diff --git a/acceptance/repository-cloudant/package.json b/acceptance/repository-cloudant/package.json
index 4f2ace211262..be3df4b8d70d 100644
--- a/acceptance/repository-cloudant/package.json
+++ b/acceptance/repository-cloudant/package.json
@@ -45,6 +45,6 @@
     "loopback-connector-cloudant": "2.5.0",
     "ms": "2.1.3",
     "tslib": "^2.8.1",
-    "typescript": "~5.2.2"
+    "typescript": "~5.9.3"
   }
 }
diff --git a/bodyparsers/rest-msgpack/package.json b/bodyparsers/rest-msgpack/package.json
index 05adbc987342..a0855837ab57 100644
--- a/bodyparsers/rest-msgpack/package.json
+++ b/bodyparsers/rest-msgpack/package.json
@@ -48,6 +48,6 @@
     "@types/msgpack5": "^3.4.6",
     "@types/node": "^20.19.39",
     "@types/type-is": "^1.6.7",
-    "typescript": "~5.2.2"
+    "typescript": "~5.9.3"
   }
 }
diff --git a/examples/access-control-migration/package.json b/examples/access-control-migration/package.json
index e47bd5269cb0..bd1d1a09edaf 100644
--- a/examples/access-control-migration/package.json
+++ b/examples/access-control-migration/package.json
@@ -75,6 +75,6 @@
     "@types/node": "^20.19.39",
     "eslint": "^8.57.1",
     "lodash": "^4.18.1",
-    "typescript": "~5.2.2"
+    "typescript": "~5.9.3"
   }
 }
diff --git a/examples/binding-resolution/package.json b/examples/binding-resolution/package.json
index f86b53022aad..41364f0b302c 100644
--- a/examples/binding-resolution/package.json
+++ b/examples/binding-resolution/package.json
@@ -58,6 +58,6 @@
     "@types/node": "^20.19.39",
     "eslint": "^8.57.1",
     "source-map-support": "^0.5.21",
-    "typescript": "~5.2.2"
+    "typescript": "~5.9.3"
   }
 }
diff --git a/examples/context/package.json b/examples/context/package.json
index 8501423a14aa..d73e84b78983 100644
--- a/examples/context/package.json
+++ b/examples/context/package.json
@@ -55,6 +55,6 @@
     "@loopback/testlab": "^8.0.11",
     "@types/node": "^20.19.39",
     "eslint": "^8.57.1",
-    "typescript": "~5.2.2"
+    "typescript": "~5.9.3"
   }
 }
diff --git a/examples/express-composition/package.json b/examples/express-composition/package.json
index b635d9904f22..c34748dc85c6 100644
--- a/examples/express-composition/package.json
+++ b/examples/express-composition/package.json
@@ -63,6 +63,6 @@
     "@types/express": "^4.17.25",
     "@types/node": "^20.19.39",
     "eslint": "^8.57.1",
-    "typescript": "~5.2.2"
+    "typescript": "~5.9.3"
   }
 }
diff --git a/examples/file-transfer/package.json b/examples/file-transfer/package.json
index c21c2ddd77a8..003675eeb1b6 100644
--- a/examples/file-transfer/package.json
+++ b/examples/file-transfer/package.json
@@ -61,6 +61,6 @@
     "@types/multer": "^2.1.0",
     "@types/node": "^20.19.39",
     "eslint": "^8.57.1",
-    "typescript": "~5.2.2"
+    "typescript": "~5.9.3"
   }
 }
diff --git a/examples/graphql/package.json b/examples/graphql/package.json
index 977ed0947458..b83ac225c822 100644
--- a/examples/graphql/package.json
+++ b/examples/graphql/package.json
@@ -68,6 +68,6 @@
     "graphql-ws": "^5.16.2",
     "rimraf": "^5.0.10",
     "source-map-support": "^0.5.21",
-    "typescript": "~5.2.2"
+    "typescript": "~5.9.3"
   }
 }
diff --git a/examples/greeter-extension/package.json b/examples/greeter-extension/package.json
index 7c7d1cfe5165..e35248436403 100644
--- a/examples/greeter-extension/package.json
+++ b/examples/greeter-extension/package.json
@@ -59,6 +59,6 @@
     "@types/debug": "4.1.13",
     "@types/node": "^20.19.39",
     "eslint": "^8.57.1",
-    "typescript": "~5.2.2"
