": "5.6.3"
   }
 }
diff --git a/packages/sdk/vercel/examples/route-handler/package.json b/packages/sdk/vercel/examples/route-handler/package.json
index 656ddd7ea7..5bfa8d1ce2 100644
--- a/packages/sdk/vercel/examples/route-handler/package.json
+++ b/packages/sdk/vercel/examples/route-handler/package.json
@@ -22,6 +22,6 @@
     "autoprefixer": "10.4.14",
     "postcss": "8.4.31",
     "tailwindcss": "3.3.2",
-    "typescript": "5.1.6"
+    "typescript": "5.6.3"
   }
 }
diff --git a/packages/sdk/vercel/package.json b/packages/sdk/vercel/package.json
index 75e9127c9c..f07dab8fed 100644
--- a/packages/sdk/vercel/package.json
+++ b/packages/sdk/vercel/package.json
@@ -59,6 +59,6 @@
     "rimraf": "^5.0.0",
     "ts-jest": "^29.1.0",
     "typedoc": "0.25.0",
-    "typescript": "5.1.6"
+    "typescript": "5.6.3"
   }
 }
diff --git a/packages/shared/akamai-edgeworker-sdk/package.json b/packages/shared/akamai-edgeworker-sdk/package.json
index 2b9f12c6f9..4b966cccb7 100644
--- a/packages/shared/akamai-edgeworker-sdk/package.json
+++ b/packages/shared/akamai-edgeworker-sdk/package.json
@@ -52,7 +52,7 @@
     "rollup-plugin-generate-package-json": "^3.2.0",
     "ts-jest": "^29.1.0",
     "typedoc": "0.25.0",
-    "typescript": "5.1.6"
+    "typescript": "5.6.3"
   },
   "dependencies": {
     "@launchdarkly/js-server-sdk-common": "^2.10.0",
diff --git a/packages/shared/common/package.json b/packages/shared/common/package.json
index 707d75bc40..da90f212f0 100644
--- a/packages/shared/common/package.json
+++ b/packages/shared/common/package.json
@@ -66,6 +66,6 @@
     "ts-jest": "^29.0.5",
     "tslib": "^2.7.0",
     "typedoc": "0.25.0",
-    "typescript": "5.1.6"
+    "typescript": "5.6.3"
   }
 }
diff --git a/packages/shared/sdk-client/package.json b/packages/shared/sdk-client/package.json
index 5cbef61df8..e424435983 100644
--- a/packages/shared/sdk-client/package.json
+++ b/packages/shared/sdk-client/package.json
@@ -73,6 +73,6 @@
     "rollup": "^3.23.0",
     "ts-jest": "^29.1.1",
     "typedoc": "0.25.0",
-    "typescript": "5.1.6"
+    "typescript": "5.6.3"
   }
 }
diff --git a/packages/shared/sdk-server-edge/package.json b/packages/shared/sdk-server-edge/package.json
index b38716b013..5aaa448c82 100644
--- a/packages/shared/sdk-server-edge/package.json
+++ b/packages/shared/sdk-server-edge/package.json
@@ -60,6 +60,6 @@
     "rimraf": "^5.0.0",
     "ts-jest": "^29.1.0",
     "typedoc": "0.25.0",
-    "typescript": "5.1.6"
+    "typescript": "5.6.3"
   }
 }
diff --git a/packages/shared/sdk-server/package.json b/packages/shared/sdk-server/package.json
index 43e5ef1093..80979d1e28 100644
--- a/packages/shared/sdk-server/package.json
+++ b/packages/shared/sdk-server/package.json
@@ -49,6 +49,6 @@
     "prettier": "^3.0.0",
     "ts-jest": "^29.0.5",
     "typedoc": "0.25.0",
-    "typescript": "5.1.6"
+    "typescript": "5.6.3"
   }
 }
diff --git a/packages/shared/sdk-server/src/store/sortDataSet.ts b/packages/shared/sdk-server/src/store/sortDataSet.ts
index 3812faa2d6..4f35819d97 100644
--- a/packages/shared/sdk-server/src/store/sortDataSet.ts
+++ b/packages/shared/sdk-server/src/store/sortDataSet.ts
@@ -51,7 +51,7 @@ function topologicalSort(
 
   while (unvisitedItems.size > 0) {
     // Visit the next item, the order we visit doesn't matter.
