diff --git a/package-lock.json b/package-lock.json
index 5334ca723..fcb53840f 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -67,7 +67,7 @@
         "strip-ansi": "^7.1.2",
         "ts-prune": "^0.10.3",
         "tsx": "^4.20.3",
-        "typescript": "^5.8.3",
+        "typescript": "^6.0.3",
         "typescript-eslint": "^8.30.1",
         "vitest": "^3.2.4",
         "yargs": "^17.7.2"
@@ -16376,9 +16376,9 @@
       }
     },
     "node_modules/typescript": {
-      "version": "5.8.3",
-      "resolved": "https://registry.npmjs.org/typescript/-/typescript-5.8.3.tgz",
-      "integrity": "sha512-p1diW6TqL9L07nNxvRMM7hMMw4c5XOo/1ibL4aAIGmSAt9slTE1Xgw5KWuof2uTOvCg9BY7ZRi+GaF+7sfgPeQ==",
+      "version": "6.0.3",
+      "resolved": "https://registry.npmjs.org/typescript/-/typescript-6.0.3.tgz",
+      "integrity": "sha512-y2TvuxSZPDyQakkFRPZHKFm+KKVqIisdg9/CZwm9ftvKXLP8NRWj38/ODjNbr43SsoXqNuAisEf1GdCxqWcdBw==",
       "devOptional": true,
       "license": "Apache-2.0",
       "bin": {
@@ -18140,7 +18140,7 @@
         "@types/tar": "^6.1.13",
         "dotenv": "^16.4.5",
         "supertest": "^7.1.4",
-        "typescript": "^5.3.3",
+        "typescript": "^6.0.3",
         "vitest": "^3.1.1"
       },
       "engines": {
@@ -18217,20 +18217,6 @@
         "node": ">=18"
       }
     },
-    "packages/a2a-server/node_modules/typescript": {
-      "version": "5.9.3",
-      "resolved": "https://registry.npmjs.org/typescript/-/typescript-5.9.3.tgz",
-      "integrity": "sha512-jl1vZzPDinLr9eUt3J/t7V6FgNEw9QjvBPdysz9KfQDD41fQrC2Y4vKQdiaUpFT4bXlb1RHhLpp8wtm6M5TgSw==",
-      "dev": true,
-      "license": "Apache-2.0",
-      "bin": {
-        "tsc": "bin/tsc",
-        "tsserver": "bin/tsserver"
-      },
-      "engines": {
-        "node": ">=14.17"
-      }
-    },
     "packages/a2a-server/node_modules/uuid": {
       "version": "13.0.2",
       "resolved": "https://registry.npmjs.org/uuid/-/uuid-13.0.2.tgz",
@@ -18304,7 +18290,7 @@
         "@types/ws": "^8.5.10",
         "@types/yargs": "^17.0.32",
         "@xterm/headless": "^5.5.0",
-        "typescript": "^5.3.3",
+        "typescript": "^6.0.3",
         "vitest": "^3.1.1"
       },
       "engines": {
@@ -18378,20 +18364,6 @@
         "node": ">=18"
       }
     },
-    "packages/cli/node_modules/typescript": {
-      "version": "5.9.3",
-      "resolved": "https://registry.npmjs.org/typescript/-/typescript-5.9.3.tgz",
-      "integrity": "sha512-jl1vZzPDinLr9eUt3J/t7V6FgNEw9QjvBPdysz9KfQDD41fQrC2Y4vKQdiaUpFT4bXlb1RHhLpp8wtm6M5TgSw==",
-      "dev": true,
-      "license": "Apache-2.0",
-      "bin": {
-        "tsc": "bin/tsc",
-        "tsserver": "bin/tsserver"
-      },
-      "engines": {
-        "node": ">=14.17"
-      }
-    },
     "packages/core": {
       "name": "@google/gemini-cli-core",
       "version": "0.44.0-nightly.20260512.g022e8baef",
@@ -18475,7 +18447,7 @@
         "@types/picomatch": "^4.0.1",
         "chrome-devtools-mcp": "^0.19.0",
         "msw": "^2.3.4",
-        "typescript": "^5.3.3",
+        "typescript": "^6.0.3",