+    "typescript": "~5.9.3"
   }
 }
diff --git a/examples/greeting-app/package.json b/examples/greeting-app/package.json
index 14ef5019deac..c2d1a055839c 100644
--- a/examples/greeting-app/package.json
+++ b/examples/greeting-app/package.json
@@ -63,6 +63,6 @@
     "@types/debug": "4.1.13",
     "@types/node": "^20.19.39",
     "eslint": "^8.57.1",
-    "typescript": "~5.2.2"
+    "typescript": "~5.9.3"
   }
 }
diff --git a/examples/hello-world/package.json b/examples/hello-world/package.json
index 47de0bbebd59..5e6532fb814f 100644
--- a/examples/hello-world/package.json
+++ b/examples/hello-world/package.json
@@ -56,6 +56,6 @@
     "@loopback/testlab": "^8.0.11",
     "@types/node": "^20.19.39",
     "eslint": "^8.57.1",
-    "typescript": "~5.2.2"
+    "typescript": "~5.9.3"
   }
 }
diff --git a/examples/lb3-application/package.json b/examples/lb3-application/package.json
index a0704b4ccd21..11ef68582a96 100644
--- a/examples/lb3-application/package.json
+++ b/examples/lb3-application/package.json
@@ -71,6 +71,6 @@
     "eslint": "^8.57.1",
     "lodash": "^4.18.1",
     "should": "^13.2.3",
-    "typescript": "~5.2.2"
+    "typescript": "~5.9.3"
   }
 }
diff --git a/examples/log-extension/package.json b/examples/log-extension/package.json
index a7c6c0ec35b5..c8b4e09741d5 100644
--- a/examples/log-extension/package.json
+++ b/examples/log-extension/package.json
@@ -58,6 +58,6 @@
     "@types/debug": "^4.1.13",
     "@types/node": "^20.19.39",
     "eslint": "^8.57.1",
-    "typescript": "~5.2.2"
+    "typescript": "~5.9.3"
   }
 }
diff --git a/examples/metrics-prometheus/package.json b/examples/metrics-prometheus/package.json
index 3d4116a8796f..516cc689a2d3 100644
--- a/examples/metrics-prometheus/package.json
+++ b/examples/metrics-prometheus/package.json
@@ -59,6 +59,6 @@
     "@loopback/testlab": "^8.0.11",
     "@types/node": "^20.19.39",
     "eslint": "^8.57.1",
-    "typescript": "~5.2.2"
+    "typescript": "~5.9.3"
   }
 }
diff --git a/examples/multi-tenancy/package.json b/examples/multi-tenancy/package.json
index 5a20747714f7..97a8f90860a3 100644
--- a/examples/multi-tenancy/package.json
+++ b/examples/multi-tenancy/package.json
@@ -73,6 +73,6 @@
     "@types/node": "^20.19.39",
     "eslint": "^8.57.1",
     "source-map-support": "^0.5.21",
-    "typescript": "~5.2.2"
+    "typescript": "~5.9.3"
   }
 }
diff --git a/examples/passport-login/package.json b/examples/passport-login/package.json
index 8b783c276b7f..a5e35f22b47a 100644
--- a/examples/passport-login/package.json
+++ b/examples/passport-login/package.json
@@ -97,6 +97,6 @@
     "axios": "^1.15.0",
     "eslint": "^8.57.1",
     "lodash": "^4.18.1",
-    "typescript": "~5.2.2"
+    "typescript": "~5.9.3"
   }
 }
diff --git a/examples/references-many/package.json b/examples/references-many/package.json
index c33b49fc408f..13ce077c6763 100644
--- a/examples/references-many/package.json
+++ b/examples/references-many/package.json
@@ -71,6 +71,6 @@
     "@types/node": "^20.19.39",
     "eslint": "^8.57.1",
     "lodash": "^4.18.1",
-    "typescript": "~5.2.2"
+    "typescript": "~5.9.3"
   }
 }
diff --git a/examples/rest-crud/package.json b/examples/rest-crud/package.json
index 2bcea7d6bd76..2b636f451560 100644
--- a/examples/rest-crud/package.json
+++ b/examples/rest-crud/package.json
@@ -68,6 +68,6 @@
     "@types/node": "^20.19.39",
     "eslint": "^8.57.1",
     "lodash": "^4.18.1",
-    "typescript": "~5.2.2"
+    "typescript": "~5.9.3"
   }
 }
diff --git a/examples/rpc-server/package.json b/examples/rpc-server/package.json
