diff --git a/mock-es-module/package-lock.json b/mock-es-module/package-lock.json
index f57ff0ac9..0d89c8c3c 100644
--- a/mock-es-module/package-lock.json
+++ b/mock-es-module/package-lock.json
@@ -484,9 +484,9 @@
       }
     },
     "@sinonjs/fake-timers": {
-      "version": "10.3.0",
-      "resolved": "https://registry.npmjs.org/@sinonjs/fake-timers/-/fake-timers-10.3.0.tgz",
-      "integrity": "sha512-V4BG07kuYSUkTCSBHG8G8TNhM+F19jXFWnQtzj+we8DrkpSBCee9Z3Ms8yiGer/dlmhe35/Xdgyo3/0rQKg7YA==",
+      "version": "11.2.2",
+      "resolved": "https://registry.npmjs.org/@sinonjs/fake-timers/-/fake-timers-11.2.2.tgz",
+      "integrity": "sha512-G2piCSxQ7oWOxwGSAyFHfPIsyeJGXYtc6mFbnFA+kRXkiEnTl8c/8jul2S329iFBnDI9HGoeWWAZvuvOkZccgw==",
       "dev": true,
       "requires": {
         "@sinonjs/commons": "^3.0.0"
@@ -3347,9 +3347,9 @@
       "dev": true
     },
     "nise": {
-      "version": "5.1.9",
-      "resolved": "https://registry.npmjs.org/nise/-/nise-5.1.9.tgz",
-      "integrity": "sha512-qOnoujW4SV6e40dYxJOb3uvuoPHtmLzIk4TFo+j0jPJoC+5Z9xja5qH5JZobEPsa8+YYphMrOSwnrshEhG2qww==",
+      "version": "6.0.0",
+      "resolved": "https://registry.npmjs.org/nise/-/nise-6.0.0.tgz",
+      "integrity": "sha512-K8ePqo9BFvN31HXwEtTNGzgrPpmvgciDsFz8aztFjt4LqKO/JeFD8tBOeuDiCMXrIl/m1YvfH8auSpxfaD09wg==",
       "dev": true,
       "requires": {
         "@sinonjs/commons": "^3.0.0",
@@ -3367,15 +3367,6 @@
           "requires": {
             "type-detect": "4.0.8"
           }
-        },
-        "@sinonjs/fake-timers": {
-          "version": "11.2.2",
-          "resolved": "https://registry.npmjs.org/@sinonjs/fake-timers/-/fake-timers-11.2.2.tgz",
-          "integrity": "sha512-G2piCSxQ7oWOxwGSAyFHfPIsyeJGXYtc6mFbnFA+kRXkiEnTl8c/8jul2S329iFBnDI9HGoeWWAZvuvOkZccgw==",
-          "dev": true,
-          "requires": {
-            "@sinonjs/commons": "^3.0.0"
-          }
         }
       }
     },
@@ -3993,17 +3984,17 @@
       "dev": true
     },
     "sinon": {
-      "version": "15.2.0",
-      "resolved": "https://registry.npmjs.org/sinon/-/sinon-15.2.0.tgz",
-      "integrity": "sha512-nPS85arNqwBXaIsFCkolHjGIkFo+Oxu9vbgmBJizLAhqe6P2o3Qmj3KCUoRkfhHtvgDhZdWD3risLHAUJ8npjw==",
+      "version": "18.0.0",
+      "resolved": "https://registry.npmjs.org/sinon/-/sinon-18.0.0.tgz",
+      "integrity": "sha512-+dXDXzD1sBO6HlmZDd7mXZCR/y5ECiEiGCBSGuFD/kZ0bDTofPYc6JaeGmPSF+1j1MejGUWkORbYOLDyvqCWpA==",
       "dev": true,
       "requires": {
-        "@sinonjs/commons": "^3.0.0",
-        "@sinonjs/fake-timers": "^10.3.0",
+        "@sinonjs/commons": "^3.0.1",
+        "@sinonjs/fake-timers": "^11.2.2",
         "@sinonjs/samsam": "^8.0.0",
-        "diff": "^5.1.0",
-        "nise": "^5.1.4",
-        "supports-color": "^7.2.0"
+        "diff": "^5.2.0",
+        "nise": "^6.0.0",
+        "supports-color": "^7"
       },
       "dependencies": {
         "@sinonjs/commons": {
diff --git a/mock-es-module/package.json b/mock-es-module/package.json
index e46c9a2ca..74d71490c 100644
--- a/mock-es-module/package.json
+++ b/mock-es-module/package.json
@@ -14,6 +14,6 @@
     "@web/dev-server": "0.4.5",
     "@web/dev-server-import-maps": "0.2.1",
     "@web/test-runner": "0.16.0",
-    "sinon": "15.2.0"
+    "sinon": "18.0.0"
   }
 }