diff --git a/package-lock.json b/package-lock.json
index 1a6695ce17d..1f7ac4c2ca1 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -33,7 +33,7 @@
         "@sentry/opentelemetry": "^10.34.0",
         "@stripe/stripe-js": "^9.7.0",
         "@types/jsdom": "^28.0.3",
-        "@types/node": "^25.3.5",
+        "@types/node": "^26.4.1",
         "@types/react": "19.2.17",
         "@types/react-dom": "19.2.3",
         "canvas-confetti": "^1.9.4",
@@ -13141,12 +13141,12 @@
       }
     },
     "node_modules/@types/node": {
-      "version": "25.3.5",
-      "resolved": "https://registry.npmjs.org/@types/node/-/node-25.3.5.tgz",
-      "integrity": "sha512-oX8xrhvpiyRCQkG1MFchB09f+cXftgIXb3a7UUa4Y3wpmZPw5tyZGTLWhlESOLq1Rq6oDlc8npVU2/9xiCuXMA==",
+      "version": "26.4.1",
+      "resolved": "https://registry.npmjs.org/@types/node/-/node-26.4.1.tgz",
+      "integrity": "sha512-k97ENvZWtvA6yqz5/FS6a7duDgOPEeOQOc2iKS/nY6mX6qJUKtLnWzQS+Xj6tXweyj6ZcTAK2Qecetnvi9nCLA==",
       "license": "MIT",
       "dependencies": {
-        "undici-types": "~7.18.0"
+        "undici-types": "~8.3.0"
       }
     },
     "node_modules/@types/nodemailer": {
@@ -28602,9 +28602,9 @@
       }
     },
     "node_modules/undici-types": {
-      "version": "7.18.2",
-      "resolved": "https://registry.npmjs.org/undici-types/-/undici-types-7.18.2.tgz",
-      "integrity": "sha512-AsuCzffGHJybSaRrmr5eHr81mwJU3kjw6M+uprWvCXiNeN9SOGwQ3Jn8jb8m3Z6izVgknn1R0FTCEAP2QrLY/w==",
+      "version": "8.3.0",
+      "resolved": "https://registry.npmjs.org/undici-types/-/undici-types-8.3.0.tgz",
+      "integrity": "sha512-j375ScV60dom+YkPFIfTLcOiPxkN/buHz5GobjLhixFuANaNs3C9l4GmrWqejgXWJ7BbJcFYpTEUkS1Ge8bpZQ==",
       "license": "MIT"
     },
     "node_modules/unicode-canonical-property-names-ecmascript": {
diff --git a/package.json b/package.json
index 083f5fb2675..58c00291356 100644
--- a/package.json
+++ b/package.json
@@ -83,7 +83,7 @@
     "@sentry/opentelemetry": "^10.34.0",
     "@stripe/stripe-js": "^9.7.0",
     "@types/jsdom": "^28.0.3",
-    "@types/node": "^25.3.5",
+    "@types/node": "^26.4.1",
     "@types/react": "19.2.17",
     "@types/react-dom": "19.2.3",
     "canvas-confetti": "^1.9.4",
diff --git a/src/app/api/utils/mockUtils.ts b/src/app/api/utils/mockUtils.ts
index b8842633dfb..09429ece9f5 100644
--- a/src/app/api/utils/mockUtils.ts
+++ b/src/app/api/utils/mockUtils.ts
@@ -2,12 +2,11 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
-import { BinaryLike } from "crypto";
 import { getSha1 } from "../../../utils/fxa";
 import { logger } from "../../functions/server/logging";
 
 export function emailHashPrefix(email: string) {
-  return getSha1(email as BinaryLike)
+  return getSha1(email)
     .slice(0, 6)
     .toUpperCase();
 }
diff --git a/src/utils/fxa.ts b/src/utils/fxa.ts
index e07a4a8d635..e3d6f60b525 100644
--- a/src/utils/fxa.ts
+++ b/src/utils/fxa.ts
@@ -226,7 +226,7 @@ async function getAttachedClients(
 
 // TODO: Add unit test when changing this code:
 /* c8 ignore next 3 */
-function getSha1(email: crypto.BinaryLike) {
+function getSha1(email: string) {
   return crypto.createHash("sha1").update(email).digest("hex");
 }