diff --git a/glean/package-lock.json b/glean/package-lock.json
index 57dfae06d..9543c7e85 100644
--- a/glean/package-lock.json
+++ b/glean/package-lock.json
@@ -50,7 +50,7 @@
         "ts-loader": "^9.0.1",
         "ts-mocha": "^10.0.0",
         "ts-node": "^10.8.0",
-        "typescript": "^4.3.5",
+        "typescript": "^5.9.2",
         "web-ext-types": "^3.2.1",
         "webpack": "^5.42.1",
         "webpack-cli": "^5.0.1"
@@ -2173,19 +2173,6 @@
         "node": ">=14"
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-    "node_modules/dependency-tree/node_modules/typescript": {
-      "version": "5.4.5",
-      "resolved": "https://registry.npmjs.org/typescript/-/typescript-5.4.5.tgz",
-      "integrity": "sha512-vcI4UpRgg81oIRUFwR0WSIHKt11nJ7SAVlYNIu+QpqeyXP+gpQJy/Z4+F0aGxSE4MqwjyXvW/TzgkLAx2AGHwQ==",
-      "dev": true,
-      "bin": {
-        "tsc": "bin/tsc",
-        "tsserver": "bin/tsserver"
-      },
-      "engines": {
-        "node": ">=14.17"
-      }
-    },
     "node_modules/detective-amd": {
       "version": "5.0.2",
       "resolved": "https://registry.npmjs.org/detective-amd/-/detective-amd-5.0.2.tgz",
@@ -2350,19 +2337,6 @@
         "url": "https://opencollective.com/typescript-eslint"
       }
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-    "node_modules/detective-typescript/node_modules/typescript": {
-      "version": "5.4.5",
-      "resolved": "https://registry.npmjs.org/typescript/-/typescript-5.4.5.tgz",
-      "integrity": "sha512-vcI4UpRgg81oIRUFwR0WSIHKt11nJ7SAVlYNIu+QpqeyXP+gpQJy/Z4+F0aGxSE4MqwjyXvW/TzgkLAx2AGHwQ==",
-      "dev": true,
-      "bin": {
-        "tsc": "bin/tsc",
-        "tsserver": "bin/tsserver"
-      },
-      "engines": {
-        "node": ">=14.17"
-      }
-    },
     "node_modules/diff": {
       "version": "5.0.0",
       "integrity": "sha512-/VTCrvm5Z0JGty/BWHljh+BAiw3IK+2j87NGMu8Nwc/f48WoDAC395uomO9ZD117ZOBaHmkX1oyLvkVM/aIT3w==",
@@ -3318,19 +3292,6 @@
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-    "node_modules/filing-cabinet/node_modules/typescript": {
-      "version": "5.4.5",
-      "resolved": "https://registry.npmjs.org/typescript/-/typescript-5.4.5.tgz",
-      "integrity": "sha512-vcI4UpRgg81oIRUFwR0WSIHKt11nJ7SAVlYNIu+QpqeyXP+gpQJy/Z4+F0aGxSE4MqwjyXvW/TzgkLAx2AGHwQ==",
-      "dev": true,
-      "bin": {
-        "tsc": "bin/tsc",
-        "tsserver": "bin/tsserver"
-      },
-      "engines": {
-        "node": ">=14.17"
-      }
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     "node_modules/fill-range": {
       "version": "7.1.1",
       "resolved": "https://registry.npmjs.org/fill-range/-/fill-range-7.1.1.tgz",
@@ -7559,16 +7520,17 @@
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-      "version": "4.9.5",
-      "resolved": "https://registry.npmjs.org/typescript/-/typescript-4.9.5.tgz",
-      "integrity": "sha512-1FXk9E2Hm+QzZQ7z+McJiHL4NW1F2EzMu9Nq9i3zAaGqibafqYwCVU6WyWAuyQRRzOlxou8xZSyXLEN8oKj24g==",