index d4a1e54a9f0a..34caf8972dab 100644
--- a/examples/rpc-server/package.json
+++ b/examples/rpc-server/package.json
@@ -53,6 +53,6 @@
     "@types/express": "^4.17.25",
     "@types/node": "^20.19.39",
     "eslint": "^8.57.1",
-    "typescript": "~5.2.2"
+    "typescript": "~5.9.3"
   }
 }
diff --git a/examples/soap-calculator/package.json b/examples/soap-calculator/package.json
index b09ae4c26700..ac39560b8ea0 100644
--- a/examples/soap-calculator/package.json
+++ b/examples/soap-calculator/package.json
@@ -63,6 +63,6 @@
     "eslint": "^8.57.1",
     "mocha": "^11.7.5",
     "source-map-support": "^0.5.21",
-    "typescript": "~5.2.2"
+    "typescript": "~5.9.3"
   }
 }
diff --git a/examples/socketio/package.json b/examples/socketio/package.json
index f75feda8c179..a56787343708 100644
--- a/examples/socketio/package.json
+++ b/examples/socketio/package.json
@@ -69,6 +69,6 @@
     "eslint": "^8.57.1",
     "socket.io-client": "^4.8.3",
     "source-map-support": "^0.5.21",
-    "typescript": "~5.2.2"
+    "typescript": "~5.9.3"
   }
 }
diff --git a/examples/todo-jwt/package.json b/examples/todo-jwt/package.json
index 0726b1643f5f..e64b2b70fb12 100644
--- a/examples/todo-jwt/package.json
+++ b/examples/todo-jwt/package.json
@@ -75,6 +75,6 @@
     "@types/node": "^20.19.39",
     "eslint": "^8.57.1",
     "lodash": "^4.18.1",
-    "typescript": "~5.2.2"
+    "typescript": "~5.9.3"
   }
 }
diff --git a/examples/todo-list/package.json b/examples/todo-list/package.json
index b9d7ae240b25..598608a78cde 100644
--- a/examples/todo-list/package.json
+++ b/examples/todo-list/package.json
@@ -71,6 +71,6 @@
     "@types/node": "^20.19.39",
     "eslint": "^8.57.1",
     "lodash": "^4.18.1",
-    "typescript": "~5.2.2"
+    "typescript": "~5.9.3"
   }
 }
diff --git a/examples/todo/package.json b/examples/todo/package.json
index 9f61f0bb0ec4..a23fdeda83af 100644
--- a/examples/todo/package.json
+++ b/examples/todo/package.json
@@ -71,6 +71,6 @@
     "@types/node": "^20.19.39",
     "eslint": "^8.57.1",
     "lodash": "^4.18.1",
-    "typescript": "~5.2.2"
+    "typescript": "~5.9.3"
   }
 }
diff --git a/examples/validation-app/package.json b/examples/validation-app/package.json
index 028130d3d8f3..ff5dbcc82af0 100644
--- a/examples/validation-app/package.json
+++ b/examples/validation-app/package.json
@@ -66,6 +66,6 @@
     "@types/node": "^20.19.39",
     "eslint": "^8.57.1",
     "source-map-support": "^0.5.21",
-    "typescript": "~5.2.2"
+    "typescript": "~5.9.3"
   }
 }
diff --git a/examples/webpack/package.json b/examples/webpack/package.json
index 31b3643b8fa1..d26313911b6b 100644
--- a/examples/webpack/package.json
+++ b/examples/webpack/package.json
@@ -51,7 +51,7 @@
     "events": "^3.3.0",
     "process": "^0.11.10",
     "puppeteer": "^24.40.0",
-    "typescript": "~5.2.2",
+    "typescript": "~5.9.3",
     "util": "^0.12.5",
     "webpack": "^5.106.1",
     "webpack-cli": "^7.0.2"
diff --git a/extensions/authentication-jwt/package.json b/extensions/authentication-jwt/package.json
index 077935d81dd5..07b888259138 100644
--- a/extensions/authentication-jwt/package.json
+++ b/extensions/authentication-jwt/package.json
@@ -62,6 +62,6 @@
     "@types/lodash": "^4.17.24",
     "@types/node": "^20.19.39",
     "lodash": "^4.18.1",
-    "typescript": "~5.2.2"
+    "typescript": "~5.9.3"
   }
 }
diff --git a/extensions/pooling/package.json b/extensions/pooling/package.json
index f922ad53cea8..e9689769bef8 100644
--- a/extensions/pooling/package.json
