diff --git a/package-lock.json b/package-lock.json
index ae73ef3..bee84b3 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -2296,7 +2296,8 @@
         "ansi-regex": {
           "version": "2.1.1",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "aproba": {
           "version": "1.2.0",
@@ -2711,7 +2712,8 @@
         "safe-buffer": {
           "version": "5.1.2",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "safer-buffer": {
           "version": "2.1.2",
@@ -2767,6 +2769,7 @@
           "version": "3.0.1",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "ansi-regex": "^2.0.0"
           }
@@ -2810,12 +2813,14 @@
         "wrappy": {
           "version": "1.0.2",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "yallist": {
           "version": "3.0.3",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         }
       }
     },
@@ -3794,9 +3799,9 @@
       }
     },
     "lolex": {
-      "version": "3.1.0",
-      "resolved": "https://registry.npmjs.org/lolex/-/lolex-3.1.0.tgz",
-      "integrity": "sha512-zFo5MgCJ0rZ7gQg69S4pqBsLURbFw11X68C18OcJjJQbqaXm2NoTrGl1IMM3TIz0/BnN1tIs2tzmmqvCsOMMjw==",
+      "version": "4.0.1",
+      "resolved": "https://registry.npmjs.org/lolex/-/lolex-4.0.1.tgz",
+      "integrity": "sha512-UHuOBZ5jjsKuzbB/gRNNW8Vg8f00Emgskdq2kvZxgBJCS0aqquAuXai/SkWORlKeZEiNQWZjFZOqIUcH9LqKCw==",
       "dev": true
     },
     "lowercase-keys": {
@@ -5554,6 +5559,12 @@
         "supports-color": "^5.5.0"
       },
       "dependencies": {
+        "lolex": {
+          "version": "3.1.0",
+          "resolved": "https://registry.npmjs.org/lolex/-/lolex-3.1.0.tgz",
+          "integrity": "sha512-zFo5MgCJ0rZ7gQg69S4pqBsLURbFw11X68C18OcJjJQbqaXm2NoTrGl1IMM3TIz0/BnN1tIs2tzmmqvCsOMMjw==",
+          "dev": true
+        },
         "supports-color": {
           "version": "5.5.0",
           "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-5.5.0.tgz",
diff --git a/package.json b/package.json
index 7a03df1..06dcfb4 100644
--- a/package.json
+++ b/package.json
@@ -23,7 +23,7 @@
     "concurrently": "^4.1.0",
     "glob": "^7.1.3",
     "istanbul": "^0.4.5",
-    "lolex": "^3.1.0",
+    "lolex": "^4.0.1",
     "mkdirp": "^0.5.1",
     "mocha": "^6.1.3",
     "mocha-headless-chrome": "^2.0.2",