diff --git a/package-lock.json b/package-lock.json
index 5d6cea5157..af3403460b 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "firebase-admin",
-  "version": "13.4.0",
+  "version": "13.5.0",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "firebase-admin",
-      "version": "13.4.0",
+      "version": "13.5.0",
       "license": "Apache-2.0",
       "dependencies": {
         "@fastify/busboy": "^3.0.0",
@@ -39,7 +39,7 @@
         "@types/request": "^2.47.0",
         "@types/request-promise": "^4.1.41",
         "@types/sinon": "^17.0.2",
-        "@types/sinon-chai": "^3.0.0",
+        "@types/sinon-chai": "^4.0.0",
         "@types/uuid": "^10.0.0",
         "@typescript-eslint/eslint-plugin": "^7.16.1",
         "@typescript-eslint/parser": "^7.16.1",
@@ -68,7 +68,7 @@
         "request-promise": "^4.1.1",
         "run-sequence": "^2.2.1",
         "sinon": "^18.0.0",
-        "sinon-chai": "^3.0.0",
+        "sinon-chai": "^4.0.1",
         "ts-node": "^10.2.0",
         "typescript": "5.5.4",
         "yargs": "^17.0.1"
@@ -2247,9 +2247,9 @@
       }
     },
     "node_modules/@types/sinon-chai": {
-      "version": "3.2.12",
-      "resolved": "https://registry.npmjs.org/@types/sinon-chai/-/sinon-chai-3.2.12.tgz",
-      "integrity": "sha512-9y0Gflk3b0+NhQZ/oxGtaAJDvRywCa5sIyaVnounqLvmf93yBF4EgIRspePtkMs3Tr844nCclYMlcCNmLCvjuQ==",
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/@types/sinon-chai/-/sinon-chai-4.0.0.tgz",
+      "integrity": "sha512-Uar+qk3TmeFsUWCwtqRNqNUE7vf34+MCJiQJR5M2rd4nCbhtE8RgTiHwN/mVwbfCjhmO6DiOel/MgzHkRMJJFg==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
@@ -10800,13 +10800,13 @@
       }
     },
     "node_modules/sinon-chai": {
-      "version": "3.7.0",
-      "resolved": "https://registry.npmjs.org/sinon-chai/-/sinon-chai-3.7.0.tgz",
-      "integrity": "sha512-mf5NURdUaSdnatJx3uhoBOrY9dtL19fiOtAdT1Azxg3+lNJFiuN0uzaU3xX1LeAfL17kHQhTAJgpsfhbMJMY2g==",
+      "version": "4.0.1",
+      "resolved": "https://registry.npmjs.org/sinon-chai/-/sinon-chai-4.0.1.tgz",
+      "integrity": "sha512-xMKEEV3cYHC1G+boyr7QEqi80gHznYsxVdC9CdjP5JnCWz/jPGuXQzJz3PtBcb0CcHAxar15Y5sjLBoAs6a0yA==",
       "dev": true,
       "license": "(BSD-2-Clause OR WTFPL)",
       "peerDependencies": {
-        "chai": "^4.0.0",
+        "chai": "^5.0.0 || ^6.0.0",
         "sinon": ">=4.0.0"
       }
     },
diff --git a/package.json b/package.json
index ffd2a8da9e..0588534e26 100644
--- a/package.json
+++ b/package.json
@@ -238,7 +238,7 @@
     "@types/request": "^2.47.0",
     "@types/request-promise": "^4.1.41",
     "@types/sinon": "^17.0.2",
-    "@types/sinon-chai": "^3.0.0",
+    "@types/sinon-chai": "^4.0.0",
     "@types/uuid": "^10.0.0",
     "@typescript-eslint/eslint-plugin": "^7.16.1",
     "@typescript-eslint/parser": "^7.16.1",
@@ -267,7 +267,7 @@
     "request-promise": "^4.1.1",
     "run-sequence": "^2.2.1",
     "sinon": "^18.0.0",
-    "sinon-chai": "^3.0.0",
+    "sinon-chai": "^4.0.1",
     "ts-node": "^10.2.0",
     "typescript": "5.5.4",
     "yargs": "^17.0.1"