+++ b/extensions/pooling/package.json
@@ -49,6 +49,6 @@
     "@loopback/testlab": "^8.0.11",
     "@types/debug": "^4.1.13",
     "@types/node": "^20.19.39",
-    "typescript": "~5.2.2"
+    "typescript": "~5.9.3"
   }
 }
diff --git a/extensions/sequelize/package.json b/extensions/sequelize/package.json
index 8e2f7b635c99..8c0088a7d828 100644
--- a/extensions/sequelize/package.json
+++ b/extensions/sequelize/package.json
@@ -60,6 +60,6 @@
     "pg": "^8.20.0",
     "pg-hstore": "^2.3.4",
     "sqlite3": "5.1.7",
-    "typescript": "~5.2.2"
+    "typescript": "~5.9.3"
   }
 }
diff --git a/package-lock.json b/package-lock.json
index 67bbbe7ac34f..aa73d1878498 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -42,7 +42,7 @@
         "mem-fs-editor": "^9.7.0",
         "open-cli": "^8.0.0",
         "prettier": "^3.8.2",
-        "typescript": "~5.2.2"
+        "typescript": "~5.9.3"
       },
       "engines": {
         "node": "20 || 22 || 24",
@@ -102,7 +102,7 @@
         "loopback-connector-cloudant": "2.5.0",
         "ms": "2.1.3",
         "tslib": "^2.8.1",
-        "typescript": "~5.2.2"
+        "typescript": "~5.9.3"
       },
       "engines": {
         "node": "20 || 22 || 24"
@@ -298,7 +298,7 @@
         "@types/msgpack5": "^3.4.6",
         "@types/node": "^20.19.39",
         "@types/type-is": "^1.6.7",
-        "typescript": "~5.2.2"
+        "typescript": "~5.9.3"
       },
       "engines": {
         "node": "20 || 22 || 24"
@@ -409,7 +409,7 @@
         "@types/node": "^20.19.39",
         "eslint": "^8.57.1",
         "lodash": "^4.18.1",
-        "typescript": "~5.2.2"
+        "typescript": "~5.9.3"
       },
       "engines": {
         "node": "20 || 22 || 24"
@@ -451,7 +451,7 @@
         "@types/node": "^20.19.39",
         "eslint": "^8.57.1",
         "source-map-support": "^0.5.21",
-        "typescript": "~5.2.2"
+        "typescript": "~5.9.3"
       },
       "engines": {
         "node": "20 || 22 || 24"
@@ -488,7 +488,7 @@
         "@loopback/testlab": "^8.0.11",
         "@types/node": "^20.19.39",
         "eslint": "^8.57.1",
-        "typescript": "~5.2.2"
+        "typescript": "~5.9.3"
       },
       "engines": {
         "node": "20 || 22 || 24"
@@ -532,7 +532,7 @@
         "@types/express": "^4.17.25",
         "@types/node": "^20.19.39",
         "eslint": "^8.57.1",
-        "typescript": "~5.2.2"
+        "typescript": "~5.9.3"
       },
       "engines": {
         "node": "20 || 22 || 24"
@@ -575,7 +575,7 @@
         "@types/multer": "^2.1.0",
         "@types/node": "^20.19.39",
         "eslint": "^8.57.1",
-        "typescript": "~5.2.2"
+        "typescript": "~5.9.3"
       },
       "engines": {
         "node": "20 || 22 || 24"
@@ -622,7 +622,7 @@
         "graphql-ws": "^5.16.2",
         "rimraf": "^5.0.10",
         "source-map-support": "^0.5.21",
-        "typescript": "~5.2.2"
+        "typescript": "~5.9.3"
       },
       "engines": {
         "node": "20 || 22 || 24"
@@ -662,7 +662,7 @@
         "@types/debug": "4.1.13",
         "@types/node": "^20.19.39",
         "eslint": "^8.57.1",
-        "typescript": "~5.2.2"
+        "typescript": "~5.9.3"
       },
       "engines": {
         "node": "20 || 22 || 24"
@@ -705,7 +705,7 @@
         "@types/debug": "4.1.13",
         "@types/node": "^20.19.39",
         "eslint": "^8.57.1",
-        "typescript": "~5.2.2"
+        "typescript": "~5.9.3"
       },
       "engines": {
         "node": "20 || 22 || 24"
@@ -743,7 +743,7 @@