         "vitest": "^3.1.1"
       },
       "engines": {
@@ -18645,20 +18617,6 @@
         "url": "https://paulmillr.com/funding/"
       }
     },
-    "packages/core/node_modules/typescript": {
-      "version": "5.9.3",
-      "resolved": "https://registry.npmjs.org/typescript/-/typescript-5.9.3.tgz",
-      "integrity": "sha512-jl1vZzPDinLr9eUt3J/t7V6FgNEw9QjvBPdysz9KfQDD41fQrC2Y4vKQdiaUpFT4bXlb1RHhLpp8wtm6M5TgSw==",
-      "dev": true,
-      "license": "Apache-2.0",
-      "bin": {
-        "tsc": "bin/tsc",
-        "tsserver": "bin/tsserver"
-      },
-      "engines": {
-        "node": ">=14.17"
-      }
-    },
     "packages/core/node_modules/uuid": {
       "version": "13.0.2",
       "resolved": "https://registry.npmjs.org/uuid/-/uuid-13.0.2.tgz",
@@ -18697,27 +18655,13 @@
         "zod-to-json-schema": "^3.23.1"
       },
       "devDependencies": {
-        "typescript": "^5.3.3",
+        "typescript": "^6.0.3",
         "vitest": "^3.1.1"
       },
       "engines": {
         "node": ">=20"
       }
     },
-    "packages/sdk/node_modules/typescript": {
-      "version": "5.9.3",
-      "resolved": "https://registry.npmjs.org/typescript/-/typescript-5.9.3.tgz",
-      "integrity": "sha512-jl1vZzPDinLr9eUt3J/t7V6FgNEw9QjvBPdysz9KfQDD41fQrC2Y4vKQdiaUpFT4bXlb1RHhLpp8wtm6M5TgSw==",
-      "dev": true,
-      "license": "Apache-2.0",
-      "bin": {
-        "tsc": "bin/tsc",
-        "tsserver": "bin/tsserver"
-      },
-      "engines": {
-        "node": ">=14.17"
-      }
-    },
     "packages/test-utils": {
       "name": "@google/gemini-cli-test-utils",
       "version": "0.44.0-nightly.20260512.g022e8baef",
@@ -18730,26 +18674,12 @@
         "vitest": "^3.2.4"
       },
       "devDependencies": {
-        "typescript": "^5.3.3"
+        "typescript": "^6.0.3"
       },
       "engines": {
         "node": ">=20"
       }
     },
-    "packages/test-utils/node_modules/typescript": {
-      "version": "5.9.3",
-      "resolved": "https://registry.npmjs.org/typescript/-/typescript-5.9.3.tgz",
-      "integrity": "sha512-jl1vZzPDinLr9eUt3J/t7V6FgNEw9QjvBPdysz9KfQDD41fQrC2Y4vKQdiaUpFT4bXlb1RHhLpp8wtm6M5TgSw==",
-      "dev": true,
-      "license": "Apache-2.0",
-      "bin": {
-        "tsc": "bin/tsc",
-        "tsserver": "bin/tsserver"
-      },
-      "engines": {
-        "node": ">=14.17"
-      }
-    },
     "packages/vscode-ide-companion": {
       "name": "gemini-cli-vscode-ide-companion",
       "version": "0.44.0-nightly.20260512.g022e8baef",
@@ -18771,7 +18701,7 @@
         "esbuild": "^0.25.3",
         "eslint": "^9.25.1",
         "npm-run-all2": "^8.0.2",
-        "typescript": "^5.8.3",
+        "typescript": "^6.0.3",
         "vitest": "^3.2.4"
       },
       "engines": {
@@ -18784,20 +18714,6 @@
       "integrity": "sha512-30sjmas1hQ0gVbX68LAWlm/YYlEqUErunPJJKLpEl+xhK0mKn+jyzlCOpsdTwfkZfPy4U6CDkmygBLC3AB8W9Q==",
       "dev": true,
       "license": "MIT"
-    },
-    "packages/vscode-ide-companion/node_modules/typescript": {
-      "version": "5.9.3",