+      "version": "5.9.2",
+      "resolved": "https://registry.npmjs.org/typescript/-/typescript-5.9.2.tgz",
+      "integrity": "sha512-CWBzXQrc/qOkhidw1OzBTQuYRbfyxDXJMVJ1XNwUHGROVmuaeiEm3OslpZ1RV96d7SKKjZKrSJu3+t/xlw3R9A==",
       "dev": true,
+      "license": "Apache-2.0",
       "bin": {
         "tsc": "bin/tsc",
         "tsserver": "bin/tsserver"
       },
       "engines": {
-        "node": ">=4.2.0"
+        "node": ">=14.17"
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     "node_modules/unbox-primitive": {
@@ -9714,12 +9676,6 @@
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           "dev": true
-        },
-        "typescript": {
-          "version": "5.4.5",
-          "resolved": "https://registry.npmjs.org/typescript/-/typescript-5.4.5.tgz",
-          "integrity": "sha512-vcI4UpRgg81oIRUFwR0WSIHKt11nJ7SAVlYNIu+QpqeyXP+gpQJy/Z4+F0aGxSE4MqwjyXvW/TzgkLAx2AGHwQ==",
-          "dev": true
         }
       }
     },
@@ -9833,12 +9789,6 @@
             "@typescript-eslint/types": "5.62.0",
             "eslint-visitor-keys": "^3.3.0"
           }
-        },
-        "typescript": {
-          "version": "5.4.5",
-          "resolved": "https://registry.npmjs.org/typescript/-/typescript-5.4.5.tgz",
-          "integrity": "sha512-vcI4UpRgg81oIRUFwR0WSIHKt11nJ7SAVlYNIu+QpqeyXP+gpQJy/Z4+F0aGxSE4MqwjyXvW/TzgkLAx2AGHwQ==",
-          "dev": true
         }
       }
     },
@@ -10574,12 +10524,6 @@
             "minimist": "^1.2.6",
             "strip-bom": "^3.0.0"
           }
-        },
-        "typescript": {
-          "version": "5.4.5",
-          "resolved": "https://registry.npmjs.org/typescript/-/typescript-5.4.5.tgz",
-          "integrity": "sha512-vcI4UpRgg81oIRUFwR0WSIHKt11nJ7SAVlYNIu+QpqeyXP+gpQJy/Z4+F0aGxSE4MqwjyXvW/TzgkLAx2AGHwQ==",
-          "dev": true
         }
       }
     },
@@ -13633,9 +13577,9 @@
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     },
     "typescript": {
-      "version": "4.9.5",
-      "resolved": "https://registry.npmjs.org/typescript/-/typescript-4.9.5.tgz",
-      "integrity": "sha512-1FXk9E2Hm+QzZQ7z+McJiHL4NW1F2EzMu9Nq9i3zAaGqibafqYwCVU6WyWAuyQRRzOlxou8xZSyXLEN8oKj24g==",
+      "version": "5.9.2",
+      "resolved": "https://registry.npmjs.org/typescript/-/typescript-5.9.2.tgz",
+      "integrity": "sha512-CWBzXQrc/qOkhidw1OzBTQuYRbfyxDXJMVJ1XNwUHGROVmuaeiEm3OslpZ1RV96d7SKKjZKrSJu3+t/xlw3R9A==",
       "dev": true
     },
     "unbox-primitive": {
diff --git a/glean/package.json b/glean/package.json
index 6ef472206..4cae607db 100644
--- a/glean/package.json
+++ b/glean/package.json
@@ -117,7 +117,7 @@
     "ts-loader": "^9.0.1",
     "ts-mocha": "^10.0.0",
     "ts-node": "^10.8.0",
-    "typescript": "^4.3.5",
+    "typescript": "^5.9.2",
     "web-ext-types": "^3.2.1",
     "webpack": "^5.42.1",
     "webpack-cli": "^5.0.1"