         "@loopback/testlab": "^8.0.11",
         "@types/node": "^20.19.39",
         "eslint": "^8.57.1",
-        "typescript": "~5.2.2"
+        "typescript": "~5.9.3"
       },
       "engines": {
         "node": "20 || 22 || 24"
@@ -795,7 +795,7 @@
         "eslint": "^8.57.1",
         "lodash": "^4.18.1",
         "should": "^13.2.3",
-        "typescript": "~5.2.2"
+        "typescript": "~5.9.3"
       },
       "engines": {
         "node": "20 || 22 || 24"
@@ -836,7 +836,7 @@
         "@types/debug": "^4.1.13",
         "@types/node": "^20.19.39",
         "eslint": "^8.57.1",
-        "typescript": "~5.2.2"
+        "typescript": "~5.9.3"
       },
       "engines": {
         "node": "20 || 22 || 24"
@@ -876,7 +876,7 @@
         "@loopback/testlab": "^8.0.11",
         "@types/node": "^20.19.39",
         "eslint": "^8.57.1",
-        "typescript": "~5.2.2"
+        "typescript": "~5.9.3"
       },
       "engines": {
         "node": "20 || 22 || 24"
@@ -923,7 +923,7 @@
         "@types/node": "^20.19.39",
         "eslint": "^8.57.1",
         "source-map-support": "^0.5.21",
-        "typescript": "~5.2.2"
+        "typescript": "~5.9.3"
       },
       "engines": {
         "node": "20 || 22 || 24"
@@ -1001,7 +1001,7 @@
         "axios": "^1.15.0",
         "eslint": "^8.57.1",
         "lodash": "^4.18.1",
-        "typescript": "~5.2.2"
+        "typescript": "~5.9.3"
       },
       "engines": {
         "node": "20 || 22 || 24"
@@ -1047,7 +1047,7 @@
         "@types/node": "^20.19.39",
         "eslint": "^8.57.1",
         "lodash": "^4.18.1",
-        "typescript": "~5.2.2"
+        "typescript": "~5.9.3"
       },
       "engines": {
         "node": "20 || 22 || 24"
@@ -1093,7 +1093,7 @@
         "@types/node": "^20.19.39",
         "eslint": "^8.57.1",
         "lodash": "^4.18.1",
-        "typescript": "~5.2.2"
+        "typescript": "~5.9.3"
       },
       "engines": {
         "node": "20 || 22 || 24"
@@ -1132,7 +1132,7 @@
         "@types/express": "^4.17.25",
         "@types/node": "^20.19.39",
         "eslint": "^8.57.1",
-        "typescript": "~5.2.2"
+        "typescript": "~5.9.3"
       },
       "engines": {
         "node": "20 || 22 || 24"
@@ -1178,7 +1178,7 @@
         "eslint": "^8.57.1",
         "mocha": "^11.7.5",
         "source-map-support": "^0.5.21",
-        "typescript": "~5.2.2"
+        "typescript": "~5.9.3"
       },
       "engines": {
         "node": "20 || 22 || 24"
@@ -1224,7 +1224,7 @@
         "eslint": "^8.57.1",
         "socket.io-client": "^4.8.3",
         "source-map-support": "^0.5.21",
-        "typescript": "~5.2.2"
+        "typescript": "~5.9.3"
       },
       "engines": {
         "node": "20 || 22 || 24"
@@ -1272,7 +1272,7 @@
         "@types/node": "^20.19.39",
         "eslint": "^8.57.1",
         "lodash": "^4.18.1",
-        "typescript": "~5.2.2"
+        "typescript": "~5.9.3"
       },
       "engines": {
         "node": "20 || 22 || 24"
@@ -1305,7 +1305,7 @@
         "@types/node": "^20.19.39",
         "eslint": "^8.57.1",
         "lodash": "^4.18.1",
-        "typescript": "~5.2.2"
+        "typescript": "~5.9.3"
       },
       "engines": {
         "node": "20 || 22 || 24"
@@ -1351,7 +1351,7 @@
         "@types/node": "^20.19.39",
         "eslint": "^8.57.1",
         "lodash": "^4.18.1",
-        "typescript": "~5.2.2"
+        "typescript": "~5.9.3"
       },
       "engines": {
         "node": "20 || 22 || 24"
@@ -1412,7 +1412,7 @@
         "@types/node": "^20.19.39",