-      "resolved": "https://registry.npmjs.org/typescript/-/typescript-5.9.3.tgz",
-      "integrity": "sha512-jl1vZzPDinLr9eUt3J/t7V6FgNEw9QjvBPdysz9KfQDD41fQrC2Y4vKQdiaUpFT4bXlb1RHhLpp8wtm6M5TgSw==",
-      "dev": true,
-      "license": "Apache-2.0",
-      "bin": {
-        "tsc": "bin/tsc",
-        "tsserver": "bin/tsserver"
-      },
-      "engines": {
-        "node": ">=14.17"
-      }
     }
   }
 }
diff --git a/package.json b/package.json
index 74d9826e5..170edfe96 100644
--- a/package.json
+++ b/package.json
@@ -137,7 +137,7 @@
     "strip-ansi": "^7.1.2",
     "ts-prune": "^0.10.3",
     "tsx": "^4.20.3",
-    "typescript": "^5.8.3",
+    "typescript": "^6.0.3",
     "typescript-eslint": "^8.30.1",
     "vitest": "^3.2.4",
     "yargs": "^17.7.2"
diff --git a/packages/a2a-server/package.json b/packages/a2a-server/package.json
index 611408caf..4d0fd94de 100644
--- a/packages/a2a-server/package.json
+++ b/packages/a2a-server/package.json
@@ -43,7 +43,7 @@
     "@types/tar": "^6.1.13",
     "dotenv": "^16.4.5",
     "supertest": "^7.1.4",
-    "typescript": "^5.3.3",
+    "typescript": "^6.0.3",
     "vitest": "^3.1.1"
   },
   "engines": {
diff --git a/packages/cli/package.json b/packages/cli/package.json
index b5f10d66d..d5b6ec2eb 100644
--- a/packages/cli/package.json
+++ b/packages/cli/package.json
@@ -82,7 +82,7 @@
     "@types/ws": "^8.5.10",
     "@types/yargs": "^17.0.32",
     "@xterm/headless": "^5.5.0",
-    "typescript": "^5.3.3",
+    "typescript": "^6.0.3",
     "vitest": "^3.1.1"
   },
   "engines": {
diff --git a/packages/core/package.json b/packages/core/package.json
index 14d0525d8..67da18b02 100644
--- a/packages/core/package.json
+++ b/packages/core/package.json
@@ -111,7 +111,7 @@
     "@types/picomatch": "^4.0.1",
     "chrome-devtools-mcp": "^0.19.0",
     "msw": "^2.3.4",
-    "typescript": "^5.3.3",
+    "typescript": "^6.0.3",
     "vitest": "^3.1.1"
   },
   "engines": {
diff --git a/packages/sdk/package.json b/packages/sdk/package.json
index 534e592b3..fce5d1881 100644
--- a/packages/sdk/package.json
+++ b/packages/sdk/package.json
@@ -27,7 +27,7 @@
     "zod-to-json-schema": "^3.23.1"
   },
   "devDependencies": {
-    "typescript": "^5.3.3",
+    "typescript": "^6.0.3",
     "vitest": "^3.1.1"
   },
   "engines": {
diff --git a/packages/test-utils/package.json b/packages/test-utils/package.json
index 7069af41d..4005be11e 100644
--- a/packages/test-utils/package.json
+++ b/packages/test-utils/package.json
@@ -17,7 +17,7 @@
     "vitest": "^3.2.4"
   },
   "devDependencies": {
-    "typescript": "^5.3.3"
+    "typescript": "^6.0.3"
   },
   "engines": {
     "node": ">=20"
diff --git a/packages/vscode-ide-companion/package.json b/packages/vscode-ide-companion/package.json
index 2a0a274ad..c8c2a336b 100644
--- a/packages/vscode-ide-companion/package.json
+++ b/packages/vscode-ide-companion/package.json
@@ -133,7 +133,7 @@
     "esbuild": "^0.25.3",
     "eslint": "^9.25.1",
     "npm-run-all2": "^8.0.2",
-    "typescript": "^5.8.3",
+    "typescript": "^6.0.3",
     "vitest": "^3.2.4"
   },
   "dependencies": {