-    const key = unvisitedItems.values().next().value;
+    const key = unvisitedItems.values().next().value!;
     visit(key);
   }
   return sortedItems;
diff --git a/packages/store/node-server-sdk-dynamodb/package.json b/packages/store/node-server-sdk-dynamodb/package.json
index 7206ffec54..f5a10e023a 100644
--- a/packages/store/node-server-sdk-dynamodb/package.json
+++ b/packages/store/node-server-sdk-dynamodb/package.json
@@ -51,6 +51,6 @@
     "prettier": "^3.0.0",
     "ts-jest": "^29.0.5",
     "typedoc": "0.25.0",
-    "typescript": "5.1.6"
+    "typescript": "5.6.3"
   }
 }
diff --git a/packages/store/node-server-sdk-redis/package.json b/packages/store/node-server-sdk-redis/package.json
index 9d252beb74..1d5c77bf17 100644
--- a/packages/store/node-server-sdk-redis/package.json
+++ b/packages/store/node-server-sdk-redis/package.json
@@ -49,6 +49,6 @@
     "prettier": "^3.0.0",
     "ts-jest": "^29.0.5",
     "typedoc": "0.25.0",
-    "typescript": "5.1.6"
+    "typescript": "5.6.3"
   }
 }
diff --git a/packages/telemetry/browser-telemetry/package.json b/packages/telemetry/browser-telemetry/package.json
index 2b35364212..9210227ae6 100644
--- a/packages/telemetry/browser-telemetry/package.json
+++ b/packages/telemetry/browser-telemetry/package.json
@@ -70,6 +70,6 @@
     "ts-jest": "^29.1.1",
     "tsup": "^8.3.5",
     "typedoc": "0.25.0",
-    "typescript": "^5.5.3"
+    "typescript": "5.6.3"
   }
 }
diff --git a/packages/telemetry/node-server-sdk-otel/package.json b/packages/telemetry/node-server-sdk-otel/package.json
index 4f8f00efc5..fb109dc58f 100644
--- a/packages/telemetry/node-server-sdk-otel/package.json
+++ b/packages/telemetry/node-server-sdk-otel/package.json
@@ -57,6 +57,6 @@
     "prettier": "^3.0.0",
     "ts-jest": "^29.1.1",
     "typedoc": "0.25.0",
-    "typescript": "5.1.6"
+    "typescript": "5.6.3"
   }
 }
diff --git a/packages/tooling/jest/example/react-native-example/package.json b/packages/tooling/jest/example/react-native-example/package.json
index a2898a7d11..60ae33e839 100644
--- a/packages/tooling/jest/example/react-native-example/package.json
+++ b/packages/tooling/jest/example/react-native-example/package.json
@@ -30,7 +30,7 @@
     "jest": "^29.7.0",
     "jest-expo": "^51.0.4",
     "react-test-renderer": "^18.2.0",
-    "typescript": "^5.1.3"
+    "typescript": "5.6.3"
   },
   "packageManager": "yarn@3.4.1",
   "installConfig": {
diff --git a/packages/tooling/jest/package.json b/packages/tooling/jest/package.json
index 1cb51dd224..57d601b5d8 100644
--- a/packages/tooling/jest/package.json
+++ b/packages/tooling/jest/package.json
@@ -59,7 +59,7 @@
     "rimraf": "^5.0.1",
     "ts-jest": "^29.1.0",
     "typedoc": "0.25.0",
-    "typescript": "5.1.6"
+    "typescript": "5.6.3"
   },
   "dependencies": {
     "@launchdarkly/react-native-client-sdk": "~10.9.0",