         "eslint": "^8.57.1",
         "source-map-support": "^0.5.21",
-        "typescript": "~5.2.2"
+        "typescript": "~5.9.3"
       },
       "engines": {
         "node": "20 || 22 || 24"
@@ -1454,7 +1454,7 @@
         "events": "^3.3.0",
         "process": "^0.11.10",
         "puppeteer": "^24.40.0",
-        "typescript": "~5.2.2",
+        "typescript": "~5.9.3",
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@@ -1545,7 +1545,7 @@
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@@ -1920,7 +1920,7 @@
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+        "typescript": "~5.9.3"
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@@ -1967,7 +1967,7 @@
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@@ -5070,19 +5070,6 @@
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-      "optional": true,
-      "peer": true
+      "optional": true
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-      "optional": true,
-      "peer": true
+      "optional": true
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@@ -32723,7 +32704,6 @@
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@@ -32798,7 +32775,6 @@
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-      "dev": true,
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@@ -32813,14 +32789,12 @@
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-      "dev": true,
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-      "dev": true,
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@@ -32833,7 +32807,6 @@
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-      "dev": true,
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@@ -32861,7 +32834,6 @@
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-      "dev": true,
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@@ -32874,7 +32846,6 @@
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-      "dev": true,
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@@ -32887,7 +32858,6 @@
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-      "dev": true,
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@@ -32905,7 +32875,6 @@
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-      "dev": true,
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@@ -32918,7 +32887,6 @@
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-      "dev": true,
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@@ -32943,7 +32911,6 @@
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-      "dev": true,
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@@ -32959,7 +32926,6 @@
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-      "dev": true,
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@@ -32975,7 +32941,6 @@
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-      "dev": true,
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@@ -32990,7 +32955,6 @@
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-      "dev": true,
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@@ -33003,7 +32967,6 @@
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-      "dev": true,
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@@ -33013,7 +32976,6 @@
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-      "dev": true,
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@@ -33023,7 +32985,6 @@
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-      "dev": true,
       "optional": true,
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@@ -35733,9 +35694,10 @@
