diff --git a/src/microsoft-learn-mock/package-lock.json b/src/microsoft-learn-mock/package-lock.json
index 10dc81378..82a0e82c8 100644
--- a/src/microsoft-learn-mock/package-lock.json
+++ b/src/microsoft-learn-mock/package-lock.json
@@ -14,7 +14,7 @@
         "http-server": "14.1.1",
         "rollup": "2.75.6",
         "rollup-plugin-typescript2": "0.32.1",
-        "typescript": "4.7.3"
+        "typescript": "5.9.3"
       }
     },
     "node_modules/@rollup/plugin-commonjs": {
@@ -979,16 +979,17 @@
       "dev": true
     },
     "node_modules/typescript": {
-      "version": "4.7.3",
-      "resolved": "https://registry.npmjs.org/typescript/-/typescript-4.7.3.tgz",
-      "integrity": "sha512-WOkT3XYvrpXx4vMMqlD+8R8R37fZkjyLGlxavMc4iB8lrl8L0DeTcHbYgw/v0N/z9wAFsgBhcsF0ruoySS22mA==",
+      "version": "5.9.3",
+      "resolved": "https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet-public-npm/npm/registry/typescript/-/typescript-5.9.3.tgz",
+      "integrity": "sha1-W09Z4VMQqxeiFvXWz1PuR27eZw8=",
       "dev": true,
+      "license": "Apache-2.0",
       "bin": {
         "tsc": "bin/tsc",
         "tsserver": "bin/tsserver"
       },
       "engines": {
-        "node": ">=4.2.0"
+        "node": ">=14.17"
       }
     },
     "node_modules/union": {
@@ -1745,9 +1746,9 @@
       "dev": true
     },
     "typescript": {
-      "version": "4.7.3",
-      "resolved": "https://registry.npmjs.org/typescript/-/typescript-4.7.3.tgz",
-      "integrity": "sha512-WOkT3XYvrpXx4vMMqlD+8R8R37fZkjyLGlxavMc4iB8lrl8L0DeTcHbYgw/v0N/z9wAFsgBhcsF0ruoySS22mA==",
+      "version": "5.9.3",
+      "resolved": "https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet-public-npm/npm/registry/typescript/-/typescript-5.9.3.tgz",
+      "integrity": "sha1-W09Z4VMQqxeiFvXWz1PuR27eZw8=",
       "dev": true
     },
     "union": {
diff --git a/src/microsoft-learn-mock/package.json b/src/microsoft-learn-mock/package.json
index 3e24d7572..95ea8326c 100644
--- a/src/microsoft-learn-mock/package.json
+++ b/src/microsoft-learn-mock/package.json
@@ -15,7 +15,7 @@
     "@rollup/plugin-commonjs": "22.0.0",
     "@rollup/plugin-node-resolve": "13.3.0",
     "http-server": "14.1.1",
-    "typescript": "4.7.3",
+    "typescript": "5.9.3",
     "rollup": "2.75.6",
     "rollup-plugin-typescript2": "0.32.1"
   }