diff --git a/faucet/authenticator/package-lock.json b/faucet/authenticator/package-lock.json
index e65683a5d..17428aa25 100644
--- a/faucet/authenticator/package-lock.json
+++ b/faucet/authenticator/package-lock.json
@@ -25,7 +25,7 @@
         "mocha": "^11.0.1",
         "nodemon": "^3.0.1",
         "sinon": "^19.0.2",
-        "sinon-chai": "^3.7.0",
+        "sinon-chai": "^4.0.0",
         "supertest": "^7.0.0"
       }
     },
@@ -4544,12 +4544,13 @@
       }
     },
     "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": "4.0.0",
+      "resolved": "https://registry.npmjs.org/sinon-chai/-/sinon-chai-4.0.0.tgz",
+      "integrity": "sha512-cWqO7O2I4XfJDWyWElAQ9D/dtdh5Mo0RHndsfiiYyjWnlPzBJdIvjCVURO4EjyYaC3BjV+ISNXCfTXPXTEIEWA==",
       "dev": true,
+      "license": "(BSD-2-Clause OR WTFPL)",
       "peerDependencies": {
-        "chai": "^4.0.0",
+        "chai": "^5.0.0",
         "sinon": ">=4.0.0"
       }
     },
@@ -8782,9 +8783,9 @@
       }
     },
     "sinon-chai": {
-      "version": "3.7.0",
-      "resolved": "https://registry.npmjs.org/sinon-chai/-/sinon-chai-3.7.0.tgz",
-      "integrity": "sha512-mf5NURdUaSdnatJx3uhoBOrY9dtL19fiOtAdT1Azxg3+lNJFiuN0uzaU3xX1LeAfL17kHQhTAJgpsfhbMJMY2g==",
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/sinon-chai/-/sinon-chai-4.0.0.tgz",
+      "integrity": "sha512-cWqO7O2I4XfJDWyWElAQ9D/dtdh5Mo0RHndsfiiYyjWnlPzBJdIvjCVURO4EjyYaC3BjV+ISNXCfTXPXTEIEWA==",
       "dev": true,
       "requires": {}
     },
diff --git a/faucet/authenticator/package.json b/faucet/authenticator/package.json
index 445221654..fc80ba18d 100644
--- a/faucet/authenticator/package.json
+++ b/faucet/authenticator/package.json
@@ -33,7 +33,7 @@
     "mocha": "^11.0.1",
     "nodemon": "^3.0.1",
     "sinon": "^19.0.2",
-    "sinon-chai": "^3.7.0",
+    "sinon-chai": "^4.0.0",
     "supertest": "^7.0.0"
   }
 }