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-      "version": "5.2.2",
-      "resolved": "https://registry.npmjs.org/typescript/-/typescript-5.2.2.tgz",
-      "integrity": "sha512-mI4WrpHsbCIcwT9cF4FZvr80QUeKvsUsUvKDoR+X/7XHQH98xYD8YHZg7ANtz2GtZt/CBq2QJ0thkGJMHfqc1w==",
+      "version": "5.9.3",
+      "resolved": "https://registry.npmjs.org/typescript/-/typescript-5.9.3.tgz",
+      "integrity": "sha512-jl1vZzPDinLr9eUt3J/t7V6FgNEw9QjvBPdysz9KfQDD41fQrC2Y4vKQdiaUpFT4bXlb1RHhLpp8wtm6M5TgSw==",
+      "license": "Apache-2.0",
       "bin": {
         "tsc": "bin/tsc",
         "tsserver": "bin/tsserver"
@@ -39019,7 +38981,7 @@
         "prettier": "^3.8.2",
         "rimraf": "^5.0.10",
         "source-map-support": "^0.5.21",
-        "typescript": "~5.2.2"
+        "typescript": "~5.9.3"
       },
       "bin": {
         "lb-clean": "bin/run-clean.js",
@@ -39129,7 +39091,7 @@
         "terminal-link": "^2.1.1",
         "tildify": "^2.0.0",
         "ts-morph": "^27.0.2",
-        "typescript": "~5.2.2",
+        "typescript": "~5.9.3",
         "untildify": "^6.0.0",
         "update-notifier": "^7.3.1",
         "url-slug": "^4.0.1",
@@ -40560,7 +40522,7 @@
         "@types/on-finished": "^2.3.5",
         "@types/toposort": "^2.0.7",
         "source-map-support": "^0.5.21",
-        "typescript": "~5.2.2"
+        "typescript": "~5.9.3"
       },
       "engines": {
         "node": "20 || 22 || 24"
@@ -40597,7 +40559,7 @@
         "@loopback/build": "^12.0.11",
         "@loopback/testlab": "^8.0.11",
         "@types/node": "^20.19.39",
-        "typescript": "~5.2.2"
+        "typescript": "~5.9.3"
       },
       "engines": {
         "node": "20 || 22 || 24"
diff --git a/package.json b/package.json
index 9cee2795e358..eac695323541 100644
--- a/package.json
+++ b/package.json
@@ -71,7 +71,7 @@
     "mem-fs-editor": "^9.7.0",
     "open-cli": "^8.0.0",
     "prettier": "^3.8.2",
-    "typescript": "~5.2.2"
+    "typescript": "~5.9.3"
   },
   "engineStrict": true,
   "engines": {
diff --git a/packages/build/package.json b/packages/build/package.json
index 0e5a89e47505..c01d4cfab079 100644
--- a/packages/build/package.json
+++ b/packages/build/package.json
@@ -45,6 +45,6 @@
     "prettier": "^3.8.2",
     "rimraf": "^5.0.10",
     "source-map-support": "^0.5.21",
-    "typescript": "~5.2.2"
+    "typescript": "~5.9.3"
   }
 }
diff --git a/packages/cli/package.json b/packages/cli/package.json
index 8407a00d272f..e40c6c44ed7a 100644
--- a/packages/cli/package.json
+++ b/packages/cli/package.json
@@ -73,7 +73,7 @@
     "terminal-link": "^2.1.1",
     "tildify": "^2.0.0",
     "ts-morph": "^27.0.2",
-    "typescript": "~5.2.2",
+    "typescript": "~5.9.3",
     "untildify": "^6.0.0",
     "update-notifier": "^7.3.1",
     "url-slug": "^4.0.1",
diff --git a/packages/express/package.json b/packages/express/package.json
index 99d8ba618253..91113b4d4942 100644
--- a/packages/express/package.json
+++ b/packages/express/package.json
@@ -62,6 +62,6 @@
     "@types/on-finished": "^2.3.5",
     "@types/toposort": "^2.0.7",
     "source-map-support": "^0.5.21",
-    "typescript": "~5.2.2"
+    "typescript": "~5.9.3"
   }
 }
diff --git a/packages/filter/package.json b/packages/filter/package.json
index 5f5a0e5325a9..0efb2ca21f37 100644
--- a/packages/filter/package.json
+++ b/packages/filter/package.json
@@ -38,6 +38,6 @@
     "@loopback/build": "^12.0.11",
     "@loopback/testlab": "^8.0.11",
     "@types/node": "^20.19.39",
-    "typescript": "~5.2.2"
+    "typescript": "~5.9.3"
   }
 }